This 3-step circuit for generating digital signals was found in the November 1976 issue of Radio Electronics magazine. The maximum frequency depends on the flip flops.
T The modern equivalents of the transistors used in this 1980s setup are BC548 or even BC547 and...
This circuit is indicated for the control of resistive loads. When S1 is opened, the triac turns on...
This circuit is from a 1957 Japanese magazine, showing the use of OC19 in a high voltage inverter. The...