GUITAR_TREBLE_BOOSTER

Published:2009/7/14 19:45:00 Author:May | From:SeekIC

The circuit diagram shown was designed to increase the treble content of an electric guitar's output. It boosts frequencies above 1 kHz and helps to restore any higher-frequency losses. IC1 is a TL071 op amp connected as a noninverting amplifier, which is connected in the line between the guitar and the main amplifier. Potentiometer VR1 determines the level of treble boost applied; with the values of components shown, it will give between 3 and 20 dB. Resistor R6 and the potentiometer VR1 could be replaced by a fixed resistor, if required. The actual boost frequency is set by the values of resistor R4 and capacitor C2. With switch S1 open, the circuit acts as a voltage follower, with no effect on the guitar signal. Closing S1 grounds C2 to the 0-V line, which introduces the boost. Resistor R5 holds the earthy end of C2 at 0 V when switch S1 is open, and prevents switching noise appearing on the signal when S1 is operated. Resistors R2 and R3 set the input impedance of the circuit at 50 kΩ, which should suit most electric guitars. If the circuit is housed in a diecast case, S1 can be a foot-operated switch and SK1 could be a stereo jack socket with the sleeve and ring connections connected to the battery negative and 0-V rail, respectively. Thus, the unit will switch on automatically whenever the guitar is plugged in. Connect the case for the earth side of the circuit. Expect reasonable life from a PP3 battery.



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