Selling sound powered phones and parts as a lot.
20 phones
15 elements
5 switches
4 cords
Most parts are used, some are new. Cords have various plug ends. Not sure of status of phones. Selling because I went with a different system. $1000.00 for the lot.
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Sound Powered phones
Started by Shawn72, Feb 11 2015 08:51 AM
21 replies to this topic
#2
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Posted 11 February 2015 - 05:38 PM
Shawn72, on 11 February 2015 - 08:51 AM, said:
Selling sound powered phones and parts as a lot.
20 phones
15 elements
5 switches
4 cords
Most parts are used, some are new. Cords have various plug ends. Not sure of status of phones. Selling because I went with a different system. $1000.00 for the lot.
20 phones
15 elements
5 switches
4 cords
Most parts are used, some are new. Cords have various plug ends. Not sure of status of phones. Selling because I went with a different system. $1000.00 for the lot.
Which system did you go for?
There are three roads to ruin; women, gambling and technicians. The most pleasant is with women, the quickest is with gambling, but the surest is with technicians. Georges Pompidou
#4
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Posted 13 February 2015 - 08:27 AM
Shawn72, on 12 February 2015 - 04:29 AM, said:
Just some regular phones with a 12Vdc power supply in line. Picked the power up off of 1 of my 24Vdc batteries. Clear and reliable.
Yup - the only down-side is that they must all be in series.
There are three roads to ruin; women, gambling and technicians. The most pleasant is with women, the quickest is with gambling, but the surest is with technicians. Georges Pompidou
#5
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Posted 14 February 2015 - 05:33 PM
Emax, on 13 February 2015 - 08:27 AM, said:
Yup - the only down-side is that they must all be in series.
Not exactly. One phone at top and three at bottom. As long as top is off the hook, all work. Power source in line to top.
#6
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Posted 15 February 2015 - 01:13 PM
Shawn72, on 14 February 2015 - 05:33 PM, said:
Not exactly. One phone at top and three at bottom. As long as top is off the hook, all work. Power source in line to top.
What about a mid-station? It may want to call either direction.
There are three roads to ruin; women, gambling and technicians. The most pleasant is with women, the quickest is with gambling, but the surest is with technicians. Georges Pompidou
#8
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Posted 17 February 2015 - 06:13 PM
Shawn72, on 17 February 2015 - 04:44 PM, said:
no mid station
OK - that works. But for an equipment vendor, it presents a problem. Normally open hook switches and shorting jacks are possible solutions - but still there is the series thingy. Maybe it's OK.
There are three roads to ruin; women, gambling and technicians. The most pleasant is with women, the quickest is with gambling, but the surest is with technicians. Georges Pompidou
#9
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Posted 05 April 2015 - 08:42 AM
We use standard 2554 wall phones with amplified handset which makes it great for noisy places like motor houses or under the drive terminals. To provide the "talk battery" we have built a small box to house the terminal strip, LED indicator, a fuse holder, and a small voice transformer. The transformer is a 600 ohm to 600 ohm transformer with the one 600 ohm winding split, NOT center tapped. You place a 1uf capacitor across the split of the winding and feed your 24 volts filtered DC across the split as well. 12 volts DC will work but it seems that the 24 volts is better. "Tip" and "Ring" for the telephones comes from the main leads of that winding on the transformer. The capacitor maintains the 600 ohm impedance for the audio and the split coil provides the loop current needed for the talk circuit. The non split winding, or secondary winding, is not used. It is simple and straight forward and the phones get hooked up to the circuit just as if it was a standard phone line. No need to worry about series circuits or any other special switches or such.
Steve
Steve
#11
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Posted 22 October 2015 - 12:51 PM
TCOTTAM, on 26 August 2015 - 05:47 AM, said:
INTERESTED IN BUYING THE SOUND POWERED PHONES DO YOU HAVE A PHONE NUMBER I CAN CONTACT YOU AT. PLEASE EMAIL ME AT TCOTTAM@ANGELFIRERESORT.COM
I tried to email you and it bounced back. My email is "kplifts@purityspring.com".
#14
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Posted 26 October 2015 - 08:29 AM
timberlaker, on 23 October 2015 - 06:23 PM, said:
The ansi code states reliable communication. What if you loose your 24v supply. It is a plausible scenario.
First, ANSI is not a "code" - it is a standard.
Second, based on experience, sound-powered phones are not very reliable ... subject to a multitude of failures.
Standard analog telephones are much more reliable - even if powered by system voltage.
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There are three roads to ruin; women, gambling and technicians. The most pleasant is with women, the quickest is with gambling, but the surest is with technicians. Georges Pompidou
#15
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Posted 26 October 2015 - 07:38 PM
In a day with radios and cell phones I would argue that a 24 V system is plenty reliable and if you don't have control voltage you've got larger problems than communication...
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Posted 31 October 2015 - 03:45 PM
Code: a set of rules and standards adhered to by a society. We are forced to adhere to said Standard are we not? Semantics some may say. It is Halloween why not split some hairs. Either way this is the classic Po-Ta-Toe vs PO -tay-toe issue. If cared for Sound powered phones are reliable. I have had both but have always inherited the Viking type not the aforementioned method so in all fairness I should give the aforementioned method a try.
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#19
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Posted 13 December 2015 - 09:11 AM
Why the sound pressure from hour voice causes a diaphragm to move a conductor through a magnetic field and creates current. That current then travels to the other end of the lift where the reciprocal happens. Except your ear is on the diaphragm at the other end.
Would you be kind enough to post a link to the supplier of your 6v phones?
Would you be kind enough to post a link to the supplier of your 6v phones?
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