Test circuit with bridge (CB22530E)

This bridge-biased transistor test circuit measures gain in the range 0 to 300. Circuit is from Radio Electronics June 1952.

Digital CMOS Switch (CB16601E)
This bistable touch circuit using CMOS technology controls a relay. The supply voltage must be...
Machine gun (CB11961E)
This project is from the book Science Fair Projects by Newton C. Braga. In it we have a relay that...
Triggered sawtooth generator (CB7599E)
This circuit was obtained in an old documentation, but it is still current by the used components....