Using the LM383 this circuit was found in a Popular Electronics from the 90s. The source must be 14V and the integrated circuits must have good heat sinks.
This circuit decodes a 1800 Hz tone used in communications. The circuit is from an American...
These two circuits were found in Radio Electronics magazine from February 1960. The transistor is a power...
With the development and availability of small LCD screens for automotive use, especially in...