modified 9 years ago

Floated circut - unexpected

00:26:19

The reason to have added diodes is to protect ICs from reversing voltages. Then, this circut became to work without connection to GNG. I don't know why it dose, or why the voltage is fixed to this level.

published 9 years ago

hurz

9 years ago

Yes interesting, anyway change one diode parasitic capacitance from 5 to 4.99pF and restart sim ;-)

FitFat

9 years ago

Thanks, hurz. This was related to the capacitance of diodes, wasn't it. So, This circut is likely floated, but VCCs of op-amps are not. When the signal level is out of VCCs, this cannnot amplify it. ...By the way, I've just known this base level is shifting slowly. It can be discribed as charging to these capacitances, may be....

ArpitDhole

9 years ago

Not need to teach it

FitFat

9 years ago

I wanted to let me know if someone have known it. It's my first trouble after beginning to use this application why the floating instrumentation amplifire dosen't work.

FitFat

9 years ago

This might be a reason it works ( http://everycircuit.com/circuit/5250954145824768 ).

FitFat

9 years ago

Additionally, one like this works too ( http://everycircuit.com/circuit/5634150188449792 ).

FitFat

9 years ago

:-) and because this is a floated circut ( http://everycircuit.com/circuit/5016130030141440 ).

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