I'm trying to reverse engineer a PCB and made a schematic.
The bad thing is I only have PCB images from both sides, not the actual PCB. This PCB is used to detect a very small black object spinning at the speed of 23000 RPM.
I need to know the following things about the schematic:
- Can any one help me to learn the working of this circuit? I know bottom one is inverting Operational amplifier but I don't know about the upper one.
- The opamp IC is an LM324A and they are running it on 1.65V. Is it possible to run it at 1.65V? The suggested voltage for the IC is more than 3V.