This small regulated power supply was found in a 1963 General Electric documentation. The special zener diode transistor can be replaced with an equivalent discrete configuration.
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...