modified 12 years ago

Can anyone make this op amp work

01:22:50

No solution 

published 12 years ago

pip

12 years ago

Place a switch on the ov line start circuit with switch open then close. Limitations of The simulation software it especially doesn't play well with pnp transistors in opamp configuration. It can't seem to decide what happens at power on which transistor should begin to conduction first. There are other things to do but that's the simplest i am can think of.

Voltransistor

12 years ago

Thanks! You really helped, I don't know why but I never thought of that. Thankyou.

UncleRick

12 years ago

This may not be the proper way, but I found by removing the ground from between the power sources, the circuit seems to work. Perhaps this is indicating an improper ground or biasing elsewhere in the circuit.

Commodore64

12 years ago

Increase the value of the output resistor to 10M. The problem seems to be a massive current running through the OPA which causes an numeric overflow at startup. Reducing the output current helps. The very same problem occures with the ready zo use OPA. Here reducing the load on the output and/or reducing the sensitivity helps.

Voltransistor

12 years ago

Thanks

YuHan

12 years ago

maybe the ibias is too small ,change 50k res to 2k

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