This windshield wiper timer was obtained in an 80's Hands On. The transistor can be the BC548 and the relay is 12 V sensitive. The time is set to R3.
We find this circuit in an old American documentation. It can provide a 25 dB compression in a...
This circuit is from a technical manual of the 80's. The operational ones are of the time like the...
This circuit was obtained from a Popular Electronics of 1994. The magazine no longer exists in its...