[Noisebridge-discuss] N00b question - changing power supplyvoltage

Lee Sonko leelist at lee.org
Fri Jul 2 02:29:36 UTC 2010


Since a peltier junction is a big hunk of metal (and not a semiconductor),
and it won't draw variable amounts of power, I guess you don't need any
capacitors to smooth out the power.

 

Your 24volt 4.5 amp power supply will only be able to supply 12 volts 4.5
amps with a voltage regulator. It won't be able to supply more amperage.
Also note the voltage regulator I pointed to isn't rated for 4.5 amps. The
regulator is liable to overheat. I -think- it's ok to put 2 voltage
regulators in parallel to up the amperage ability but I don't know for sure.


 

 

Have fun freezing/burning the castle!

 

 

 

 

 

 

  _____  

From: noisebridge-discuss-bounces at lists.noisebridge.net
[mailto:noisebridge-discuss-bounces at lists.noisebridge.net] On Behalf Of Sean
Cusack
Sent: Thursday, July 01, 2010 6:03 PM
To: Ryan Castellucci
Cc: <noisebridge-discuss at lists.noisebridge.net>
Subject: Re: [Noisebridge-discuss] N00b question - changing power
supplyvoltage

 

Awesome - thanks guys!

I'm going to try to use this guy to power a peltier cooler (I've got a sweet
idea here depending on how well I can get this doo-hickey to work). It takes
12V at up to 9A, but from the reading I've been doing, it looks like you
want to stay away from the top value of amperage anyways. I'll give it a
spin with just the 4.5A first to see how it works.

Based on what I'm seeing below, if I use 2 voltage regulators in parallel,
it looks like that should handle the current without a problem. I can
totally drop in a cap after the fact to smooth out the current. Ryan - I'm
considering doing an ATX PSU mod too...I've got an extra one laying around.

Sean

On Thu, Jul 1, 2010 at 5:05 PM, Ryan Castellucci
<ryan.castellucci at gmail.com> wrote:

How much current are you drawing?  TBH, you should really just go to
weird stuff and pick one up for a few dollars.  Another option would
be converting an ATX power supply to a bench supply.


On Thu, Jul 1, 2010 at 1:57 PM, Sean Cusack <sean.p.cusack at gmail.com> wrote:
> Hey kids -
>
> So, I've got a relatively simple dilemma that I sure pops up all the time
> for those of you that are way better at electronics than me. I've got a
> power supply providing a fixed 24V @ 4.5A, but I only want to use 12V of
> that for my circuit. I originally thought I could lower the voltage using
a
> potentiometer, but because the power is so high, they all cost some
serious
> bank. Is there another (not necessarily analog) solution to changing
voltage
> and/or amperage through a circuit that is cheap to build?
>
> Sorry if this one is likely obvious - but everyone can blame Mitch for
> getting me way to into electronics for my own good :).
>
> Sean
>

> _______________________________________________
> Noisebridge-discuss mailing list
> Noisebridge-discuss at lists.noisebridge.net
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>
>




--
Ryan Castellucci http://ryanc.org/

 

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