Systems Engineering and Design!

Replies

• 

  Ankita Katdare

  Hi Nav,
  
  I believe you are supposed to reengineer the schematic from a given circuit.
  If it is fairly simple electronics circuit, you could just start drawing the various components as symbols on the paper.
  
  If it is a more complex one, you might want to refer this video -
  
  
• 

  Nav Phokela

  thanks ankita 😀
  if you know of any books or any other piece of information of how re-engineering works or looks like than that will be very helpful. the video is very good. But i think it focuses more on re-engineering then reverse engineering.
  I am doing this as systems engineering design course in australia. I believe your discipline is computer science right. If you have any followers who have an electronics/electrical engineering background could you please refer them to this post.
• 

  Ramani Aswath

  Is it not too late for March 24?
  
  I am not an electronics person. To me it looks like a heater control circuit. The 741 opamp appears to control the gate firing angle of the triac depending on the setting of the potentiometer RV1. It may be just an electronically controlled continuously variable heater supply. The rest of the gates may be to regulate the firing angle at the set point.
• 

  Nav Phokela

  sorry sir the due date has actually changed.
  so sir do you believe it may be some of sort thermostat that is controlling temperature ?
• 

  Ramani Aswath

  I do not see a temperature sensor in any feedback loop. This may be just a power regulator to adjust the output power of the heater using phase angle control of the triac gate using a potentiometer.
  Since the control input is analog the out put of the 741 appears to be modified by the rest of the gate circuitry to generate the trigger pulse to the gate of the triac. The circuit may also ensure stable firing of the gate of the triac for each setting of the RV1 pot. The transistor BC 158 just enhances the power of the trigger pulse to ensure proper firing.
  
  As I mentioned my knowledge of electronics is quite elementary. Others skilled in the area may help you better.
• 

  Ramani Aswath

  By the way, what is TH1 in the circuit? If that is a thermal sensor then the circuit may function as a thermostat.
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  Nav Phokela

  TH1 is a thermister sir
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  Ramani Aswath

  In that case the circuit will regulate the temperature of the heater.