modified 11 years ago

Op amp as a adder

00:48:20

The sum of two voltage sources is appearing at the feedback resistor but with negative voltage

published 11 years ago

hurz

11 years ago

Sorry, just wrong. Never use an OpAmp with positiv feedback only if you expect linear behaviour. Try to calc 10V + 6V its -15V ok, because its clipping. But now calc 10 + 4V which suppose to be -14V, right? But its still -15V because its actually a schmitt trigger and not a linear calculating circuit. Flip plus and minus terminal and this circuit is working fine. Hope this helps.

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