This circuit, found in a 1958 magazine, is for reference only, since the components are not easy to find today. The transistors are germanium types and power supply is made by common cells.
This time base circuit for the oscilloscope was obtained from an Electronics Now from the 90s. The...
This relay time delay circuit was found in the October 1993 issue of Electronics Now magazine. The timing...
RF or even switching transistors like the 2N2222 can be used in this circuit. The capacitors are ceramic...