Micro metronome (CB20743E)

This simple CMOS metronome circuit can be mounted in a small box, providing both sound and light sources.

5 to 15 V x 50 mA Converter (CB26058E)
This circuit is based on the DCP010515 integrated circuit found in the August 1998 issue of...
Zener diode test (CB7958E)
Found in a 90s Popular Electronics, this circuit aims to find the voltage of a zener diode up to...
100 V x 400 mA Regulator (CB17035E)
The transistor used in this circuit is uncommon today, but equivalents can be used. The zener...