Hello,

I am trying to implement the circuit design shown below.

It is a circuit designed to help cut off voltage when electrochemical etching of a metal wire is over.

I think I understand the overall picture of the circuit, aside from some of the differentiator(boxed in balck)'s components I circled in black.

The potentiometer is to introduce a potential value change to the input of the flip-flop.

I am not sure what the capacitor and the switch is there for though.

(It's my first time asking a question so If I have unintentionally broken a rule, I apologize and will edit or take down the post)

 

It might be tricky from a first insight to know why those components are there. We don't know under what conditions the switch is open or closed. In a opamp based differentiator, usually, a capacitor is added in parallel with the gain resistor in order to stabilize the circuit at high frequencies. The pot might be there to have variable gain control.

 

I think Xavier made a good point.

 

Looks like they want it to be a timer , a R-C timer to 'clock' the flip flop. But it's a weird looking circuit. Or there are other parts not shown.