Found in the March 1992 Radio Electronics magazine, this circuit has two supply voltages. The maximum input voltage is 14 V.
This interesting circuit, which can be used as an alarm, was found in a 1997 documentation. It...
In the figure we have the 4047 application-circuit which consists of the monostable version in...
With this circuit it is possible to excite direct current relays from an alternating signal,...