The circuit attached is used as an on/off switch to turn 60 ohms led on when v2 is below around 0.6V or below and to turn led 60 ohms off when v2 is above 0.6V. I have been trying for four months to do circuit analysis and to calculate hysteresis but I finally I admit I need help. Part of the problem is I am not sure where to start for circuit analysis and Q1 collector tied to Q2 base and resistor r5 also tied to Q3 collector is confusing me. Can someone please calculate hysteresis for the below circuit and go through the circuit analysis?
circuit analysis and calculating hysteresis attached circuit
- Thread starter hhsting
- Start date
Hello,
That circuit has been an intens discussion on AAC:
forum.allaboutcircuits.com
Bertus
That circuit has been an intens discussion on AAC:
circuit below what is purpose of r5?
The circuit below is used as an on/off switch to turn 60 ohms led on when v2 is below around 0.6V or below and to turn led 60 ohms off when v2 is above 0.6V. I have been analyzing the circuit for four months or so but cannot understand the purpose of r5 resistor. Can someone please explain to...
Bertus
Not the calculation it is not shown. I know what circuit is and hysteresis is.Hello,
That circuit has been an intens discussion on AAC:
circuit below what is purpose of r5?
The circuit below is used as an on/off switch to turn 60 ohms led on when v2 is below around 0.6V or below and to turn led 60 ohms off when v2 is above 0.6V. I have been analyzing the circuit for four months or so but cannot understand the purpose of r5 resistor. Can someone please explain to...
Bertus
Hello,
Perhaps the following page tells you more:
Bertus
Perhaps the following page tells you more:
Bertus
- Joined
- Nov 17, 2011
- Messages
- 14,271
Obviously this circuit has two states: on and off.
Start with V2 = 0 V to calculate an initial steady state of the circuit. Hint: Q1 = off in this state.
From that starting point you can find the point at which V2 turns on Q1, putting the circuit in a second state.
From this second state you can in turn find the point at which V2 turns off Q1, putting the circuit in a second state. This voltage should be less than the voltage that turns on Q1. The difference between these two voltages is the hysteresis.
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