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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.
Found in an old Popular Electronics this circuit is still current. The SCR can be of the 106...
In the figure we have an amplifier using the 741 operational amplifier without the need for a...
Found on an 80's Radio Electronics, this circuit is designed to pass the 300 to 34,000 Hz voice...