The integrated circuit used in this amplifier is not very common today. This amplifier was found in the 1977 National Semiconductor Audio Handbook. The power source must be at least 500 mA.
This oscillator for the fifth overtone of a crystal was found in a Radio Electronics magazine from...
Found in an American publication from the 1970s, this circuit makes use of unusual components...
This circuit was found in the September 1984 issue of Radio Electronics magazine. The frequency is given...