Hmm. Good read. I'm starting to think this is a bad idea altogether. The
particular show has 6 phones on stage at once and all need to ring
independently of each other. I think the production staff was counting on
the ringing of the individual phones to help cue the (amateur) actors. I
think it would be much safer to play the ring from the sound booth and
make
the actors be big boys and learn their lines and cues w/o mechanical help.
:-)
Thx,
Tuner
"TimPerry" <timperry@[EMAIL PROTECTED]
> wrote in message
news:WLedna_xQ9dtmFnYnZ2dnUVZ_uOmnZ2d@[EMAIL PROTECTED]
> Tuner wrote:
>> I'm attempting to construct a control box into which 6 separate
>> phones will be connected with normal RJ11 jacks. I'd like to control
>> each phone's ringer separately - no voice line, just make the phone
>> ring.
>>
>> These will all be standard desk telephones, US issue. I understand
>> that I need approximately 90 volts AC to drive the ringers, but I
>> can't seem to find out the required amperage so I can purchase the
>> appropriate transformer. Is anyone familiar with the particulars?
>>
>> Yes, I've heard of the Tele-Q device, but we're working on no budget
>> and want to control 6 phones, not just one.
>>
>> TIA!!
>>
>> Tuner
>
> on old style phones on the bottom was printed a ringer equivalence
number.
> it usually was less then 1. for example .8 or .3
> when ordering phone lines for special purposes such as broadcast use the
> telco demanded equipment type number and ringer equivalence.
>
> the ring currrent would energize the solenoid which beat the clapper
> against
> the bells.
>
> you best bet is to measure the current draw of you phones when they
ring.
>
> please exercise caution as 90 vac can be lethal.
>
> today's phones which use electronic sound generators are a miniscule
load
> as
> compared to the old phones.
>
> more info on ringer equivalence is here
> http://www.answers.com/topic/ringer-equivalence-number
>
> an even more informative site:
> http://www.affordablephones.net/theringer.htm
>
> while i can think of several ways to produce 90 vac i can't think of any
> that are intrinsically safe. i might use an audio oscillator driving an
> audio power amp to provide power at 20 to 30 Hz.
>
> more probably i would fake the phone operation and play a sound effect
> over
> the PA system.
>
>
>
>
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