Thanks for simplifying the schematic, it makes it easier to understand. I made a new schematic with the help of the one you made:
I would expect the 1500uF to be on the input and 150uF on the output of the regulator. The collectors of the phototransistors should connect to the regulator output. The phototransistor emitters go via resistors to ground and to each pole of the switch. You have the two poles of the switch linked when they shouldn't be. One of the millivolts terminals goes via a resistor to the pole of the switch and the other goes to ground.
Sorry I don't get you, I drew the 10k pot both times the same. Do you mean theft hand side of the milivolts probe above? That would be strange because the plus side of the millivolts probe has a 1k resistor attached in real life, so i wouldn't change that.The 1k resistor wouldn't affect the measurement. I suspect it is there to protect the phototransistors if the meter terminals were shorted.
The circuit around the transistor is wrong. You had it right earlier. The left hand side of the pot should connect to ground instead of +12V and the collector of the transistor should connect to +12V.
Yes I see it now, I will change it. But why ground the base?Look at the connections around the transistor below.
Correct version:
View attachment 113114
Latest Version:
View attachment 113115
If you must detect that the difference lies between two values then you need a 'window comparator' (comprising essentially 2 comparators with different respective reference voltages).how does the comparator know that when he see's a higher voltage (between 0.01-0.05v) at Vin, that he should do something?
Ok, I made a window comparator schematic to detect the voltage difference I want:If you must detect that the difference lies between two values then you need a 'window comparator' (comprising essentially 2 comparators with different respective reference voltages).
Yes, to make it clear this is what the old test box does:Do I understand correctly that you also need to measure the actual voltage on FC1 or FC2?
If so how is this arranged with this circuit?