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 was found in the September 1974 issue of Radio Electronics magazine. It consists of a...
This circuit was found in a 1995 documentation, eventually requiring two resistors in series with...
This amplifier was found in Burr-Brown documentation from the 90's. The gain can be programmed by resistor...