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.
We found this circuit in the February 1970 issue of Radio Electronics Magazine. It uses an RCA...
This power source can supply currents in the range of 100 mA to 1 A, depending on the transformer and the...
This circuit consists of a constant current source for charging 12 V batteries. The charge is...