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.
High stability is the main feature of the 10 V regulator circuit shown in the figure and suggested by...
This circuit, from the Texas Instruments component datasheet, allows the switching current to be...
This circuit was found in a 90s Popular Electronics. The circuit indicates if a transmitter is working,...