Dual Tone Multi Frequency Circuit Diagram
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Dual-tone multi-frequency signaling
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Frequency doubler / frequency multiplier circuit diagram
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S2559a/d/e/f general infrared remote control launch circuit (dual-tone
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![AUDIO_FREQUENCY_DOUBLER - Basic_Circuit - Circuit Diagram - SeekIC.com](https://i2.wp.com/www.seekic.com/uploadfile/ic-circuit/s200978234357608.gif)
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