On 30/12/2024 08:46, Jeff Layman wrote:
Anyone remember an electronics "surplus" shop in Reading in the 70s? I
bought an old power supply there (which weighed a ton) to turn into a stabilised supply useful for charging my car's dodgy battery. It had
eight OC26 transistors on four large heatsinks and a couple of umpteen thousand uF smoothing caps. I modified it using a Wireless World circuit
and it worked well for years, even after one of the smoothing caps died.
It eventually went for recycling only a few years ago.
I designed/built my own, using a toroid transformer. It would pulse
charge - It would turn on, pulse a charge, turn off, and check the
battery volts, which determined how long the next on pulse would remain
on for. Current when on, was 20 amps. It worked very well, and would
rapidely be able to start a car, from a flat battery, or top a battery
up, without over charging.
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