Actually I'm not trying to critique my or anyone's homemade bench PSUs but if you want to, go ahead. This is just meant to be a picture gallery of homemade tools 
This is my low power bench PSU that I use for charging batteries or powering whatnot. It's a CC/CV design, 1.2V to ~14V. Analog meters. The pots on the side are the current and voltage limits, banana jacks and meters are on the front. It's a LM317T reference design except I used parts I had on hand.
The main rectifier is that TO220 in the upper right corner just underneath the white meter (current). Black meter is for voltage. Between the two meters is an LED that lights when it's current limited. The circuit board with the op amp and LM317T is ghetto attached (it's just hanging there...). The main pass transistor is underneath the bulk capacitor somewhere mounted on that thick metal aluminum heatsink salvaged from a dead ATX PSU (quite possibly from the same one that this case was borrowed from).
Yes, that's a fan attached out the back.
This is definitely a hack job and I've killed the pass transistor on the bottom due to overheating (I should have designed it so that I can swap out the transistor more easily, or even better, used something beefier than a TIP42), alas this bench PSU has been one of my most often used tools in my arsenal.
This is my low power bench PSU that I use for charging batteries or powering whatnot. It's a CC/CV design, 1.2V to ~14V. Analog meters. The pots on the side are the current and voltage limits, banana jacks and meters are on the front. It's a LM317T reference design except I used parts I had on hand.
The main rectifier is that TO220 in the upper right corner just underneath the white meter (current). Black meter is for voltage. Between the two meters is an LED that lights when it's current limited. The circuit board with the op amp and LM317T is ghetto attached (it's just hanging there...). The main pass transistor is underneath the bulk capacitor somewhere mounted on that thick metal aluminum heatsink salvaged from a dead ATX PSU (quite possibly from the same one that this case was borrowed from).
Yes, that's a fan attached out the back.
This is definitely a hack job and I've killed the pass transistor on the bottom due to overheating (I should have designed it so that I can swap out the transistor more easily, or even better, used something beefier than a TIP42), alas this bench PSU has been one of my most often used tools in my arsenal.
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