This circuit was obtained in an old Popular Electronics. It makes use of quite common components. The speed of the effect is set to R7. The circuit drives 20 LEDs.
This circuit for 6 lamps was found in old American documentation. The supply is of high voltage...
The integrated circuit used in this regulator is not very common today. The circuit is from old...
This circuit uses a triac to detect the level of a reservoir, and a sensitive SCR connected to the...