Power conversion
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I have a power supply that is used to power other devices in my project.
It will out 5vdc with 15amps, 5vdc with 1amp and 12vdc with 1 amp.
If I wanted to use one of these outputs to power my basic stamp, would I
need to convert anything?
When it says 15amps, does that really matter if the device does not pull
that many amps?
Amps is something I don’t understand.
Can I use any of the power supplies and what do I need to do to use it?
Thanks,
Wayne Fulcher
wayne@d...
[noparse][[/noparse]Non-text portions of this message have been removed]
It will out 5vdc with 15amps, 5vdc with 1amp and 12vdc with 1 amp.
If I wanted to use one of these outputs to power my basic stamp, would I
need to convert anything?
When it says 15amps, does that really matter if the device does not pull
that many amps?
Amps is something I don’t understand.
Can I use any of the power supplies and what do I need to do to use it?
Thanks,
Wayne Fulcher
wayne@d...
[noparse][[/noparse]Non-text portions of this message have been removed]
Comments
Stamps can be run on 5V and your linear regulated supply should be fine,
especially if it's an old PC power supply.
For example, on a BS2, connect your 5V supply to pin 21 (Vdd) instead of pin
24 (Vin) which is connected to it's own internal regulator which requires
6V.
The load will draw current from the supply as needed, so it doesn't matter
if you use a supply with a 500mA capacity or a 100A capacity.
If your supply is not linear, but a switcher - you will need to maintain a
minimum load to obtain the correct output from it.
So, if it's a linear regulated supply, the pin connection is your only
needed change.
Chris
> I have a power supply that is used to power other devices in
> my project.
> It will out 5vdc with 15amps, 5vdc with 1amp and 12vdc with 1 amp.
>
> If I wanted to use one of these outputs to power my basic
> stamp, would I
> need to convert anything?
> When it says 15amps, does that really matter if the device
> does not pull
> that many amps?
> Amps is something I don’t understand.
>
> Can I use any of the power supplies and what do I need to do
> to use it?
You can use the +5 VDC output to power the Stamp. This
should be tied to the VDD pin (unregulated power
within a range specific to each Stamp model would go
to the VIN pin, which should not be connected when VDD
is connected). Is this a one-off project, using what
you have? If not, 15 amps on your +5 is a lot of
current, and you probably don't need such a
high-powered (and likely more expensive) power supply.
Don't forget to connect the power supply ground to the
Stamp's VSS.
Bob Pence
--- Wayne Fulcher <wayne@d...> wrote:
> I have a power supply that is used to power other
> devices in my project.
> It will out 5vdc with 15amps, 5vdc with 1amp and
> 12vdc with 1 amp.
>
> If I wanted to use one of these outputs to power my
> basic stamp, would I
> need to convert anything?
> When it says 15amps, does that really matter if the
> device does not pull
> that many amps?
> Amps is something I don’t understand.
>
> Can I use any of the power supplies and what do I
> need to do to use it?
>
> Thanks,
> Wayne Fulcher
> wayne@d...
>
>
>
> [noparse][[/noparse]Non-text portions of this message have been
> removed]
>
>
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limiting or any fuses on the output?
A 15 amp supply and no short-circuit protection can damage alot of things if
you make a wiring mistake -- use the 1 amp outputs for stamp stuff.
As far as powering the stamp, you can do it two ways. You can either supply
5 volts DC to it directly via the Vdd pin (which bypasses the built-in
regulator on the stamp), *OR* a higher voltage on the Vin pin. The stamp
manual says Vin should be 5.5 to 12 volts DC, with 7.5 volts DC recommended.
Original Message
I have a power supply that is used to power other devices in my project.
It will out 5vdc with 15amps, 5vdc with 1amp and 12vdc with 1 amp.
If I wanted to use one of these outputs to power my basic stamp, would I
need to convert anything?
When it says 15amps, does that really matter if the device does not pull
that many amps?
Amps is something I don't understand.
Can I use any of the power supplies and what do I need to do to use it?