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Article #34Re: power supply circuit
From: rebel
Date: Tue, 10 Jun 2008 01:32
Date: Tue, 10 Jun 2008 01:32
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2519 bytes
On Mon, 9 Jun 2008 07:55:58 -0700 (PDT), MooseFET <kensmith@rahul.net> wrote: >On Jun 9, 5:42 am, F Murtz <hagg...@hotmail.com> wrote: >> I would like to make an adjustable power supply using a transformer with >> a 24v 5a single wound secondary I would like the voltage to be >> adjustable from lowest to highest possible given transformer I would >> like to have regulated current >> >> There is another possibility I also have a larger transformer with two >> 32v 4.7a secondaries If anyone has a schematic for an adjustable power >> supply with adjustable current regulation making the most of the >> transformer specs I would be eternally grateful > > >How much current do you want? > >Lets just assume you make DC from the AC and then regulate down. > >Doing a couple of figures for making 4A into lets say zero volts: > >24V * sqrt(2) = 34V > >34V * 4A = 136W > >The the regulator circuit needs to get rid of 136W. Minor points - the transformer isn't rated to deliver 136W, and that 34V is unloaded peak.
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