This receiver was found in a Japanese publication in 1967. The circuit uses germanium transistors and details of the coils are not given. Power is supplied by a 9 V battery.
This amplifier can work with voltages between 12 and 22 V. This means that we can use it in the...
When pressing S1, S2 or S3 this circuit generates different tones for a tone-modulated...
The configuration shown in the figure uses two NPN transistors activating the load when the input...