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A schematic of the HM9102C/D circuit. There's the tip and ring of the phone line coming in from the top-left, the HM9102D in the bottom middle, and the keypad on the left.

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A schematic of the HM9102C/D circuit. There's the tip and ring of the phone line coming in from the top-left, the HM9102D in the bottom middle, and the keypad on the left.
https://digipres.club/system/media_attachments/files/113/675/254/635/874/496/original/0e9dacedb9997f71.png

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Foone🏳️‍⚧️ (foone@digipres.club)'s status on Thursday, 19-Dec-2024 03:33:03 JST Foone🏳️‍⚧️
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Here's the translated(ish) schematic from the HM9102D datasheet.

In conversation about a month ago from digipres.club permalink