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Consumer Electronics by S. P. Bali

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GUITAR PREAMPLIFIER USING IC-LF536

The output signal level provided by many electric guitars is not high enough to overdrive a valve amplifier. This overdriving is an essential part of the final guitar sound. The preamplifier circuit shown here boosts the guitar signal so that the input stage of the guitar amplifier is guaranteed to clip. As an aid to this the gain can be selected between three and eleven times.

The layout of the circuit is very simple. A single LF356, Fig. 20.15 provides the amplification, which is decided by the ratio of (R2 + R3 + P1) to (R3 + P1). The input impedance, which, at 1 MΩ, is quite high, is defined by R1 as the op-amp has f.e.t. inputs. This is a suitable impedance for most guitar pick-ups. A 9 V battery provides ...

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