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 generates signals of various frequencies and waveforms, making it useful on the...
We found this circuit in an old publication dealing with operational amplifiers. The circuit uses...
This filter for the scratching noise common in record players was found in Radio Electronics from the...