This FM receiver tuning step circuit was found in a 1960 documentation. No information about the coils is given, but the FI used at the time was 10.8 MHz.
This interesting comparator circuit was found in an old Motorola documentation. The integrated circuit...
This transistorized shift register was found in a 1970s RCA documentation. The used transistors can...
We present a commercial circuit for a small amplifier (CF-401) sold in Japan in the 1960s. The...