This circuit was found in a 1967 RCA manual. The transistors are of the time. The adjustment is made to read 7.15 V on the charged battery and the charging current is 3.2 A.
We found this circuit in a Japanese documentation from the 1960s. The frequency depends on the...
This is a diagram of a 1958 commercial receiver. The circuit was found in documentation at the...
This circuit can have its output configured by choosing resistors R1 and R2 according to the...