PWM Amplification to 0-10V
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Posts: 46,084
Hi All,
Am fairly new to electronics so bear with me if this sounds daft! I
need to amplify the O-5V PWM signal that the stamp outputs to a 0-
10V PWM signal. Has anyone any information on how to go about this.
Any help will be most greatfully appreciated.
Many thanks
Hugh
Am fairly new to electronics so bear with me if this sounds daft! I
need to amplify the O-5V PWM signal that the stamp outputs to a 0-
10V PWM signal. Has anyone any information on how to go about this.
Any help will be most greatfully appreciated.
Many thanks
Hugh
Comments
http://groups.yahoo.com/group/basicstamps/message/39364.
In his case, he needed 0-12V and 4W so you actually have it easier. You
could select an op amp to run at 12V and easily get 10V out.
Regards,
Al Williams
AWC
Stamp FAQ: http://www.wd5gnr.com/stampfaq.htm
Original Message
From: hughgoodbody [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=-K5cwdxQbKmvqxmDZ7T42VNykHXNswHgfEEO5jgn3K8-ls_PE_NLhZfz1GPPVQS496pZTQ9ovVetgSRz5eEZBwM]hughgoodbody@y...[/url
Sent: Wednesday, January 21, 2004 8:48 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] PWM Amplification to 0-10V
Hi All,
Am fairly new to electronics so bear with me if this sounds daft! I
need to amplify the O-5V PWM signal that the stamp outputs to a 0- 10V PWM
signal. Has anyone any information on how to go about this.
Any help will be most greatfully appreciated.
Many thanks
Hugh
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from Vin to Vss to power the stamp. The resistor value
should be selected to limit the voltage to the stamp, 75 ohms will drop 7.5v at
100ma and leave 7.5v to power the stamp, if your app
draws a lot less than the max (most of mine are around 20ma.) try 100 to 470
ohms the goal here is to keep the stamp input voltage
between 5.5v an 11v to limit its internal dissipation.
Now finally use the full 15v to power an op amp such as the lm2902 that is
capable of output swings to 0v, and feed your pwm signal
to its non-inverting input, take your output directly from its output pin and
connect a resistor from there to the inverting input,
add another equal value resistor from the inverting input to Gnd. The inverting
input will now see 1/2 the op-amps output and drive
it's output to 2x the input voltage.
KF4HAZ - Lonnie
From: "hughgoodbody" <hughgoodbody@y
> Hi All,
>
> Am fairly new to electronics so bear with me if this sounds daft! I
> need to amplify the O-5V PWM signal that the stamp outputs to a 0-
> 10V PWM signal. Has anyone any information on how to go about this.
> Any help will be most greatfully appreciated.
> Many thanks
>
> Hugh
the output with an inverting unity (no gain) stage and there you are. A
dual-op amp like an MC1458 would probably work well for you.
jim
http://www.geocities.com/jimforkin2003/
Original Message
From: hughgoodbody [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=8UAdY2ruVlG9VQ_UTv1SG-cinv8pLzcXXXAft-Qa6wOBe-9V4OfteL_dGJ7QRPfEGUUNLu8AmeBaPu-IQCjG7Mg]hughgoodbody@y...[/url
Sent: Wednesday, January 21, 2004 9:48 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] PWM Amplification to 0-10V
Hi All,
Am fairly new to electronics so bear with me if this sounds daft! I
need to amplify the O-5V PWM signal that the stamp outputs to a 0-
10V PWM signal. Has anyone any information on how to go about this.
Any help will be most greatfully appreciated.
Many thanks
Hugh
To UNSUBSCRIBE, just send mail to:
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Two questions:
1) how much current can the 0 to 5 volt PWM signal sink/source?
2) how much current does teh 0 to 10 volt PWM signal need to sink or source?
Setting up this circuit should be very simple once I know answers to the
above.
Ken
In a message dated 1/21/2004 7:07:06 AM Pacific Standard Time,
hughgoodbody@y... writes:
Hi All,
Am fairly new to electronics so bear with me if this sounds daft! I
need to amplify the O-5V PWM signal that the stamp outputs to a 0-
10V PWM signal. Has anyone any information on how to go about this.
Any help will be most greatfully appreciated.
Many thanks
Hugh
[noparse][[/noparse]Non-text portions of this message have been removed]
The 0-5V PWM Signal I think will be approx 5-10mA
The 0-10V PWM Signal Max Current is 1.1A and max Power is 0.5W
Hope this helps!
--- In basicstamps@yahoogroups.com, smartdim@a... wrote:
> Hugh,
>
> Two questions:
>
> 1) how much current can the 0 to 5 volt PWM signal sink/source?
>
> 2) how much current does teh 0 to 10 volt PWM signal need to sink
or source?
>
> Setting up this circuit should be very simple once I know answers
to the
> above.
>
> Ken
>
>
> In a message dated 1/21/2004 7:07:06 AM Pacific Standard Time,
> hughgoodbody@y... writes:
> Hi All,
>
> Am fairly new to electronics so bear with me if this sounds daft!
I
> need to amplify the O-5V PWM signal that the stamp outputs to a 0-
> 10V PWM signal. Has anyone any information on how to go about
this.
> Any help will be most greatfully appreciated.
> Many thanks
>
> Hugh
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
Couple other questions I forgot to ask, what is the frequency of the PWM
signal.
Also, will the 0 to 10 v pwm provide power (source current) to the load, or
provide ground (sink current) to the load.
Ken
In a message dated 1/21/2004 1:19:17 PM Pacific Standard Time,
hughgoodbody@y... writes:
Ken,
The 0-5V PWM Signal I think will be approx 5-10mA
The 0-10V PWM Signal Max Current is 1.1A and max Power is 0.5W
Hope this helps!
[noparse][[/noparse]Non-text portions of this message have been removed]
The signal will provide current to the load. As to the frequency, i
am not sure. The signal is being generated from the stamp and the
cycle value am using is 100ms, but this can be altered.
--- In basicstamps@yahoogroups.com, smartdim@a... wrote:
> It helps!!!
>
> Couple other questions I forgot to ask, what is the frequency of
the PWM
> signal.
>
> Also, will the 0 to 10 v pwm provide power (source current) to the
load, or
> provide ground (sink current) to the load.
>
> Ken
>
>
> In a message dated 1/21/2004 1:19:17 PM Pacific Standard Time,
> hughgoodbody@y... writes:
> Ken,
>
> The 0-5V PWM Signal I think will be approx 5-10mA
>
> The 0-10V PWM Signal Max Current is 1.1A and max Power is 0.5W
>
> Hope this helps!
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
I'm not 100% sure what the signal is supposed to look
like at the load, but here's a couple ideas:
1) Filter the PWM signal from the Stamp through an R/C
circuit, then drive the varying signal into a power
op-amp (something like a TDA2040 or LM1875, etc. with
appropriate power supply and heatsinking). The power
op-amp can provide the necessary gain to get get the
signal amplitude you're looking for and can easily
drive +/- a couple amps. These are designed for audio,
so they can easily handle from DC to the fastest
signal a Stamp can deliver.
2) Drive the PWM signal directly into a power switch
(like a TC4425 or UC2710 from Digi-Key also with
appropriate power supply). These switches will both
sink and source from 3 to 6 amps with very fast
slew-rates. Plus, these have both an inverting and
non-inverting output so you can run them in a bridged
configuation to double the output swing to the load.
Best of all is these saturate so well, the don't
require heatsinking and are in an 8-pin DIP package.
This will provide a high-current PWM signal to the
load, but the voltage delivered will depend on the
power supply rails or bridge configuration. With the
bridge configuration, you only need a single 5V supply
to get 0-10 volts.
Regards,
DrDiode
--- hughgoodbody <hughgoodbody@y...> wrote:
> Ken,
>
> The signal will provide current to the load. As to
> the frequency, i
> am not sure. The signal is being generated from the
> stamp and the
> cycle value am using is 100ms, but this can be
> altered.
>
>
> --- In basicstamps@yahoogroups.com, smartdim@a...
> wrote:
> > It helps!!!
> >
> > Couple other questions I forgot to ask, what is
> the frequency of
> the PWM
> > signal.
> >
> > Also, will the 0 to 10 v pwm provide power (source
> current) to the
> load, or
> > provide ground (sink current) to the load.
> >
> > Ken
> >
> >
> > In a message dated 1/21/2004 1:19:17 PM Pacific
> Standard Time,
> > hughgoodbody@y... writes:
> > Ken,
> >
> > The 0-5V PWM Signal I think will be approx 5-10mA
> >
> > The 0-10V PWM Signal Max Current is 1.1A and max
> Power is 0.5W
> >
> > Hope this helps!
> >
> >
> > [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
>
> To visit your group on the web, go to:
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>
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