We found the circuit of this Japanese transistorized commercial receiver in a documentation from the 1960s. It is a radio for the medium wave range with 6 transistors and 9 V power.
This high voltage switched generator circuit was found in a 70s American documentation. The...
With this 1-transistor circuit we have a high input impedance and good gain. The circuit is from a...
This wireless intercom has a range of about 300 meters using an integrated circuit that is not...