Booster for electric guitar. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Musician
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The proposed design, the schematic diagram of which is shown in the figure, is used to change the color of the sound of an electric guitar. The sinusoidal signal in this device is limited to a signal close to rectangular pulses.
(click to enlarge)
The stage on the operational amplifier OZ1a of IC1, which has a variable gain, increases the amplitude of the input signal. Capacitor C13 suppresses the higher harmonics of the signal, passing the lower harmonics. Direct signal limitation is carried out using diodes D1-D4, included in the feedback circuit of transistors T1 and T2. With a lower gain of the input amplifying stage, the signal clipping will be less and vice versa. Tone color (content of higher harmonics) is regulated by potentiometer P3. The cascade on the operational amplifier OZ1b of IC1 provides a low output impedance of the device and the necessary signal level at its output.
This device is powered by a 9 V battery with a current consumption (without diode D6) of 1 mA. The TL1 type microcircuit, which has a low current consumption, was chosen as the IC062 chip. To control the state of the battery, as well as to ensure that the musician does not forget to turn off the device, a diode D6 can be connected to the power circuit, which should also have a low operating current.
Due to the small number of parts used, the device can be placed in any suitable housing. The voltage switch can be mechanically connected to one of the potentiometers.
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