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 covers 400 kHz to 40 MHz in three bands according to the selected coil. The double...
Two sensors are used in this simple remote-control circuit, one to switch on and one to switch off the...
This circuit is from the Motorola Linear Databook published in 1990. The circuit for 1 kHz can be...