Other versions exist on this site from various publications. This one is from the Radio Electronics Experimenter from 1990. The bargraph circuit uses the UAA170.
The LM11 operational amplifier is not common today. The circuit was obtained in the Linear...
Only one LED is turned on when S1 and S2 are pressed. The LED that will be on is just the...
This is one of the first transistorized receivers (2N107) published in the Radio Electronics...