The tremolo effect is generated by a repeating volume change at a rate usually between 1 and 15Hz. The timer produces a low frequency square wave that is smoothed by a simple rc integrator. This varying signal modulates the signal input from the instrument. Transistor Tl is used as a voltage controlled resistor. The output of the circuit is connected in parallel to the output of the instrument.
Electronic-tremolo - schematic

Potentiometer P1 provides depth control by adjusting the amplitude of the modulating waveform applied to the instrument. The rate contrul frequency is set by potentiometer P2.

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