This bargraph circuit using LM3914 was found in the October 1980 Radio Electronics magazine. Note the use of a transistor to modify the response.
This circuit was found in a 1977 Radio Shack documentation. The unijunction transistor can be...
This circuit was found in a September 1987 Radio Electronics. The current through the switch is...
The integrated circuit of this project is not very common. The circuit is from 2003. This circuit is...