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 is a very simple continuity tester, powered by one or two batteries of any size. The...
Tone controls for audio applications can also be considered filters that must attenuate certain...
This simple neon alternating flashing circuit was found in an old American publication. The...