This circuit was found in an English documentation from the 90s. It uses a PLL CMOS 4046 and is powered by a 9 V battery. The sensors are two electrodes that must be held by the person.
This circuit was obtained in a 1975 documentation. It is intended for old vehicles that still use...
A Schmitt trigger inverter can be obtained from each gate of the 4093 with the connection shown in the...
In the figure we have a typical voltage follower. In a voltage follower the voltage gain is...