Operational amplifiers (Op−amps) have developed from circuits designed for the early analogue computers where they were used for mathematical operations such as adding and subtracting. Today they are widely used in integrated circuit form where they are available in single or multiple amplifier packages and often incorporated into complex integrated circuits for specific applications.
Buffer amplifiers are a commonly encountered, specialised amplifier type that can be found within any of the above categories, they are placed between two other circuits to prevent the operation of one circuit affecting the operation of the other. (They ISOLATE the circuits from each other). Often buffer amplifiers have a gain of one, i.e. they do not actually amplify, so that their output is the same amplitude as their input, but buffer amplifiers have a very high input impedance and a low output impedance and can therefore be used as an impedance matching device. This ensures that signals are not attenuated between circuits, as happens when a circuit with a high output impedance feeds a signal directly to another circuit having a low input impedance.
I very much enjoyed my time with this particular amplifier, but thesound quality of these modules will obviously depend on the powersupply that is going to be used with them. The amp as it was availableto me did sound very good for the money and is very powerful ontop of that. Resolution and speed could perhaps be a bit better, butoverall this is a very enjoyable amplifier and I can only recommendit.