This circuit can function as an output shield for microcontrollers, being compatible with TTL logic. The frequency is adjusted in the trimpot. TTL power is 5 V.
This busy line indicator is very simple, serving for analog lines. The supply is made by two...
This circuit was found in an 80's Electronic Engineering. The circuit uses operatives of the time...
Other operational amplifiers series, such as the MC34072, MC34074, MC35071, MC35072, MC35074 d...