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 charger can be used with one to four AA, AAA, C or D cells. The maximum current is given by R...
Using an RCA CA3035 integrated circuit, this turntable circuit was found in the February 1970...
This circuit uses an unusual Motorola voltage reference. Other manufacturers also provide this...