I cannot understand how this circuit works

What is inductor's duty

I am not sure about dual zener mabe it can be a transistor

MOD: Lightened up your image.

 

Me neither, can we have the full picture?

 

Me neither, can we have the fill picture?

Looks like old American schematic with all the rails at the top - PITA!

 

I am not sure about the transistor and its pins. It also can be a mosfet or dual zenner. But i am sure about the circuit. Can be a protection circuit to switch on and off the supply?

 

Looks to me like some kind of sweep circuit. C27 is charged through a constant current source consisting of the transistor with 3.3 volts on the base. U33 discharges C27. The op-amp, along with the FET takes the triangular input voltage and converts it to a triangular current flow through the inductors. Perhaps an analog TV vertical deflection circuit?

 

Well the fet is drawn to the wrong supply, it should have it's Drain to +24V,

 

You are right. In your mind what is this circuit?

 

I think you've traced it out from a pcb, and it could be a Vertical Timebase module for an Oscilloscope , or Sawtooth generator, you might have drawn it wrong.

 

Your right. Its a exam. I am sure that i draw it right. Just I am not sure about the ttansistor

 

@53.411/-2.978 FWIW I agree with other posters saying it's some sort of multivibrator but I totally have to admit that schematic is tying my brain in knots!

 

@53.411/-2.978 FWIW I agree with other posters saying it's some sort of multivibrator but I totally have to admit that schematic is tying my brain in knots!

yes. It seems too strange

 

But I think its seems a circuit that switch on and off a voltage that is generated like a protection circuit by by command of FPGA by sensing for example voltage or current.

 

Hello,

Here is a slightly more readable drawing.

 

Hello,

Here is a slightly more readable drawing.

Hello,

Here is a slightly more readable drawing.

So whats your idea?? (Nc means that it has no connected and placed on Pcb boad)

 

So whats your idea?? (Nc means that it has no connected and placed on Pcb boad)

Hi,

I did not study the circuit yet just took a quick look and my idea is that you should get a better camera

Ok all i see so far is that they may have wanted to save money on the inductor so they used two smaller ones in series.
It could be a power supply although i did not look up any part numbers yet.

 

TS needs to confirm the source of the drawing. Was the drawing created by the TS by reverse engineering a PCB or was the drawing from another source?

 

Ok all i see so far is that they may have wanted to save money on the inductor so they used two smaller ones in series.

No, these are deflection coils, one top, one bottom (or one left, the other right). I reiterate my post #5.

 

TS needs to confirm the source of the drawing. Was the drawing created by the TS by reverse engineering a PCB or was the drawing from another source?

Hi. No it is drawn by reverse engineering a PCB.

 

Could be a power supply?? Voltage refrence 1.2 v create a -15 volt at positive pin of op amp and it is campared to the source voltage of mosfet then the mosfet is turned on.

 

No, these are deflection coils, one top, one bottom (or one left, the other right). I reiterate my post #5.

what is a deflection coil??