/diy/ - Do It Yourself

Anonymous Thu Oct 26 23:21:23 2023 No.2702023 [View]
File: 97 KB, 1896x766, moron circuit.png [View same] [iqdb] [saucenao] [google]

>>2701985
>it doesn't work
fug

Ok so there's two parts to the circuit, one is the current source (Q1,2, U2A, resistor networks), the other is the battery cutoff circuit (U2B, Q3). Firstly, the battery cutoff circuit doesn't latch on. Even though the divided battery voltage is higher than the 1V divided reference, the FET somehow turns off as soon as I take my finger off the button. Gotta scope that to find the issue later.
Secondly, while the current source seems to work at 10mA, for both the 100mA and 1A settings it falls drastically short, getting only up to 36mA and 40mA respectively. Also the divided voltage reference drifts up from ~1V to ~2.5V on these higher current settings, no clue what's going on there.

Knew I should have used a PFET.

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/diy/ - Do It Yourself

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