Pete Zenners  #200 Acoustic Stetho Amplifier Circuit

High-Gain Contact Audio Amplifier Circuit #200
Acoustic Stetho - Using A Single LM389 Chip

High-Gain Contact Audio Amplifier Circuit Packaged

Engineered by Pete Zenner, KE0BRS - Sioux Falls, South Dakota

#200 High-Gain Contact Audio Amplifier Circut Downview
 

The #200 Acoustic Stetho is a high gain amplifier using a single LM389 IC Chip which is specifically designed to convert physical vibrations into sound. The low distortion audio is excellent when officers need information on barricaded suspects or covert surveillance. The circuitry is based on the industry standard A15 designed by John S. Wilson, Jr.

Modifications include a single integrated circuit replacing discrete components, for increased ruggedness and easier maintenance. A mono 1/8" input jack allows the technician to use commerical off - the - shelf contact microphones (also called accelerometers) or called Piezos for non-invasive listening through solid walls or window panes, or self-made "spike mics" to penetrate through a pre -drilled hole on one side of sheet rock hollow walls. Use over - the - ear sealed headphones for best results.

This item should be in every technical investigator or surveillance officer's kit bag.

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High-Gain Contact Audio Amplifier Circuit Artwork
High-Gain Contact Audio Amplifier Circuit By Pete Zenner
#200 High-Gain Contact Audio Amplifier Circuit Screen

     #200 ( Fully Assembled ) Photos

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#200 High-Gain Contact Audio Amplifier Circut LM389 IC Chip
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