Selti 1+n

[elkesan]

Dear Friends,

first: I cannot speak Italy .

Domanda corta con l'Italia, via Babelfish. È uso possibile Acet 22205/22220 come pezzo di ricambio per Selti? È il segnale di chiamata positive o negazione? Acet usa il segnale di chiamata negativo. Come circa Selti? Come pulsante per gli impianti aperti del portello? È cortocircuito di 50-Ohm in linea?

I want know technology of the Selti 1+n. Amplifier is SL/C411, phones are

SL/C201-22, SL/C201-23, SL/C202-22, SL/C202-23. Here in Finland Selti is gone, we have'nt spare parts. So, I cannot test.

Question is: what is technology base of it? Is it same as in Acet?

Acet:

Speech: Common wire is "-" and audio is "+". (Acet amplifier common is "2" and speech is "7".)

Call: Common wire is "+" and audio is "-". Call signal is AC, but negative voltage. Call signal is "electronic" or "buzzer".

Door open: Short circuit.

So, Acet use positive system in speech-state and negative system in call. Terraneo (Bticino, LT) use this same technology; polarity is reversed. It is possible use Acet phones as spare part for Terraneo- Maybe. Maybe it is possible use Acet phones as spare part Selti...

So, how this technology is in Selti? I have simple system schema, but polarities is not possible know from it.

- Speech circuit is same as in Acet.

- Call circuit I don't know. Anybody know is it negative or positive call signal?

- How door open works? It is not pure short circuit, loudspeaker is "serie resistor". Do anybody know this circuit? Is it possible use short circuit for door open?

So, question is: "Is it possible use Acet 22205 and Acet 22220 as spare part Selti?". Is call signal negative or positive? Switch in phone, it is "50 ohm loudspeaker on line"?

Domanda corta con l'Italia, via Babelfish. È uso possibile Acet 22205/22220 come pezzo di ricambio per Selti? È il segnale di chiamata positive o negazione? Acet usa il segnale di chiamata negativo. Come circa Selti? Come pulsante per gli impianti aperti del portello? È cortocircuito di 50-Ohm in linea?

Jukka Kähkönen, www.****.fi

Modificato: 18 gennaio 2008 da Luca Bettinelli