This is a multi-part message in MIME format. ------=_NextPart_000_0084_01C552A8.81514EE0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: 7bit > I would appreciate a schematic of the original This gif is the clearest way to do the schematic. I'll take a look at the rest of the article later today. The mod they made to use this with their SMS unit was to delete the two 1M resistors from pin 4, 15V zener, FET and fuse. The transient suppressor is optional "Alarm Out" is from pin 4 via a 100R resistor and is active high. I'll need to check the SMS unit article to find out how it accepts a 12V signal ------=_NextPart_000_0084_01C552A8.81514EE0 Content-Type: image/gif; name="sc-max8212.gif" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="sc-max8212.gif" R0lGODlhUgK0AYAAAAAAAP///ywAAAAAUgK0AQAC/oyPqcvtD6OctNqLs968+w+G4kiW5omm6sq2 7gvH8kzX9o3n+s73/g8MCofEovGITCqXzKbziQFIAQbqgTq1ZrXTQPYqBYcT3eoYik6r1+yetepF YK9yuj3+1jLycXj7DxgoOJjxdod3qFcHx2dIRsdHKDlJWal21sd4l1fWCFm22AdqSVpqerozZog1 6sjYeZjphziLanuLmzsyB6ngqhnqyMpLK6t7jJysvCpLnNgbnCkMbaxsfY1N+WWm6kvW/c35Czqa bX6Onp5UXrj168uuLj9PXxP/WBu1iOkdW/8PMCCJSHvw6TPIL181gQwbOowwraAcdxQrJhQWcaLF /o0cO3r8CDKkyJEkS5o8iTKlypUsW7p8CTOhl5gkDfbzR8HVOII4Id6LIjPEz4dERQztcBTCuAXv cgadkJFpz5yhmCpSSNWoiqZFu4Lg+gEsRKk3ySpFOlWMh20PKG4QewEuWq90B6aQ60DnxbwS8LZ9 usYv1K11Cwu921emXp1WF5pNJ7gvYcOUOUSOO1YhxnKMZ0qWd/ks4sqkD56QG3Qzv86Oy6IL3XZy 6dmDUfhd6lpz2qqvd8mmDZyv7czVcNv0A5j3klWrv/oeHTz64xKoFU/HGgb1kzMEnb19Ply6eOXg 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