This mono circuit for 10 LEDs was found in the January 1991 Radio Electronics magazine. It is powered by 12 V.
The LM1468L can also be used. The circuit is from Motorola's Linear Interface ICs and the...
We found this light-effect circuit with LEDs using the well-known 4017 in a 1987 documentation. All...
This circuit was found at Popular Electronics. The speaker is of the greater than 100-ohm...