Thermostatic relay (CB21285E)

We found this circuit in an old QST magazine. The circuit is powered according to the thermostatic relay used.

Three Waveform CMOS (CB13743E)
This circuit was found in an English technical documentation from 1976. The supply can be done...
TTL to TTL Interface or Shield (CB15494E)
In the figure we have a circuit that allows to interface TTL logic with TTL logic, but with total...
Common Dimmer (CB5276E)
This dimmer, from an old publication, can use almost any triac and in shooting a neon lamp. The...