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6 CommentsYpsilanti Michigan, USA

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  • hamjudo commented on leomiranda's instructable Variable Bench Power Supply4 months ago
    Variable Bench Power Supply

    I built something which is electrically similar, but the case was not nearly as nice. The case I used is too embarrassing for a photo here.I happened to have some laptop power supplies with bad connectors. I chose an old Dell 90 watt supply. It provides 4.7 Amps at 19.5 volts, which is well within the specs of the LTC3780. I had to solder on a new barrel connector and mating connector on my powersupply box. I put in a current limit potentiometer.I got my LTC3780 from a different provider. The circuit board looks the same, and the capacitors look the same. The capacitors have a maximum voltage of 35 volts. The LTC3780 and the other components can all go up somewhat higher.I replaced the internal current limit potentiometer with one that was accessible. The minimum value for the current ...see more »I built something which is electrically similar, but the case was not nearly as nice. The case I used is too embarrassing for a photo here.I happened to have some laptop power supplies with bad connectors. I chose an old Dell 90 watt supply. It provides 4.7 Amps at 19.5 volts, which is well within the specs of the LTC3780. I had to solder on a new barrel connector and mating connector on my powersupply box. I put in a current limit potentiometer.I got my LTC3780 from a different provider. The circuit board looks the same, and the capacitors look the same. The capacitors have a maximum voltage of 35 volts. The LTC3780 and the other components can all go up somewhat higher.I replaced the internal current limit potentiometer with one that was accessible. The minimum value for the current limit is almost an amp on mine, so that feature ins't quite as useful as I had hoped.My power brick is unswitched, so I plugged it into a switched power strip. The switch on the power strip is not as convenient, but it means I didn't have to do any mains level wiring.At low output voltages it can put out more than 10 amps. Next time I will go for a 20 amp meter instead of 10 amps.

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