We found this circuit in the November 1992 Radio Electronics magazine. The circuit uses an LDR as a sensor and the transistor can be any general-purpose transistor.
This circuit was found in the February 1990 issue of Radio Electronics magazine. The gain is given...
This 90's project shows how to use an old cassette recorder to practice telegraphy. In position A of the...
We found this 4-channel mixer in the August 1999 issue of Electronics Now magazine. The circuit can...