Found in an old Elektor, this circuit uses two 7-segment displays to indicate the volume of an amplifier. The circuit uses components that are still common today.
We found this circuit in a 1978 publication. It provides a different combination for alarm sensors...
This preamplifier for magnetic cartridges was found in the February 1990 issue of Radio...
This circuit has its frequency controlled by a 1MHz crystal. The circuit can be powered by...