This circuit is placed between the instrument pickup and the amplifier input. The same version can be found from other sources in this section. This is from an English magazine from the 80s.
In this circuit the photo-transistor signal is amplified by a Darlington step and then applied to a...
This circuit makes simultaneous control of two up to 150 W incandescent lamps. The circuit is half wave...
This circuit uses an integrated CMOS having the frequency determined by the resistors and...