modified 8 years ago

ADC Input protection clamping.

01:09:37

ADC Input protection clamping.
0-30VDC -> 0-2.5VDC 

published 8 years ago

BillyT

8 years ago

There is no visible benefit to this circuit.

hurz

8 years ago

Horrible schematic. However, it does work fine. Voltage above 30V is clamped at around 3.2V (100V test voltage). Negative voltage is even better, cuz of the extra offset diode voltage. Only the ADC range 0 to 5V is very non linear and almost unuseable or need extra compensation within software. But please make it a little nicer and give it a little explanation. Improvement might be an offset like for the negative side with one diode threshold.

BillyT

8 years ago

@hurz, redrawn the circuit, but I'm not smart enough to work out what it is doing, please give me a hint; http://everycircuit.com/circuit/6193711011856384

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