The circuit presented is a Japanese commercial radio for AM with 50 mW of output power, powered by 9 V. The circuit is from the 60s, having been found in documentation of the time.
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...