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Old 7th May 2005, 04:03 PM   #1
Anthrax is offline Anthrax  Australia
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Default convert a 12VDC, 800ma wall wart to 22-24VDC, ~400ma

how would i go about doing this...

converting a 12VDC 800ma wall wart to around 22-24volts and around 400ma ?

is this possible ?
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Old 7th May 2005, 05:56 PM   #2
paulb is offline paulb  Canada
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Yes, it's possible. You need a boost switched converter. Like this one:
http://www.national.com/ds.cgi/LM/LM1577.pdf
National has design software available to help figure out how to use their parts.
Other manufacturers (Linear Technology, etc.) would have similar devices.
This will be noisier than a linear power supply, and may be tricky to build.
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Old 7th May 2005, 06:18 PM   #3
dhaen is offline dhaen  Europe
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Or, change the rectifier system:
If it's half-wave: change to bridge, change the cap to correct voltage.
If it's bridge: change to voltage doubler, add second cap.

The above assumes it's an unregulated supply.
Voltage doubler circuits have poorer regulation, which may be an issue.

It's easier to go and buy a new one, but you can learn nore by trying
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Old 9th May 2005, 05:44 AM   #4
Kenshin is offline Kenshin  China
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a simple voltage doubler based on diodes & capacitors will do this job well. I'm quite satisfied about its perfomance on our robot.
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