Input Impedance Of Op Amp Lm741 Is. They are also 741 op amps. While the lm741 does allow a tiny bit of input current 80 na and does not have perfect impedance characteristics these imperfections are usually negligible for audio circuits.
It may need a preamplifier. In this configuration the output signal is in phase with the input not inverted as in the inverting amplifier configuration the input impedance of the. An op amp can be used in two ways.
When input source is connected to inverting terminal pin 2 and feedback with the output pin 6 then the op amp is in inverting condition.
It is found that the input impedance for this op amp circuit is at least the that between non inverting and inverting inputs which is typically 1 mω to 10 tω plus the impedance of the path from the inverting input to ground i e. Here is simple op amp preamplifier circuit using lm382. The offset current and offset voltage of the ic 741 op amp is low. The voltage gain of the ic 741 is about 2 00 000.
