With the circuit shown in the figure, it is possible to connect or disconnect a load controlled by the relay by touching the sensors X1 and X2.
We found this circuit in an old Mullard (Philips) documentation on the 555 and 556 integrated circuit...
This adding amplifier with the operational LM324 is from the SGS integrated circuits manual of...
This divider by 6 is synchronized because it is implemented based on TTL or CMOS logic according to the...