What is the function of primmer potentiometer in op-amp inverting configuration????

Question

Related to electronics

Answer 1

In both the inverting and non-inverting operational amplifier cases, the potentiometer would serve to adjust the gain.

For the inverting case, the gain is equivalent to:

-(R_f/R_in)

where the potentiometer would represent R_f because R_in is defined as the internal resistance of the amplifier. With a fixed R_in, adjusting R_f would result ina change in gain.

For the non-inverting case, the gain is equivalent to:

1 + (R_1/R_2)

where R_1 would represent the potentiometer. Again, with a fixed R_2, altering R_1 would result in different gains.

Below are links to show the circuit diagrams of both cases

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Hope this helps

Answer 2

Surely you mean trimmer rather than a particularly decorative potentiometer? It depends on the circuit but for an inverter the most useful thing would be to adjust the gain.

Answer 3

I think trimmer is more appropriate for small variable capacitors in radio tuning circuits. As for small variable resistance(small potentiometer), it is called presets and usually mounted directly on the PCB.
My understanding is that presets are used inside the equipment for limiting the amount of adjustment (may be gain, loudness, intensity) for the user. Usually adjustments outside the equipment can be made by user without damaging the equipment.Such as volume of TV set. MP3 player,temperature of instant water heater etc.

Answer 4

Depends on the specific circuit configuration. Gain? Could be. Most times, though, it's there for offset nulling purposes.