We found this circuit in the September 1985 issue of Radio Electronics magazine. It uses CMOS integrated circuits and is part of a larger integrated circuit test project.
This conventional astable multivibrator circuit with operational amplifier can be found elsewhere on...
Using red LEDs with ignition voltages of the order of 1.5 V we can make a multiple voltage...
This old circuit (1968) uses a germanium transistor to drive a relazy from a switch. The circuit...