Power supply
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Posts: 46,084
I am designing a stamp driven data logging system that must operate for four
days on battery power. I have estimated that the system will draw 150mA. Is
there a viable way to power this unit for this period of time. Solar cells
are NOT a viable solution. Any reasonable suggestion would be appreciated.
I would appreciate a CC response to my e-mail address.
TIA
__________________________________________
Victor Fraenckel vfraenc1@n...
Home of the WindReader Electronic Theodolite
Read the WIND
days on battery power. I have estimated that the system will draw 150mA. Is
there a viable way to power this unit for this period of time. Solar cells
are NOT a viable solution. Any reasonable suggestion would be appreciated.
I would appreciate a CC response to my e-mail address.
TIA
__________________________________________
Victor Fraenckel vfraenc1@n...
Home of the WindReader Electronic Theodolite
Read the WIND
Comments
You need a 15A-hr battery.
Joseph F. Mibelli
Victorf wrote:
> I am designing a stamp driven data logging system that must operate for four
> days on battery power. I have estimated that the system will draw 150mA. Is
> there a viable way to power this unit for this period of time. Solar cells
> are NOT a viable solution. Any reasonable suggestion would be appreciated.
>
> I would appreciate a CC response to my e-mail address.
>
> TIA
> __________________________________________
>
> Victor Fraenckel vfraenc1@n...
> Home of the WindReader Electronic Theodolite
> Read the WIND
>I am designing a stamp driven data logging system that must operate for four
>days on battery power. I have estimated that the system will draw 150mA. Is
>there a viable way to power this unit for this period of time. Solar cells
>are NOT a viable solution. Any reasonable suggestion would be appreciated.
>
>I would appreciate a CC response to my e-mail address.
Victor -
If those are the only constraints, use a gel cel or sealed lead acid battery.
If size, cost, weight or other factors are important, those need to be stated
as well.
Bruce
>
>TIA
>__________________________________________
>
>Victor Fraenckel vfraenc1@n...
>Home of the WindReader Electronic Theodolite
> Read the WIND
>
>
>
>
>
>
>
In a BS2 application, I have a 9V 500mA (unreg.) adaptor
feeding a 5V regulator. I have the expected two stabalizing caps on the
regulator.
After about 2-10 minutes, the system--all logic loads, save
one inductive load<100mA--shuts down. After a brief unplugging, I find
the system works again. The logic/regulators are properly protected from
the inductive load.
Now: The open-circuit potential of the adaptor is 11.5V. When the
system shuts off, with the regulator still connected to load, I read 12.7V
from the adaptor.
How is this possible?
I am guessing the adaptor is malfunctioning (an older model from
several years); I would try another but have none available for a
few days. The stamp works fine otherwise.
Thank you for your time,
Paul
Is the regulator overheating? If so, it goes into thermal self-protection
mode where it may cycle on/off, ("burp mode"), which produces a pulsed load
on the power source. If this happens, the transient response of the adapter
may have voltage overshoots which are confusing your voltmeter. If you look
at input voltage to the regulator with a scope, the answer may be apparent.
Ray McArthur
From: Paul J. Csonka <csonka@e...>
To: <basicstamps@egroups.com>
Sent: Monday, October 30, 2000 1:33 AM
Subject: [noparse][[/noparse]basicstamps] Power Supply
>
> In a BS2 application, I have a 9V 500mA (unreg.) adaptor
> feeding a 5V regulator. I have the expected two stabalizing caps on the
> regulator.
>
> After about 2-10 minutes, the system--all logic loads, save
> one inductive load<100mA--shuts down. After a brief unplugging, I find
> the system works again. The logic/regulators are properly protected from
> the inductive load.
> Now: The open-circuit potential of the adaptor is 11.5V. When the
> system shuts off, with the regulator still connected to load, I read 12.7V
> from the adaptor.
>
> How is this possible?
The current from the regulator is well below its capacity, (1/3),
and I don't believe it's overheating. But it may be in such a way that I
can't tell...
I was looking at the potential with a scope to be sure; haven't
tried yet with a meter. So I believe the measurement is correct.
There seems to be a clear jump to 12.7V, no decay curves or
oscillations, etc.
Thanks for your help,
Paul
On Mon, 30 Oct 2000, Ray McArthur wrote:
> Paul:
> Is the regulator overheating? If so, it goes into thermal self-protection
> mode where it may cycle on/off, ("burp mode"), which produces a pulsed load
> on the power source. If this happens, the transient response of the adapter
> may have voltage overshoots which are confusing your voltmeter. If you look
> at input voltage to the regulator with a scope, the answer may be apparent.
>
> Ray McArthur
>
> From: Paul J. Csonka <csonka@e...>
> To: <basicstamps@egroups.com>
> Sent: Monday, October 30, 2000 1:33 AM
> Subject: [noparse][[/noparse]basicstamps] Power Supply
> >
> > In a BS2 application, I have a 9V 500mA (unreg.) adaptor
> > feeding a 5V regulator. I have the expected two stabalizing caps on the
> > regulator.
> >
> > After about 2-10 minutes, the system--all logic loads, save
> > one inductive load<100mA--shuts down. After a brief unplugging, I find
> > the system works again. The logic/regulators are properly protected from
> > the inductive load.
> > Now: The open-circuit potential of the adaptor is 11.5V. When the
> > system shuts off, with the regulator still connected to load, I read 12.7V
> > from the adaptor.
> >
> > How is this possible?
>
>
>
>
>
At one time we tested some TO-220 12 volt regulators in the overload mode.
In order to get them into shutdown, they had to get much too hot to hold
onto....so your regulators probably are not shutting down. Maybe your
theory about a defective adapter is correct?
Ray McArthur
Original Message
From: Paul J. Csonka <csonka@e...>
To: <basicstamps@egroups.com>
Sent: Monday, October 30, 2000 3:14 PM
Subject: Re: [noparse][[/noparse]basicstamps] Power Supply
> Hi Ray,
>
> The current from the regulator is well below its capacity, (1/3),
> and I don't believe it's overheating. But it may be in such a way that I
> can't tell...
>
> I was looking at the potential with a scope to be sure; haven't
> tried yet with a meter. So I believe the measurement is correct.
> There seems to be a clear jump to 12.7V, no decay curves or
> oscillations, etc.
>
> Thanks for your help
Could be the adaptor is ruined...(?), as you suggest.
But I have to say, this would be a rare occurance!
I get my lab supply back tomorrow, I will try with that. Until
then, the stamp gets a long nap.
Thank you for your help,
Paul
On Mon, 30 Oct 2000, Ray McArthur wrote:
> Hi Paul,
>
> At one time we tested some TO-220 12 volt regulators in the overload mode.
> In order to get them into shutdown, they had to get much too hot to hold
> onto....so your regulators probably are not shutting down. Maybe your
> theory about a defective adapter is correct?
>
> Ray McArthur
>
>
Original Message
> From: Paul J. Csonka <csonka@e...>
> To: <basicstamps@egroups.com>
> Sent: Monday, October 30, 2000 3:14 PM
> Subject: Re: [noparse][[/noparse]basicstamps] Power Supply
>
>
> > Hi Ray,
> >
> > The current from the regulator is well below its capacity, (1/3),
> > and I don't believe it's overheating. But it may be in such a way that I
> > can't tell...
> >
> > I was looking at the potential with a scope to be sure; haven't
> > tried yet with a meter. So I believe the measurement is correct.
> > There seems to be a clear jump to 12.7V, no decay curves or
> > oscillations, etc.
> >
> > Thanks for your help
>
>
>
>
>Good evening,
>
> In a BS2 application, I have a 9V 500mA (unreg.) adaptor
>feeding a 5V regulator. I have the expected two stabalizing caps on the
>regulator.
>
> After about 2-10 minutes, the system--all logic loads, save
>one inductive load<100mA--shuts down. After a brief unplugging, I find
>the system works again. The logic/regulators are properly protected from
>the inductive load.
> Now: The open-circuit potential of the adaptor is 11.5V. When the
>system shuts off, with the regulator still connected to load, I read 12.7V
>from the adaptor.
>
> How is this possible?
I think that you will find that the regulator is shutting down, or a bad
connection somewhere is opening. The clue is that the open circuit voltage
is so high. I don't see how the adapter could be the problem since it *IS*
putting out voltage (even though it is higher than you expect).
Measure the voltage into and coming out of the regulator. Look for bad
connections.
dwayne
Dwayne Reid <dwayner@p...>
Trinity Electronics Systems Ltd Edmonton, AB, CANADA
(780) 489-3199 voice (780) 487-6397 fax
Celebrating 16 years of Engineering Innovation (1984 - 2000)
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Do NOT send unsolicited commercial email to this email address.
This message neither grants consent to receive unsolicited
commercial email nor is intended to solicit commercial email.
On Mon, 30 Oct 2000, Dwayne Reid wrote:
> At 10:33 PM 10/29/00 -0800, Paul J. Csonka wrote:
>
> >Good evening,
> >
> > In a BS2 application, I have a 9V 500mA (unreg.) adaptor
> >feeding a 5V regulator. I have the expected two stabalizing caps on the
> >regulator.
> >
> > After about 2-10 minutes, the system--all logic loads, save
> >one inductive load<100mA--shuts down. After a brief unplugging, I find
> >the system works again. The logic/regulators are properly protected from
> >the inductive load.
> > Now: The open-circuit potential of the adaptor is 11.5V. When the
> >system shuts off, with the regulator still connected to load, I read 12.7V
> >from the adaptor.
> >
> > How is this possible?
>
> I think that you will find that the regulator is shutting down, or a bad
> connection somewhere is opening. The clue is that the open circuit voltage
> is so high.
Perhaps I am misunderstanding you; normal open circuit voltage is
11.3V measured with a scope.
When the system fails (shuts off), the adaptor is still connected
to load, and the scope reads 12.7V. This is higher than O.C., so I wonder
how this happens or is even possible.
> I don't see how the adapter could be the problem since it *IS*
> putting out voltage (even though it is higher than you expect).
...sorry, maybe I didn't mention that the current drops to near
zero.
I will consider what you say, that the adaptor is not faulty.
Thank you for your help,
Paul
(this should now probably go off-list, as it is off topic)
>
> Measure the voltage into and coming out of the regulator. Look for bad
> connections.
>
> dwayne
>
>
>
> Dwayne Reid <dwayner@p...>
> Trinity Electronics Systems Ltd Edmonton, AB, CANADA
> (780) 489-3199 voice (780) 487-6397 fax
>
> Celebrating 16 years of Engineering Innovation (1984 - 2000)
>
> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
> Do NOT send unsolicited commercial email to this email address.
> This message neither grants consent to receive unsolicited
> commercial email nor is intended to solicit commercial email.
>
>
>
>
I am looking to reduce a power supply to get a small unit.
There is up to 24 VAC available for this circuit.
What is needed ia 12VDC and only 12 ma.
The 12 ma is the max for the circuit so it needs to be limited for
power at 12ma.
Any tips or tricks ?
TIA.
Dave
of electrolytic capacitors. use any one of the TO-220 type voltage
regulators (either fixed or adjustable eg. LM317) to set your desired
voltage. As for the current limiting, these devices can be set up as
constant current sources also. Check out National Semiconductor's voltage
regulator line.
Jon Enoch,
PCB Design Engineer,
Northern Airborne Technology.
I am looking to reduce a power supply to get a small unit.
There is up to 24 VAC available for this circuit.
What is needed ia 12VDC and only 12 ma.
The 12 ma is the max for the circuit so it needs to be limited for
power at 12ma.
Any tips or tricks ?
2e chip. When I try to do a basic powerup and serial port connect, this chip is
detected (serial port setup is ok) but it does not respond, even when I change
the directive to 2e from 2. It says it is related to the power supply
connection. When I go back to the STAMP 2 chip, everything is fine. Can anyone
help? Thanks.
Greg
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In my project, i have several devices that require +5v so I'm using a 7805
type regulator with a couple of capacitors. Will the stamp run off of +5
volts from the regulator or does the on board regulator require higher
voltage to make its own +5 volts? I'm running this off of a battery that
may change from 9 to 18 volts so I'd rather use the external regulator that
can handle a higher voltage input. I'm thinking that it would be safer too
because hooking that little stamp directly to a motorcycle battery makes me
nervous.
Also, for polarity protection (in case someone accidentally gets the battery
polarity wrong), will a diode in line with the battery be sufficient
protection?
Thanks,
Stewart
[noparse][[/noparse]Non-text portions of this message have been removed]
There are two possible ways to provide power to the Stamp.
1) An external 7805 type regulator with the output connected to the
Vdd pin (Pin 21 on the BS2)
2) Provide 5.5 to 12v (7.5v recommended) to the Vin (pin24 on the
BS2). In this case the Vdd pin (pin 21) is able to provide a limited
amount (I do not recall the limit) of current to other devices.
A diode should be sufficient for polarity protection but don't
forget that in the forward direction, depending on the current and
type, you may drop up to 1v across the diode.
Phil
--- In basicstamps@y..., Stewart Mayer <stewlist@k...> wrote:
> Hello,
>
> In my project, i have several devices that require +5v so I'm using
a 7805
> type regulator with a couple of capacitors. Will the stamp run off
of +5
> volts from the regulator or does the on board regulator require
higher
> voltage to make its own +5 volts? I'm running this off of a
battery that
> may change from 9 to 18 volts so I'd rather use the external
regulator that
> can handle a higher voltage input. I'm thinking that it would be
safer too
> because hooking that little stamp directly to a motorcycle battery
makes me
> nervous.
>
> Also, for polarity protection (in case someone accidentally gets
the battery
> polarity wrong), will a diode in line with the battery be sufficient
> protection?
>
> Thanks,
> Stewart
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
Stewart
Original Message
From: basicstamps@yahoogroups.com
Date: Friday, September 28, 2001 03:02:17 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Power Supply
Stewart,
There are two possible ways to provide power to the Stamp.
1) An external 7805 type regulator with the output connected to the
Vdd pin (Pin 21 on the BS2)
2) Provide 5.5 to 12v (7.5v recommended) to the Vin (pin24 on the
BS2). In this case the Vdd pin (pin 21) is able to provide a limited
amount (I do not recall the limit) of current to other devices.
A diode should be sufficient for polarity protection but don't
forget that in the forward direction, depending on the current and
type, you may drop up to 1v across the diode.
Phil
--- In basicstamps@y..., Stewart Mayer <stewlist@k...> wrote:
> Hello,
>
> In my project, i have several devices that require +5v so I'm using
a 7805
> type regulator with a couple of capacitors. Will the stamp run off
of +5
> volts from the regulator or does the on board regulator require
higher
> voltage to make its own +5 volts? I'm running this off of a
battery that
> may change from 9 to 18 volts so I'd rather use the external
regulator that
> can handle a higher voltage input. I'm thinking that it would be
safer too
> because hooking that little stamp directly to a motorcycle battery
makes me
> nervous.
>
> Also, for polarity protection (in case someone accidentally gets
the battery
> polarity wrong), will a diode in line with the battery be sufficient
> protection?
>
> Thanks,
> Stewart
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
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I want to use a BSII and a dc motor controller chip for a robot that
I am building. I want to use one battery. Is it possible to split
the battery(9v) to run the motor and the BSII pins(One Regulated 5.0
v using a 7805 regulator). My project is to build a standard robot
platform and then add pcb cards for such things as IR Module ect.. I
then want to port to the sx microcontroller. I have built a test
circuit and when I measure the voltage while the motor is running I
get about 3.0 v. I don't want to interfer with the BSII.
Thnaks,
Curtis
3V will not power the Stamp. However, you can do as you describe IF the
battery can provide the voltage/current. So you may want to consider a
different battery.
Jonathan
www.madlabs.info
Original Message
From: "cenlasoft" <cenlasoft@y...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, March 06, 2004 7:24 AM
Subject: [noparse][[/noparse]basicstamps] Power Supply
> Hello,
> I want to use a BSII and a dc motor controller chip for a robot that
> I am building. I want to use one battery. Is it possible to split
> the battery(9v) to run the motor and the BSII pins(One Regulated 5.0
> v using a 7805 regulator). My project is to build a standard robot
> platform and then add pcb cards for such things as IR Module ect.. I
> then want to port to the sx microcontroller. I have built a test
> circuit and when I measure the voltage while the motor is running I
> get about 3.0 v. I don't want to interfer with the BSII.
>
> Thnaks,
> Curtis
>
>
>
>
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>
>
>
motors and the logic.
But I would prefer a separate power supply (battery and regulator)
with a common ground for the stamp and the motors. Motors are a
source of glitches which can/will interfere with the digital control
circuitry. Besides that, the motors may require a different voltage.
Regards
Adrian
that ran a 12 Volt motor, and the 12 Volts went through a 5 Volt three
terminal regulator. Got enough glitches to cause the stamp to reset at a
high rate of speed. Placing back to back zener diodes across the motor,
rated slightly more than 12 Volts, and the capacitor both at the motor and
at the board end driving the motor made all the problems go away.
If you are using the same Voltage for motor and stamp, then an inductor
between the stamp and the supply, with capacitance on both sides of the
inductor, as a low pass filter, might help.
Note that it wasn't a stamp problem, but a system noise problem.
Original Message
From: Adrian Schneider [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=yxrlWdlNdxLQN_XJk_99ArPPE_gYJDI1jmeGzZ7ATW4jLgSGdDlC8sUb-pJ1mK0MK7gEJGXYhmvv1QEbL6f65fOkk2U]adrian.schneider@t...[/url
Sent: Monday, March 08, 2004 7:23 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Power Supply
Principally it is possible to use a single power source for the motors and
the logic. But I would prefer a separate power supply (battery and
regulator) with a common ground for the stamp and the motors. Motors are a
source of glitches which can/will interfere with the digital control
circuitry. Besides that, the motors may require a different voltage.
Regards
Adrian
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Before I place my order for the OEM BSII's, can you tell me if the
12 VDC/1 Amp Power Supply, Stock#: 750-00007, is regulated or not? I need
one or two, and if they are regulated, I'd like buy them from Parallax and
include them in the order too.
Thanks,
Tim Medema
[noparse][[/noparse]Non-text portions of this message have been removed]
matter of fact, we don't carry any regulated power supplies.
Erik Wood
Parallax, Inc.
Original Message
From: Timothy Medema [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=cLuLDNXKntLfNSxKPHZm0bws3ZSqyLh5b-SnxI6ylzYy9QoZtxjKhbKDs2U9Xn--zxbvDW1PwFop50bP]timm@c...[/url
Sent: Wednesday, June 23, 2004 12:34 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Power Supply
Erik and All,
Before I place my order for the OEM BSII's, can you tell me if
the
12 VDC/1 Amp Power Supply, Stock#: 750-00007, is regulated or not? I
need
one or two, and if they are regulated, I'd like buy them from Parallax
and
include them in the order too.
Thanks,
Tim Medema
[noparse][[/noparse]Non-text portions of this message have been removed]
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This message has been scanned by WebShield. Please report SPAM to
abuse@p....
Tim
At 01:06 PM 6/23/2004, you wrote:
>I confirmed with our technical support that it's unregulated. As a
>matter of fact, we don't carry any regulated power supplies.
>
>Erik Wood
>Parallax, Inc.
>
>
>
Original Message
>From: Timothy Medema [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=qJ-zeUmdBCFfkyFYe0YtaDTRT6rIW6YEx2_H4QvyhozmI_xcVoDKLrMzwM1sHr4g60kSq0jJfTiE5KVsV3Ol6g]timm@c...[/url
>Sent: Wednesday, June 23, 2004 12:34 PM
>To: basicstamps@yahoogroups.com
>Subject: [noparse][[/noparse]basicstamps] Power Supply
>
>
>Erik and All,
>
> Before I place my order for the OEM BSII's, can you tell me if
>the
>12 VDC/1 Amp Power Supply, Stock#: 750-00007, is regulated or not? I
>need
>one or two, and if they are regulated, I'd like buy them from Parallax
>and
>include them in the order too.
>
>Thanks,
>
>Tim Medema
>
>
>
>[noparse][[/noparse]Non-text portions of this message have been removed]
>
>
>
>To UNSUBSCRIBE, just send mail to:
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>
>
>
>
>
>This message has been scanned by WebShield. Please report SPAM to
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>
assume they contain a small transformer with a
half-wave or full-wave regulator, and MAYBE an
output capacitor to reduce the ripple a little.
Thus they DO output DC which is suitable for
input into a 7805 or 3904-5 linear regulator.
Actually having the regulator built-in to the
wall-wart seems to have limited usefulness for
the increase in price.
I guess I don't understand Timothy's reluctance
to buy 'unregulated' versus 'regulated' wall-warts.
--- In basicstamps@yahoogroups.com, "Erik Wood" <ewood@p...> wrote:
> I confirmed with our technical support that it's unregulated. As a
> matter of fact, we don't carry any regulated power supplies.
>
> Erik Wood
> Parallax, Inc.
>
>
>
Original Message
> From: Timothy Medema [noparse][[/noparse]mailto:timm@c...]
> Sent: Wednesday, June 23, 2004 12:34 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Power Supply
>
>
> Erik and All,
>
> Before I place my order for the OEM BSII's, can you tell
me if
> the
> 12 VDC/1 Amp Power Supply, Stock#: 750-00007, is regulated or not?
I
> need
> one or two, and if they are regulated, I'd like buy them from
Parallax
> and
> include them in the order too.
>
> Thanks,
>
> Tim Medema
>
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
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Subject
> and Body of the message will be ignored.
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>
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>
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>
>
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> abuse@p...
at 12 Volts at one Amp. This means that when they are fully loaded at 1
Amp, that they put out nominally 12 Volts. But if you don't draw one Amp,
the Voltage goes up, a lot. I have seen as high as 16-17 Volts unloaded.
Original Message
From: Allan Lane [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=sM6JnihwehLmrISpHm_jPBvhWW8ZUWp5cXyfc_BCMyOTc-TGL_HcKgSqbn1Exe11yyjGpAWi5RPgrBykUrfawCUk6Q]allan.lane@h...[/url
Sent: Wednesday, June 23, 2004 4:55 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Power Supply
So, when you say they are 'unregulated', I then
assume they contain a small transformer with a
half-wave or full-wave regulator, and MAYBE an
output capacitor to reduce the ripple a little.
Thus they DO output DC which is suitable for
input into a 7805 or 3904-5 linear regulator.
Actually having the regulator built-in to the
wall-wart seems to have limited usefulness for
the increase in price.
I guess I don't understand Timothy's reluctance
to buy 'unregulated' versus 'regulated' wall-warts.
--- In basicstamps@yahoogroups.com, "Erik Wood" <ewood@p...> wrote:
> I confirmed with our technical support that it's unregulated. As a
> matter of fact, we don't carry any regulated power supplies.
>
> Erik Wood
> Parallax, Inc.
>
>
>
Original Message
> From: Timothy Medema [noparse][[/noparse]mailto:timm@c...]
> Sent: Wednesday, June 23, 2004 12:34 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Power Supply
>
>
> Erik and All,
>
> Before I place my order for the OEM BSII's, can you tell
me if
> the
> 12 VDC/1 Amp Power Supply, Stock#: 750-00007, is regulated or not?
I
> need
> one or two, and if they are regulated, I'd like buy them from
Parallax
> and
> include them in the order too.
>
> Thanks,
>
> Tim Medema
>
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
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I'm not really reluctant to buy an unregulated wall-wart, it's
much more that I'm cheap and lazy. If the wall-wart is regulated, it saves
me the time of including a regulator in the project, and usually a
mass-produced regulated wall-wart is less expensive than building the
regulator separately myself. Like I said, it's more that I'm cheap and
lazy, that's all.
Tim Medema
At 01:55 PM 6/23/2004, you wrote:
>So, when you say they are 'unregulated', I then
>assume they contain a small transformer with a
>half-wave or full-wave regulator, and MAYBE an
>output capacitor to reduce the ripple a little.
>
>Thus they DO output DC which is suitable for
>input into a 7805 or 3904-5 linear regulator.
>
>Actually having the regulator built-in to the
>wall-wart seems to have limited usefulness for
>the increase in price.
>
>I guess I don't understand Timothy's reluctance
>to buy 'unregulated' versus 'regulated' wall-warts.
>
>--- In basicstamps@yahoogroups.com, "Erik Wood" <ewood@p...> wrote:
> > I confirmed with our technical support that it's unregulated. As a
> > matter of fact, we don't carry any regulated power supplies.
> >
> > Erik Wood
> > Parallax, Inc.
> >
> >
> >
Original Message
> > From: Timothy Medema [noparse][[/noparse]mailto:timm@c...]
> > Sent: Wednesday, June 23, 2004 12:34 PM
> > To: basicstamps@yahoogroups.com
> > Subject: [noparse][[/noparse]basicstamps] Power Supply
> >
> >
> > Erik and All,
> >
> > Before I place my order for the OEM BSII's, can you tell
>me if
> > the
> > 12 VDC/1 Amp Power Supply, Stock#: 750-00007, is regulated or not?
>I
> > need
> > one or two, and if they are regulated, I'd like buy them from
>Parallax
> > and
> > include them in the order too.
> >
> > Thanks,
> >
> > Tim Medema
> >
> >
> >
> > [noparse][[/noparse]Non-text portions of this message have been removed]
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the
>Subject
> > and Body of the message will be ignored.
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
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--- In basicstamps@yahoogroups.com, Timothy Medema <timm@c...> wrote:
>
> Hi Allan,
>
> I'm not really reluctant to buy an unregulated wall-wart,
it's
> much more that I'm cheap and lazy. If the wall-wart is regulated,
it saves
> me the time of including a regulator in the project, and usually a
> mass-produced regulated wall-wart is less expensive than building
the
> regulator separately myself. Like I said, it's more that I'm cheap
and
> lazy, that's all.
>
> Tim Medema
>
>
> At 01:55 PM 6/23/2004, you wrote:
> >So, when you say they are 'unregulated', I then
> >assume they contain a small transformer with a
> >half-wave or full-wave regulator, and MAYBE an
> >output capacitor to reduce the ripple a little.
> >
> >Thus they DO output DC which is suitable for
> >input into a 7805 or 3904-5 linear regulator.
> >
> >Actually having the regulator built-in to the
> >wall-wart seems to have limited usefulness for
> >the increase in price.
> >
> >I guess I don't understand Timothy's reluctance
> >to buy 'unregulated' versus 'regulated' wall-warts.
> >
> >--- In basicstamps@yahoogroups.com, "Erik Wood" <ewood@p...> wrote:
> > > I confirmed with our technical support that it's unregulated.
As a
> > > matter of fact, we don't carry any regulated power supplies.
> > >
> > > Erik Wood
> > > Parallax, Inc.
> > >
> > >
> > >
Original Message
> > > From: Timothy Medema [noparse][[/noparse]mailto:timm@c...]
> > > Sent: Wednesday, June 23, 2004 12:34 PM
> > > To: basicstamps@yahoogroups.com
> > > Subject: [noparse][[/noparse]basicstamps] Power Supply
> > >
> > >
> > > Erik and All,
> > >
> > > Before I place my order for the OEM BSII's, can you
tell
> >me if
> > > the
> > > 12 VDC/1 Amp Power Supply, Stock#: 750-00007, is regulated or
not?
> >I
> > > need
> > > one or two, and if they are regulated, I'd like buy them from
> >Parallax
> > > and
> > > include them in the order too.
> > >
> > > Thanks,
> > >
> > > Tim Medema
> > >
> > >
> > >
> > > [noparse][[/noparse]Non-text portions of this message have been removed]
> > >
> > >
> > >
> > > To UNSUBSCRIBE, just send mail to:
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> >Subject
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> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> > >
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to
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> >
Dave
Timothy Medema <timm@c...> wrote:
Hi Allan,
I'm not really reluctant to buy an unregulated wall-wart, it's
much more that I'm cheap and lazy. If the wall-wart is regulated, it saves
me the time of including a regulator in the project, and usually a
mass-produced regulated wall-wart is less expensive than building the
regulator separately myself. Like I said, it's more that I'm cheap and
lazy, that's all.
Tim Medema
At 01:55 PM 6/23/2004, you wrote:
>So, when you say they are 'unregulated', I then
>assume they contain a small transformer with a
>half-wave or full-wave regulator, and MAYBE an
>output capacitor to reduce the ripple a little.
>
>Thus they DO output DC which is suitable for
>input into a 7805 or 3904-5 linear regulator.
>
>Actually having the regulator built-in to the
>wall-wart seems to have limited usefulness for
>the increase in price.
>
>I guess I don't understand Timothy's reluctance
>to buy 'unregulated' versus 'regulated' wall-warts.
>
>--- In basicstamps@yahoogroups.com, "Erik Wood" wrote:
> > I confirmed with our technical support that it's unregulated. As a
> > matter of fact, we don't carry any regulated power supplies.
> >
> > Erik Wood
> > Parallax, Inc.
> >
> >
> >
Original Message
> > From: Timothy Medema [noparse][[/noparse]mailto:timm@c...]
> > Sent: Wednesday, June 23, 2004 12:34 PM
> > To: basicstamps@yahoogroups.com
> > Subject: [noparse][[/noparse]basicstamps] Power Supply
> >
> >
> > Erik and All,
> >
> > Before I place my order for the OEM BSII's, can you tell
>me if
> > the
> > 12 VDC/1 Amp Power Supply, Stock#: 750-00007, is regulated or not?
>I
> > need
> > one or two, and if they are regulated, I'd like buy them from
>Parallax
> > and
> > include them in the order too.
> >
> > Thanks,
> >
> > Tim Medema
> >
> >
> >
> > [noparse][[/noparse]Non-text portions of this message have been removed]
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the
>Subject
> > and Body of the message will be ignored.
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
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>
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[noparse][[/noparse]Non-text portions of this message have been removed]
Good advice. I'd also agree that it is good design practice to
use "local regulation". When I use a regulated wall-warts, I always add a
lot of filtering at the project end for the very reasons you mentioned.
Tim
At 05:31 PM 6/24/2004, you wrote:
>I have to agree with Allan on this one. It is good design practice to use
>"local regulation", where the voltage regulator is as close as possible to
>the device(s) to be powered. The main reason for this is to reduce the
>susceptibility of the circuit to high frequency noise. Such noise can be
>hard to detect, and will drive a Stamp crazy.
>
>Dave
>
>Timothy Medema <timm@c...> wrote:
>
>Hi Allan,
>
>I'm not really reluctant to buy an unregulated wall-wart, it's
>much more that I'm cheap and lazy. If the wall-wart is regulated, it saves
>me the time of including a regulator in the project, and usually a
>mass-produced regulated wall-wart is less expensive than building the
>regulator separately myself. Like I said, it's more that I'm cheap and
>lazy, that's all.
>
>Tim Medema
>
>
>At 01:55 PM 6/23/2004, you wrote:
> >So, when you say they are 'unregulated', I then
> >assume they contain a small transformer with a
> >half-wave or full-wave regulator, and MAYBE an
> >output capacitor to reduce the ripple a little.
> >
> >Thus they DO output DC which is suitable for
> >input into a 7805 or 3904-5 linear regulator.
> >
> >Actually having the regulator built-in to the
> >wall-wart seems to have limited usefulness for
> >the increase in price.
> >
> >I guess I don't understand Timothy's reluctance
> >to buy 'unregulated' versus 'regulated' wall-warts.
> >
> >--- In basicstamps@yahoogroups.com, "Erik Wood" wrote:
> > > I confirmed with our technical support that it's unregulated. As a
> > > matter of fact, we don't carry any regulated power supplies.
> > >
> > > Erik Wood
> > > Parallax, Inc.
> > >
> > >
> > >
Original Message
> > > From: Timothy Medema [noparse][[/noparse]mailto:timm@c...]
> > > Sent: Wednesday, June 23, 2004 12:34 PM
> > > To: basicstamps@yahoogroups.com
> > > Subject: [noparse][[/noparse]basicstamps] Power Supply
> > >
> > >
> > > Erik and All,
> > >
> > > Before I place my order for the OEM BSII's, can you tell
> >me if
> > > the
> > > 12 VDC/1 Amp Power Supply, Stock#: 750-00007, is regulated or not?
> >I
> > > need
> > > one or two, and if they are regulated, I'd like buy them from
> >Parallax
> > > and
> > > include them in the order too.
> > >
> > > Thanks,
> > >
> > > Tim Medema
> > >
> > >
> > >
> > > [noparse][[/noparse]Non-text portions of this message have been removed]
> > >
> > >
> > >
> > > To UNSUBSCRIBE, just send mail to:
> > > basicstamps-unsubscribe@yahoogroups.com
> > > from the same email address that you subscribed. Text in the
> >Subject
> > > and Body of the message will be ignored.
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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> >
> >
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>
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>
> Hi Dave,
>
> Good advice. I'd also agree that it is good design
practice to
> use "local regulation". When I use a regulated wall-warts, I
always add a
> lot of filtering at the project end for the very reasons you
mentioned.
>
> Tim
Local filtering is a good idea if you are doing any switching as that
can create spikes.
also if you are doing any ADC inputs as the power supply is often the
reference for the ADC chip.
and if you are doing PWM as the high speed may create unwanted noise
on the line.
Dave