Monday, July 18, 2011

Guitar Pre Amplifier using TL072

The following diagram is the circuit diagram of guitar pre-amplifier. The circuit built using dual op-amp circuit which is already included in IC TL072
Guitar Pre Amplifier using TL072

Guitar Pre Amplifier circuit notes:
  • IC pinouts are industry standard for dual op-amps. Pin#4 is -ve supply, and pin#8 is +ve supply.
  • Diodes are 1N4148, 1N914 or similar.
  • Op-amp supply pins must be bypassed to earth with 100nF caps (preferably ceramic) as close as possible to the op-amp itself.
  • Pots should be linear for tone controls, and log for volume and master.

Guitar pre amplifier circuit source:

About Audio Amplifier
An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 - 20 000 Hz, the human range of hearing) to a level suitable for driving loudspeakers and is the final stage in a typical audio playback chain.

The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification, equalization, tone control, mixing/effects, or audio sources like record players, CD players, and cassette players. Most audio amplifiers require these low-level inputs to adhere to line levels.

While the input signal to an audio amplifier may measure only a few hundred microwatts, its output may be tens, hundreds, or thousands of watts. More explanation about power audio amplifier can be found at

This is a video tutorial about how to a very simple audio amplifier based on the LM386 amplifier chip. It can be built for less than $20 (or might be less than $8 in some countries) and used to amplify any low level audio signal including a guitar, bass or mp3 player.

Watch the video:

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