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 sensitive electrostatic charge detector uses only common discrete components. The circuit can be...
This 9-pixel circuit has been implemented with 9 LDRs and can be coupled to a processing system for...
This is a well-known RC oscillator configuration using a 741 operational amplifier. The circuit is from...