We found this tube receiver in a 1950s Japanese publication. The circuit uses 5 tubes and has an RF amplifier stage for greater sensitivity. The power supply is not shown on the circuit.
This game was found in an old Popular Electronics. The unijunction transistor can be 2N2646. The...
This circuit monitors the current in the loads. The NPN and PNP transistors admit the BC547 and...
We found this digital timer circuit in a 1994 publication. The power is supplied by 12 V, which is the...