Found in a February 1949 Radio Electronics magazine, this dual tube mixer has 4 inputs. Power must come from a 250V source.
This circuit was originally designed for the practice of Morse code, something common in 1966, the year...
This is a circuit that appears several times in this section and in articles. It is a preamplifier for...
Using the 723 integrated circuit, this circuit was obtained from an article in the August 1971...