This circuit appeared in Radio Elecronics magazine in 1968. The operating circuit is a general-purpose type at the time and the power supply must be symmetrical.
This variable high pass filter covers the range from 23 Hz to 700 Hz with the components used. The...
This flashlight project with a blinking light that makes it easy to find was found in the January...
This circuit was found in old General Electric documentation. The circuit makes use of a...