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).
This circuit can be used as a shield for transmitting the temperature of a sensor. The circuit is from...
We found this circuit in an old manual. The bypass range is 20 MHz and the power supply must be...
This small audio amplifier uses germanium transistors and a 12 V supply. The circuit is from a...