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Old 04-10-2008, 09:10 PM   #1
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Default Looking for variable power supply

Hi all.
Does anyone know if there is something you can connect to my 12V power supply so that I can adjust the output? Not looking for a new power supply that does 110 to variable 0v-12V but maybe some sort of dc to dc variable converter. I did a few search on the internet but still not really sure which would work. Looking to use it for tire warmers and whatever other 5~7volt accesories I might have. THANKS

Something like this? http://www.anykits.com/catalog/produ...roducts_id=264

(sorry for the double post. This is in another thread as well, more traffic here?)
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Old 04-11-2008, 05:11 AM   #2
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Quote:
Originally Posted by minicooper View Post
Hi all.
Does anyone know if there is something you can connect to my 12V power supply so that I can adjust the output? Not looking for a new power supply that does 110 to variable 0v-12V but maybe some sort of dc to dc variable converter. I did a few search on the internet but still not really sure which would work. Looking to use it for tire warmers and whatever other 5~7volt accesories I might have. THANKS

Something like this? http://www.anykits.com/catalog/produ...roducts_id=264

(sorry for the double post. This is in another thread as well, more traffic here?)
i think you would be looking for a variable 555 timer (pulse width modulator). if you look up 555 voltage regulation circuits it should give you an idea. the chip can handle 500mah as it is, but i would recommend using a mosfet for something like tyre warmers, so bear that in mind when you build it.
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Old 04-11-2008, 05:49 AM   #3
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If you want to rig your own DC-DC. The easiest way to do is to get LM723 voltage regulator (2V-37V) with 150ma output. Then use the pass transistor or some heavy duty Darlington pair to get the high current output. Then have a capacitor at the output to charge up the output voltage and to soft start the motor, just in cause you want to it to run the motor.
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Old 04-11-2008, 11:03 AM   #4
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I have an Alnac 32amp P/S that is adjustable from 5V to 16V.

How many amps are you wanting to use? I have seen some 1am DC-DC convertors for about $15 check ebay I used the keywords "dc-dc" and "varible dc" and both came up with good searches but different results
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