This trigger produces an output pulse when zeroing the input signal. The circuit is from a documentation from the 70s, presenting a hysteresis of 100 mV.
We found this circuit in the May 1970 issue of Radio Electronics magazine. The maximum frequency...
We found this solid-state relay circuit that can function as a shield in a Radio Electronics...
This circuit was obtained from an English magazine from 1979, but can be easily assembled...