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.
Only for reference this is a circuito f a commercial receiver of the year 1958. The circuit uses...
This modulator for analog video signals was found in a 1980s Motorola documentation. The circuit...
With a 1 500 uFcapacitor this timer can reach times up to one hour. The capacitor must be of good...