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.
This circuit is from the Analog Devices component datasheet. In it we have the way to obtain a low...
This circuit was originally designed to maintain the temperature of a brooder at 41º C. However,...
This circuit is from an old documentation. Integrated circuit 723 is not common today. The power...