This circuit with 4 transistors can receive signals in 6 shortwave bands. The circuit is from a Radio Electronics from May 1958. The output is for high impedance headphones.
This astable was found in a European technical documentation from the 80's. The perfectly...
This circuit generates the busy tone of ordinary telephones. The transistors can be the BC548 and...
This is another one of the many sequential circuits that we have in this section and on the...