Using the NE5205 integrated circuit this circuit was found in the May 1987 issue of Radio Electronics magazine. It can amplify signals up to 450MHz.
B In this circuit we show how to use an electret microphone powered by a small battery (can be of...
This circuit is from a 1976l filter cookbook. The circuit has a factor Q = 3, and must be supplied...
Using transistors at the time, this circuit was found in a 1970s documentation. Transistors support...