This circuit is from a 1968 Electronic Design. The circuit uses transistors of the time that can be replaced with modern equivalents. More stages can be used to get higher tension.
The UVTRON tube is an ultraviolet radiation sensor. In this circuit from Radio Electronics from...
This circuit was found in a 90s Popular Electronics. The circuit uses components from that time,...
An stable multivibrator with 50% of duty cucle can be mounted using the 555 as shown by the...