Guitar Amplifier electronic circuit diagram

Published:2013/4/1 3:16:00 Author:Ecco | Keyword: Guitar Amplifier | From:SeekIC

The aim of this design is to reproduce a Combo amplifier of the type very common in the 'sixties and the 'seventies of the past century. It is well suited as a guitar amplifier but it will do a good job with any kind of electronic musical instrument or microphone. 5W power output was a common feature of these widespread devices due to the general adoption of a class A single-tube output stage (see the Vox AC-4 model).Furthermore, nowadays we can do without the old-fashioned Vib-Trem feature frequently included in those designs.The present circuit can deliver 10W of output power when driving an 8 Ohm load, or about 18W @ 4 Ohm.It also features a two-FET preamplifier, two inputs with different sensitivity, a treble-cut control and an optional switch allowing overdrive or powerful treble-enhancement.Technical data are quite impressive for so simple a design:Sensitivity: 30mV input for 10W outputFrequency response: 40 to 20KHz -1dBTotal harmonic distortion @ 1KHz and 10KHz, 8 Ohm load: below 0.05% @ 1W, 0.08% @ 3.5W, 0.15% at the onset of clipping (about 10W).



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