This 20W amplifier was found in 283 circuits from the 90s. The MOSFET admits equivalents. The power supply must be dual, and the transistors must be mounted on good heat sinks.
We found this circuit in a transistor manual from the 1960s. The transistor is the Germanium...
This circuit that emits siren sound can be used in a fire alarm. We found it in an old American...
This circuit can be used in traffic alarm systems. The relay trips when the light falling on the...