This circuit was found in the May 1984 issue of Radio Electronics magazine. It analyzes the exhaust gases emitted by a car. The circuit uses a special gas sensor from that time.
This circuit is from a 2001 publication. The balun transformers are of the commercial type for TV...
This circuit is from an old publication from the 1950s. The circuit uses germanium transistors but can be...
This amplifier, from the 1990 Philips Databook, is suitable for automotive applications. The...