We found this circuit in a 1967 RCA SCR manual. The circuit uses components from the era. The bridge diodes must withstand the current of the controlled load.
Figure Bellow shows how to use a 7490 (TTL) IC to divide the frequency of a TTL signal by 6; The...
This circuit was obtained in an old US 1974 documentation when Nixie tube displays were common. The...
This source draws a fixed constant current of 1 mA using a Norton operational amplifier. Other...