We found this circuit in an old Mullard (Philips) documentation on the 555 and 556 integrated circuit (double 555). The relay must be 12 V with contacts that support the horn current.
In the figure we show how to supply a DC motor from 6 to 12 V with alternating current. The diodes...
This circuit was obtained in a 90’s documentation. The operational amplifiers are from that time....
When the remote connection is disconnected or interrupted, the lamp will come on. The transistors can be...