This circuit uses components that are still common despite being from 1995 documentation. The circuit can be powered by 6 to 12 V voltages and the speed of the LEDs' sliding effect is set to P1.
This circuit is suggested by National Semiconductor and is based on the LM3900, a quadruple...
This circuit for the radio amateur also includes the beep effect when changing. The circuit is...
We found this circuit in Radio Electronics from October 1968. The circuit drives headlight bulbs...