This circuit can be implemented with either TTL or CMOS logic. The speed depends on the logic used and the circuit can be used with microcontrollers, functioning as a shield.
This simple experimental circuit using only transistor produces a tone given by C1 and C2. Tone is...
This circuit, which can be used as a shield, was found in American documentation from the 1970s....
I This well-crafted circuit was found in an American documentation from 1975. The components are...