Using 5 V relays, this circuit can be used as a control shield for microcontrollers. The circuit uses relays, and the motor voltage is independent of the control voltage.
Found in a 1968 American documentation, this circuit generates 1 kHz signals. The SCR used is not a...
This circuit with bass and treble control and 10 W of power per channel is from the SGS manual of...
More modern operational amplifiers can be used on this instrument to measure alternating voltages. The...