3V regulator
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Posts: 46,084
I am using a laser diode for a project and need to supply it with
3VDC. Neither DigiKey nor Jameco have a 3V regulator. Any idea of
how where to get it or a trick other than a voltage divider (power
dissipation is an issue since I am ruuning off batteries)?
Thanks,
Al Najjar
3VDC. Neither DigiKey nor Jameco have a 3V regulator. Any idea of
how where to get it or a trick other than a voltage divider (power
dissipation is an issue since I am ruuning off batteries)?
Thanks,
Al Najjar
Comments
brownstamp@y... writes:
> I am using a laser diode for a project and need to supply it with
> 3VDC. Neither DigiKey nor Jameco have a 3V regulator. Any idea of
> how where to get it or a trick other than a voltage divider (power
>
Sounds like you just need a current-limiting resistor, not a full-blown
regulator. Since you know the forward voltage and can find the forward
current, calculating the resistor value becomes trivial with an known power
supply (i.e., 5v).
-- Jon Williams
-- Parallax
[noparse][[/noparse]Non-text portions of this message have been removed]
bill, or if you need 3Vdc from a 6Vdc or 12VVdc source, the old standby is
the LM317 and a pair of resistors as shown here
http://www.qsl.net/kf4haz/12to9/
with R1=150 and R2=220 the output should be about 3.08 Volts dc +/- 5%
or R1=330 and R2=470 would result in 3.03 +/- 5% provided the load is at
least a few milliamps.
KF4HAZ Lonnie
Original Message
From: "brownstamp" <brownstamp@
> I am using a laser diode for a project and need to supply it with
> 3VDC. Neither DigiKey nor Jameco have a 3V regulator. Any idea of
> how where to get it or a trick other than a voltage divider (power
> dissipation is an issue since I am ruuning off batteries)?
>
>
> Thanks,
>
>
> Al Najjar
switcher -- is going to burn up more power than a resistor. I wonder if
you could use PWM here? Switch a transistor at a certain frequency and
use an RC to integrate it to 3V. That could be pretty battery friendly
if your oscillator was efficient (or if you used the Stamp or other
existing circuit to do the switching).
Al Williams
AWC
* Floating point math for the Stamp, PIC, SX, or any microcontroller
http://www.al-williams.com/awce/pak1.htm
>
Original Message
> From: brownstamp [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=AcfpVtC5jGwgDOyX9jAMKeUDz484cy67uXC8ZMFW9uaY01cBQsg7-VFM0mtJ1e7J8W0hm5oja6O0TADnEA]brownstamp@y...[/url
> Sent: Monday, January 14, 2002 10:19 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] 3V regulator
>
>
> I am using a laser diode for a project and need to supply it with
> 3VDC. Neither DigiKey nor Jameco have a 3V regulator. Any idea of
> how where to get it or a trick other than a voltage divider (power
> dissipation is an issue since I am ruuning off batteries)?
>
>
> Thanks,
>
>
> Al Najjar
>
>
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> http://docs.yahoo.com/info/terms/
>
Stamp's pins to do that.
Al Najjar
--- In basicstamps@y..., "Al Williams" <alw@a...> wrote:
> As Jon suggests, you could use a resistor. A regulator -- unless
it is a
> switcher -- is going to burn up more power than a resistor. I
wonder if
> you could use PWM here? Switch a transistor at a certain frequency
and
> use an RC to integrate it to 3V. That could be pretty battery
friendly
> if your oscillator was efficient (or if you used the Stamp or other
> existing circuit to do the switching).
>
> Al Williams
> AWC
> * Floating point math for the Stamp, PIC, SX, or any
microcontroller
> http://www.al-williams.com/awce/pak1.htm
>
>
>
> >
Original Message
> > From: brownstamp [noparse][[/noparse]mailto:brownstamp@y...]
> > Sent: Monday, January 14, 2002 10:19 AM
> > To: basicstamps@y...
> > Subject: [noparse][[/noparse]basicstamps] 3V regulator
> >
> >
> > I am using a laser diode for a project and need to supply it with
> > 3VDC. Neither DigiKey nor Jameco have a 3V regulator. Any idea
of
> > how where to get it or a trick other than a voltage divider
(power
> > dissipation is an issue since I am ruuning off batteries)?
> >
> >
> > Thanks,
> >
> >
> > Al Najjar
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@y...
> > from the same email address that you subscribed. Text in the
> > Subject and Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> >
diodes
Original Message
From: "brownstamp" <brownstamp@y...>
To: <basicstamps@yahoogroups.com>
Sent: January 14, 2002 8:18 AM
Subject: [noparse][[/noparse]basicstamps] 3V regulator
I am using a laser diode for a project and need to supply it with
3VDC. Neither DigiKey nor Jameco have a 3V regulator. Any idea
of
how where to get it or a trick other than a voltage divider
(power
dissipation is an issue since I am ruuning off batteries)?
Thanks,
Al Najjar
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the
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Things like the 77L03 (3v), 78L02 (2.6v), 80L30 (from the digikey catalog).
A IC like the LM317 would work, you could tune it down to 3v.
Plus you could get a Sony Walkman AC adapter powersupply, these all seem to
be 3volt supplies as well. I saw some surplus outlets with Sony 3v supplies
as well. I have a non descript multioutlet Ac supply that has a 3v position
on it's voltage switch. Radio Shack had a some little AC supplies that would
provide 3v as well.
Of course you could tap off some resistors at the right point and get 3v, or
use some plain diodes in series too (0.7v drop per diode if I remember
right).
Original Message
From: FalconWireless Tech Support - KF4HAZ
[noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=RjDGwzfQM5kdnPFha38p1PfTqAeaci3Bjryfoedwki6TNQ6QpK8OtxfvBZYaNN8Cw3ZTVip9QxU75n_O7Prpae-Rv6nB]techsupport@f...[/url
Sent: Monday, January 14, 2002 10:34 AM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] 3V regulator
I am sure there are some new Low-Drop-Out regulators that would fill the
bill, or if you need 3Vdc from a 6Vdc or 12VVdc source, the old standby is
the LM317 and a pair of resistors as shown here
http://www.qsl.net/kf4haz/12to9/
with R1=150 and R2=220 the output should be about 3.08 Volts dc +/- 5%
or R1=330 and R2=470 would result in 3.03 +/- 5% provided the load is at
least a few milliamps.
KF4HAZ Lonnie
Original Message
From: "brownstamp" <brownstamp@
> I am using a laser diode for a project and need to supply it with
> 3VDC. Neither DigiKey nor Jameco have a 3V regulator. Any idea of
> how where to get it or a trick other than a voltage divider (power
> dissipation is an issue since I am ruuning off batteries)?
>
>
> Thanks,
>
>
> Al Najjar
To UNSUBSCRIBE, just send mail to:
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I use 3v regulators from DigiKey ( lp2950cz-3.0-nd ) to Jameco's laser
modules.
Jay
in series with a pot (as a variable resistor), in series with the hot
lead of a green laser diode rated at 3 volts. The purpose of the pot is
to vary the intensity of the green diode, which appears to the human eye
about 35 times brighter than a red diode at the same rated power.
Dennis
Original Message
From: jonwms@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=glZQQenwTjEFnw-v2dcvu5f_dAESvUFmYvrtwD4jYRISFAdoJkkyVjL1-ypNTZgJLJ7T_mRb]jonwms@a...[/url
Sent: Monday, January 14, 2002 8:26 AM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] 3V regulator
In a message dated 1/14/02 10:22:06 AM Central Standard Time,
brownstamp@y... writes:
> I am using a laser diode for a project and need to supply it with
> 3VDC. Neither DigiKey nor Jameco have a 3V regulator. Any idea of
> how where to get it or a trick other than a voltage divider (power
>
Sounds like you just need a current-limiting resistor, not a full-blown
regulator. Since you know the forward voltage and can find the forward
current, calculating the resistor value becomes trivial with an known
power
supply (i.e., 5v).
-- Jon Williams
-- Parallax
[noparse][[/noparse]Non-text portions of this message have been removed]
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