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Re: How do I tell whether the phone's ringing?
- To: ukha_d@xxxxxxx
- Subject: Re: How do I tell whether the phone's ringing?
- From: "PatrickLidstone" <patrickl@xxxxxxx>
- Date: Wed, 05 Dec 2001 15:52:02 -0000
- Delivered-to: mailing list ukha_d@xxxxxxx
- Mailing-list: list ukha_d@xxxxxxx; contact
ukha_d-owner@xxxxxxx
- Reply-to: ukha_d@xxxxxxx
--- In ukha_d@y..., "Luc Degrande" <luc.degrande@s...>
wrote:
> There will be some components required: an external modem has a
> dedicated pin as "Ring Indicater". The level swings from
> -12VDC to +12VDC, I suppose this will need conversion to TTL level
> for connection to the input.
A diode should be enough for HV, it's inputs are buffered aren't
they, rather than TTL?
Patrick
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