This analog instrument circuit was found in a 1990s William Sheets. The components are common and are only suitable for cars with mechanical switching (platinum).
The NCX2220 circuit from NXP consists of a voltage comparator with low supply voltage and can...
This 3-decade operating range VCO was found in a 90s Popular Electronics. The circuit uses...
This circuit controls a fan in the car, according to the temperature, activating it automatically when the...