Instant voltage and current circuit?

CWChang · 19th January 2005, 11:22 AM

Hi

I have a transformer and I want to regulate AC(less than 36v) power to DC.
Have any sample circuits that use bjt or fet to do this can show me?

Thank you.

eeka chu · 19th January 2005, 12:02 PM

I might have something mixed up, but wouldn't a rectifier and three pin LM style regulator be fine for this?

You can regulate AC using a pair of thee pin LM regulators, but you'll get AC out. If you want regulated DC out, you'll have to rectify it first.

It also depends what quality of DC you want out and at what efficiency.

hhocean · 19th January 2005, 03:25 PM

I had make a LM 317 & LM337 regulator.

AC -> Bridge -> LM317 & LM 337 -> DC

I just want to try how it's different about IC regulator and FET regulator.

AudioFreak · 19th January 2005, 03:42 PM

Quote:

Originally posted by hhocean
I had make a LM 317 & LM337 regulator.

AC -> Bridge -> LM317 & LM 337 -> DC

Don't forget to put the caps in there also!

19th January 2005, 11:22 AM	#1
CWChang diyAudio Member Join Date: Jan 2005 Location: Taipei	Instant voltage and current circuit? Hi I have a transformer and I want to regulate AC(less than 36v) power to DC. Have any sample circuits that use bjt or fet to do this can show me? Thank you.

19th January 2005, 12:02 PM	#2
eeka chu diyAudio Member Join Date: Nov 2003 Location: England	` I might have something mixed up, but wouldn't a rectifier and three pin LM style regulator be fine for this? You can regulate AC using a pair of thee pin LM regulators, but you'll get AC out. If you want regulated DC out, you'll have to rectify it first. It also depends what quality of DC you want out and at what efficiency.

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19th January 2005, 03:25 PM	#3
hhocean diyAudio Member Join Date: Nov 2004 Location: Taipei	I had make a LM 317 & LM337 regulator. AC -> Bridge -> LM317 & LM 337 -> DC I just want to try how it's different about IC regulator and FET regulator.

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