Found in American documentation from the 1980s, this circuit prolongs the ringing of a doorbell or chime powered by a 6 V continuous voltage. The transistor can be a BD136.
This Signetics circuit uses a double 555 (556) to generate tone bursts at frequencies determined by...
We found this circuit in an English publication from 1980. It provides a logical output signal when...
This circuit sources a ramp signal with characteristic given by the diac. The circuit is powered...