Power Supply Failure

Not every supply works as we would like.....

High Current 12 VDC Supply

This is a new power supply built from a transformer and rectifier (mounted on the aluminum heat sink) taken out of an industrial control-timer of some kind. The black transformer is a heavy duty winding that appears to be rated at over 11amps on the secondary. In this first use, we were able to drive 8 amps through an electrolyte solution of sodium bicarbonate and sodium chloride in a new electrolysis cell with four aluminum bar electrodes. Of course we had to test for flammability....

Tube B+ Power Supply

Assembled today from parts scavenged from an old PA system, an audio multiplex switch box, and a zip drive box; output of 325 VDC for tube projects.

Breadboard Prototype Box

This is a breadboard prototype box David constructed recently. Built out of an audio switching unit found at a yard sale, this experimentation platform will have three breadboards (one shown installed), a full array of voltage supply options from an external supply and a battery option off the strip in center (+/-3,5,12, etc), slider pots, switches, leds, current meeter, oscillator signal source, and more.

Power Supply for Audio Amp

David built this new supply over the weekend to power an audio amp based on the STM TDA7293 IC. With a peak output of 100 watts it's amazing what $5.78 can buy....I bet there is some profit margin left in consumer audio products...The supply provides +/- 30vdc for the amp plus other outputs.

Toroidal Transformer Power Supply

A new power supply David built with regulated 12 vdc and 5 vdc outputs.

Variable Power Supply

This weekend, as an additional project, David built the variable power supply shown in the photo. It delivers a continuously variable voltage from 1v to 17v by adjusting the silver potentiometer shaft.