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index » General » General Discussion » Question about the "HF Telephone" schematic

data message 2007-12-30 03:16:15 orbiter Simple User Re HF Telephone schematic as indicated at the following link: http://www.technick.net/public/code/cp_dpage.php?aiocp_dp=cirtel_handsfree1 If only needing the mic amplifier portion of that circuit, how would it be connected to the phone? Any capacitor or resistor needed in between? My intention is to amplify an existing speaker phone's mic, to improve its sensitivity. Secondly, what sort of mic has a three wire connection (as shown in the schematic)?

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