Tr3 is implemented in a standard VCA that also includes R6 and R7.Ĭ1 and C2 serve as DC blocking capacitors, while C6 serves as a supply decoupling capacitor. Slowing down the rise time of the modulation signal produces a somewhat better output audio, and this is accomplished by inserting a simple R/C low pass filter (R5 and C3) between the astable output and the Tr3 gate.
The MOSFET IRF540 can be replaced with any low power MOSFET such as BS170 etc
This sort of circuit is identical to a tremolo circuit in many respects, however the modulating signal is almost always a squarewave.Ī straightforward astable multivibrator constructed around Tr1 and Tr2 provides the modulation signal in this example.ĭue to this, a mark space ratio of somewhat lower than 1:1 appears to produce the best outcomes, and also C4 and C5 may not be of identical values, as they might be in a “coursebook” astable. The figure below shows a circuit that may be used to generate computer-like or robot like voice effects for community theater plays, or other similar applications.
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