This circuit controls 6 LEDs in two sets with the phase change cycles controlled by a 555 oscillator. The circuit can be powered by voltages between 6 and 12 V.
This circuit is from a 90's Radio Electronics. The circuit operates accurately up to about 15 kHz...
This circuit is from a 1980s Signetics documentation but is valid for modern operating. Next to...
This circuit from a 1979 publication uses FETs which can be BF245 and integrated circuits, unlike...