This commercial radio for the AM band was sold in Japan in the 1960s. The circuit has an IF of 455 kHz and is powered by batteries. The push-pull output gives a good audio power.
In figure 1 we have a circuit that turns on after a certain time and then turns off, also after a...
The figure shows how to implement an OR function with two inputs, using a relay. The relay...
This FM micro transmitter was found in an 80s spy book. The circuit can work with equivalent FETs...