This 1988 circuit makes a back-and-forth of LEDs whose speed is controlled by P1. All components used are common and the circuit can be powered by voltages from 6 to 9 V.
This circuit, found in a Popular Electronics from 1992, is based on an oscillator and a crystal...
Home automation systems are becoming smarter and more connected with the launch of every new...
We found this circuit in a 90's Popular Electronics. The circuit produces a loud sound if S2 is...