This circuit is from the 1992 Radio Electronics Handbook. The components used are from the period, with emphasis on the 2-digit display driver.
We found this configuration in the ON Semiconductor thyristor manual. The triacs depend on the...
This circuit was found in na old latin american magazine. The circuit uses two germanium...
In the figure we show how to expand the count from 26 to 32 with 4017 CMOS integrated circuits. The...