This an old commercial receiver found in a year 1958 magazine. The circuit uses some transformer available that timer and the transistors are germanium types. The circuit is intended to receive MW stations.
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...