This two-digit digital pressure gauge was found in the 1992 special edition of Radio Electronics Experimenter. A/D converter integrated circuits are uncommon today.
This CMOS Flasher was found in a Popular Electronics from 1978. It can still be easily assembled, as all...
In the figure we have the suggestion of coupling an audio oscillator to monitor the CW...
This double bench source has a fixed voltage output and an adjustable voltage output with current up...