This commercial radio with 3 earphone listening transistors was manufactured in Japan in the 1960s. The medium-wave circuit uses germanium transistors and is powered by a 9 V battery.
We found this interesting bistable photoelectric control circuit in a 1988 documentation. The...
The integrated circuit used in this oscillator is no longer common in our market, as the...
This circuit was found in a 1970s documentation. The integrated circuit used is uncommon today....