This speaker overload protection circuit was found in Radio Electronics from the 1980s. The circuit uses a 9 V relay but can be powered by 12 V for a relay of this voltage.
This circuit was obtained from an English magazine from 1976. The signal from the circuit should be...
This circuit of a good amplifier for domestic use is from the Philips Databook of 1990. The...
This circuit indicates the current of a motor or other load. Resistor R has values between 470 ohm...