We found the circuit of this Japanese transistorized commercial receiver in a documentation from the 1960s. It is a radio for the medium wave range with 6 transistors and 9 V power.
This charger for a maximum current of 15 A was obtained from an American 80's schematics. The triac must...
This circuit is from the 1971 Motorola SCR Power Control Fundamentals. The circuit can be made...
This circuit, published in 1988, uses several types of sensors and relays to activate warning...