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 power supply circuit was obtained from the February 1993 Radio Electronics magazine. The...
This circuit is from a 1972 German magazine Funkshau. The circuit can use BC548 transistors...
We found this circuit in the La Radio per Tutti magazine in Italy in 1926. The coil can be made...