This circuit was obtained from a 90s Radio Electronics. The value of R1 determines the scale according to the table next to the diagram. The power suppley must be symmetrical.
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...