I have built an instrumentation amplifier using an LM348N quad op amp, supplied with ±9V. A simulation of the circuit is done as in the link - Simulation:
But when I connect the circuit accordingly, there is no variation in the output voltage as input is varied. The input differential voltage varies when I probe the non inverting terminals of the op amp, but I don't see any variation when I probe across the inverting terminals and the outputs of the op amps respectively. What am I doing wrong?
I have built an instrumentation amplifier using an LM348N quad op amp, supplied with ±9V. A simulation of the circuit is done as in the link - Simulation
But when I connect the circuit accordingly, there is no variation in the output voltage as input is varied. The input differential voltage varies when I probe the non inverting terminals of the op amp, but I don't see any variation when I probe across the inverting terminals and the outputs of the op amps respectively. What am I doing wrong?
I have built an instrumentation amplifier using an LM348N quad op amp, supplied with ±9V. A simulation of the circuit is done as in the link - Simulation:
But when I connect the circuit accordingly, there is no variation in the output voltage as input is varied. The input differential voltage varies when I probe the non inverting terminals of the op amp, but I don't see any variation when I probe across the inverting terminals and the outputs of the op amps respectively. What am I doing wrong?
