This circuit for cars of the time was found in a Popular Electronics magazine from the 90s. The circuit is based on CMOS logic that is common even today.
In the figure we have the way to obtain an operational amplifier with FETs at the input, using a...
This circuit was found in a 1980s documentation. The low voltage circuit uses a PUT. Transistors can...
This circuit shows numbers I II and III when mounted on its side, depending on the position of the...