Looking to build a somewhat simple variable voltage DC PS

[flinx]

Re: Looking to build a somewhat simple variable voltage DC PS

Actually built the powersupply.



It has a 25 amp bridge rectifier, and uses an LM396 variable voltage regulator, right now only the right 2 terminals are connected. at some point the other 2 will be for unregulated voltage. The only parts that were purchased were the LM396, the 5k pot, the heat sink, and the dc socket. Everything else came from a junk ups, or in the case of the 12,000uf 80v cap an audio amp. At some point I will add a volt and amp meter. It outputs 1 to 20 VDC at up to 10 amps.

[kikkoman]

Re: Looking to build a somewhat simple variable voltage DC PS

Looking good!

Remember that you can use one or several pass transistor(s) to beef up that regulator. I don't see why it shouldn't work with an LM396.

https://www.google.com/search?q=lm31...w=1280&bih=872

Any plans on adding current limiting? It should make that thing much more versatile for lab use.

edit: on a side note, I'd estimate that xformer is good for 200 or maybe 250 watts (if my eyes don't fool me).
That's not saying it won't put out much more for short periods of time.
can you tell us the numbers printed on it?

[flinx]

Re: Looking to build a somewhat simple variable voltage DC PS

Looking good!

Remember that you can use one or several pass transistor(s) to beef up that regulator. I don't see why it shouldn't work with an LM396.

https://www.google.com/search?q=lm31...w=1280&bih=872

Any plans on adding current limiting? It should make that thing much more versatile for lab use.

edit: on a side note, I'd estimate that xformer is good for 200 or maybe 250 watts (if my eyes don't fool me).
That's not saying it won't put out much more for short periods of time.
can you tell us the numbers printed on it?

Actually it is good for at least 400 watts.
This is not the exact one but here is a pic of 2 from similar UPSs that I made an isolation transformer from: