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We found this circuit in the November 1992 issue of Radio Electronics magazine. The 30V power supply must be symmetrical and preamplification stages are included.
This audio stage can be used in siren circuits, sound effects and others to excite a few watts...
In the figure we have the way to make the connection of voltage regulators in series to obtain a...
This circuit was found in a 1967 US documentation. The FET is general purpose and the 6V zener....