Cheap dual Voltage Power Supply

Thread Starter

SamR

Joined Mar 19, 2019
2,902
Just came in today and only took a few minutes to build. AC rectifier, LM317 & LM337 adjustable regulators, and filter/smoothing caps. No transformer but I am powering it with a 28-0-28 Triad VPL28-2000 transformer. Adjusts to well over +/-20VDC and with this XFMR has plenty of power. All of the resistors and caps were well within spec for a change. Not too bad for a $7 kit.
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The smoothing caps that came are 2200uF Nichicons with 0 ESR.
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Last edited:

upand_at_them

Joined May 15, 2010
630
Hi SamR. Do you have a link to the dual kit? The regulator heatsink pads look like rubber sheets instead of mica...not sure how much heat will transfer with rubber.
 
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