This bargraph circuit using LM3914 was found in the October 1980 Radio Electronics magazine. Note the use of a transistor to modify the response.
The circuit shown in the figure was suggested by National Semiconductor in its 1994 Linear...
This circuit can be controlled by an LDR causing an LED to flash at a frequency given by C2. The...
This hybrid power supply circuit was found in the August 1997 issue of Electronics Now magazine. The...