This circuit was obtained from Linear Technology documentation from the 80's. Powered by 5 V it can be used as a shield. The components are from the era.
We found this circuit in an old Signetics documentation. The integrated circuit is of the time,...
This polarization step for electret microphones was found in an Electronics Now from the 90s. The...
This circuit in its original version was found in an 1975 English publication. It is a...