This is the circuit of a modified Heathkit kit. The circuit was found in a Radio Electronics from December 1965. The author of the circuit included improvements to the original circuit.
Found in a 90s Popular Electronics this circuit has its gain given by R2. This component can be...
This circuit was obtained in an English publication of the 80's, finding applications in...
This circuit was found in a 1977 Radio Shack documentation. The circuit is TTL, which must be...