This circuit was found in the February 1980 issue of Radio Electronics magazine. The digital circuit was shown in two parts, using 20 LEDs in a configuration with the LM3914.
We found this circuit in a 1980s Linear Technology documentation. The components are from the...
This circuit was found in a 1970s American documentation. It can be applied to almost any...
This configuration was found in a publication for radio amateurs in 1975. It is a signal strength...