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.

Touch Switch (CB11266E)
With this circuit we can activate a relay with a simple touch on the sensor. The relay can be 6 or...
Instrumentation AC Amplifier (CB12124E)
This circuit was obtained in a 1979 publication. The operational amplifier is of the type with...
Battery Tester (CB6517E)
Found in a 1980s German publication, this circuit tests batteries by type. The circuit is based on a...