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 voltage-controlled oscillator or VCO has rectangular and triangular signal outputs. The...
This circuit was obtained from a 1965 Radio Electronics. The semiconductors used admit modern...
This Hall sensor circuit is intended to isolate an audio signal applied through a coil. The...