Opamp Buffer Amp

Opamp Audio Amplifiers

Much has already been written about opamps and all the theory behind how they work. On this page I am going to give you circuit examples with maybe a little explaination so we can quickly get you on your way to building the amp you need.

In this first example I have designed a simple opamp using a single supply, in this case a 9 volt battery. The opamp is a dual voltage type that has a +V and a -V connection. In order to use a single supply a simple method is used. The +V connection goes to the +9V batt. connection and the -V connects to the -9V batt. connection. Next we have to place the opamp's + input midways between our supply voltages, to do this we use a voltage divider from the +9V battery to ground using 2 10K resistors in series. The point between these two resistors is connected to the + input of the opamp establishing a reference for the incoming audio signal source. If you were using a dual voltage supply this would normally be connected to ground on your dual voltage supply. C2 is a 33pf capactior. This is to stop oscillation should it occur.

This is a buffer amplifier. It has a gain of 0.

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