Position: Index > Unclassified >

Zero Gain Mod For Non-Inverting Opamp(NE5532)

2017-08-06 18:03  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.

This article briefly describes the Zero Gain Mod For Non-Inverting Opamp (NE5532). This principle is easy to understand, but also very practical. Depth understanding of circuit elements, can be more effective to grasp this principle. Do you know the circuit, for example, can understand and buy these components: NE5532 .

Electronics textbooks will tell you that a non-inverting opamp normally cannot be regulated down to 0 dB gain. If zero output is needed then it is usual to employ an inverting amplifier and a buffer amp in front of it, the buffer acting as an impedance step-up device. The circuit shown here is a trick to make a non-inverting amplifier go down all the way to zero output. The secret is a linear-law stereo potentiometer connected such that when the spindle is turned clockwise the resistance in P1a increases (gain goes up), while the wiper of P1b moves towards the opamp output (more signal). When the wiper is turned anti-clockwise, the resistance of P1a drops, lowering the gain, while P1b also supplies a smaller signal to the load. In this way, the output signal can be made to go down to zero.

Circuit diagram:

Figure:1 Zero Gain Mod Circuit Diagram For Non-Inverting Opamp

Figure 1 Zero Gain Mod Circuit Diagram For Non-Inverting Opamp



Reprinted Url Of This Article: