This audio configuration of televisions from the 1960s was found in a Mullard transistor reference manual. Transformers are the critical components.
This circuit was found in National Semiconductor documentation from the 90s. The circuit uses two...
We found this circuit in the March 1984 issue of Radio Electronics magazine. The module used is a...
This circuit was obtained in an old Elektor and can be adapted to use white power LEDs. The...