Commonly, car headlights are triggered with relays. I'm fine with that, but, I just dislike the way the contacts wears out over time.
Solid State Relay (SSR) are already in the market, but tend to be quite pricey.
About five years ago, I'm using my PC as signal generator, and this speaker amp to drive a transistor, which is then driving an ignition coil. I'm using only the left-channel at that time.
While having fun, for maybe about 3 months, boring with just 12V supply, I tried 24V. It ran for few minutes, then, ..., silence... I blew my amp! Feeling guilty, I decided to stop play with it for a while.
Listening music with only my right ear for quite some time, I decided to play with it again.
And yes, now the both of the channels are burnt!
With some few limited spare time, I try to revive it back.
In previous post, I said I want to build an opamp circuit to amplify the TPS signal by x3. The TPS requires 5V to be applied. Rather than just take a common LM7805, I thought, I prefer to have an adjustable PSU.
So, here we go!
I'm too lazy to make my own PCB, so, a basic kit would be nice.
The subjected case.
Cutting perfboard for the pass-transistor.
Drilling hole for heatsink.
Hole for the pot.
View from above.
Backside of it.
Powering a load.
Yeah, I know I've done a blog post before on modding PC PSU as bench PSU, but, I don't really like the metal nature of the housing.