TTL Counter (CB21360E)

This counter from 0 to 9999 was found in English documentation. The power source must be 5V with at least 1A.

Simple Negative Comparator (CB24962E)
This basic voltage comparator circuit has a reference voltage given by a zener diode. The input...
Frequency switch (CB8095E)
This circuit was found in a Popular Electronics documentation from the 90s. It is possible to switch...
Optical Isolator and AC Trigger Power Switch (CB12414E)
This solid-state relay (SSR) or shield was found in a 1995 Electronics Now. The transistor can be...