Found in 90s Radio Electronics, this shield can control high voltage loads in the power grid. Isolation is guaranteed by the use of an optical coupler.
This signal follower is from a 1970's documentation. So it uses the traditional configuration at the time...
This bistable touch circuit using CMOS technology controls a relay. The supply voltage must be...
We found this circuit in a 1986 publication. However, as it is based entirely on 555 integrated...