This circuit was found in old documentation, appearing elsewhere in this section, taken from other sources. The lamp is of a special type from the period.
This polarization step for electret microphones was found in an Electronics Now from the 90s. The...
This control for bass, midrange, and treble was found in the March 1995 issue of Electronics Now...
We found this circuit in a 1993 documentation. It is a high input resistance millivolimeter whose...