Relaxation oscillator using a Thyratron (T426E)

This oscillating circuit for a frequency of 588 KHz was found in a book on electronic designs with modern tubes.

Product Detector (CB22036E)
Intended for SSB and CW reception, this circuit was found in old English documentation. The...
Low Consumption Alarm (CB19226E)
Using two transistors, the resting current for this alarm is 25uA. The circuit was found in an...
Rain alarm (CB20776E)
This simple rain, leak or moisture detector circuit appears in other places on this site with...