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 controls two lamps so that when one increases in brightness the other decreases. The...
We found this circuit in an Argentine documentation from 1973. The transistor admits a more modern...
This circuit was obtained from a 1998s Popular Electronics. The magazine no longer exists, but the...