This preamplifier circuit for turntable cartridges was found in the March 1994 issue of Electronics Now magazine. The circuit is suitable for magnetic cartridges.
This variable oscillator with crystal was found in a Popular Electronics of the 90s. The circuit uses...
This fuzz effect for guitars was found in an American 1980s documentation. The transistors may be the BC549...
The oscillator shown in the figure emits sound when or another input is taken to a high level and...