opamp related problem?

0 ⤊

opamp related problem?

when i connected -VCC supply on pin no. 7 of opamp IC lm741, the negative voltage reflects on input pin no. 3 of the IC. when i remove -VCC, the correct input voltage appears on pin no.3. but without -VCC amplification will not be possible. can anybody help me?

2007-02-16 17:34:40 · 2 answers · asked by Pulkit 1 in Science & Mathematics ➔ Engineering

2 answers

You need two supplies to drive a '741. A negative supply (usually between -12 and -15 volts with respect to ground) and a positive supply (connected, IIRC, to pin 7) of the same voltage magnitude and, again, wrt ground.

Do you have the positive supply connected?

HTH ☺

Doug

2007-02-16 17:45:49 · answer #1 · answered by doug_donaghue 7 · 0⤊ 0⤋

pin 7 is for the +Vcc. The -Vcc should go to pin 4

2007-02-17 08:15:06 · answer #2 · answered by genericman1998 5 · 0⤊ 0⤋