Found in the December 1974 issue of Radio Electronics, this circuit is similar to the previous one, only using another TTL counter. The circuit must be powered by 5 V.
Older cars and some modern models do not have an audible direction indicator. This simple circuit can...
This circuit works as a useful field meter for radio amateurs. We found it in documentation from...
This indicator makes use of an LM339 voltage comparator circuit that contains 4 internal...