This circuit can be used with 5 to 15 V sources and the zener diode must be chosen according to the trip voltage of the protector. The circuit blows the fuse when the voltage exceeds the zener value.
This amplifier is suggested by Sanyo and can excite loads of 4 ohms with a power of 4.5 Wrms. The...
This circuit was found in a 1967 RCA publication. The circuit uses components from that time, and...
This circuit with silicon transistors was found in a Radio Electronics from July 1965. The circuit of...