This circuit is from the 1992 Radio Electronics Handbook. The components used are from the period, with emphasis on the 2-digit display driver.
This circuit was found in the November 1993 issue of Electronics Now magazine. It uses...
This circuit was found in a Popular Electronics from the 90s. The effect circuit uses components...
In the circuit shown in the figure, when the input voltage rises to 27 V, the TL431 triggers the...