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 alarm uses several sensors that directly trigger a sensitive relay. A larger relay can be...
This circuit for counting down pulses was found in the September 1983 issue of Radio Electronics...
Indicated by Popular Electronics to be used with a car headlight, this circuit can also have...