This interesting circuit for analog TV selects the first line of a frame. The circuit was found in a 1967 Electronic Design. A modern equivalent transistor can be tried.
This one-digit photometer using CMOS circuits was found in a 1989 documentation. The circuit is...
The presented circuit generates signals in a 1:10 frequency range depending on the Ct capacitor. See the...
This circuit, from a 1988 publication, consists of a timer that activates a relay at the end of a...