TomHoward Posted August 27, 2011 Share Posted August 27, 2011 Evening all I'm hoping to find a telephone handset style accessory for out intercom system. We have a lot of problems talking to backstage and FOH and (I'm rather ashamed to admit it, watching Traffic Cops and there telephone handset style interface on their car radio) it seemed that this would be an easier way - currently they have to put on a headset, press the Talk button & check the level - whilst this may seem easy to you or me it appears to baffle some people. What I'm hoping to find or build is a telephone handset, with the 'talk' button on the latch - so pick up the handset, mic opens and talk, put it down when you're done and it cuts the mic & speaker. Perhaps it could even have a call light on it. (I'm not sure whether a ringer is too far, and it could be side stage.) I've built adaptors (just using caps to isolate the DC) which has allowed us to get audio signals in and out of the comms ring, which has given us line level signal in and out of the comms ring, but I wouldn't trust it to drive a headset directly. Has anyone get any suggestions for this? I can't see one as part of the Tecpro accessories, the closest thing is the AD903 in/out unit which we could wire up to a handset via the latch, but at £195 it's not cheap. We're using ASL beltpacks which I believe are Tecpro compatible. Link to comment Share on other sites More sharing options...
J Pearce Posted August 27, 2011 Share Posted August 27, 2011 Canford do one thats pretty much as you describe. http://www.canford.co.uk/Browse/2001365 Linky to the handset I described. Link to comment Share on other sites More sharing options...
TomHoward Posted August 27, 2011 Author Share Posted August 27, 2011 Thanks - so they do! What an idiot I am - I'd been through the Tecpro section on the Canford site and the Tecpro catalogue and I couldn't find it in either. It's still a significant price though - but a lot of the intercom equipment seems to be to me. Link to comment Share on other sites More sharing options...
J Pearce Posted August 27, 2011 Share Posted August 27, 2011 I'm sure it can be had for less than canford's list price, which does seem extravagant... Link to comment Share on other sites More sharing options...
domroz Posted August 27, 2011 Share Posted August 27, 2011 Also see the ASL product IS 03 Intercom HandsetThe IS 03 Intercom Handset is provided with a ‘push-to-talk’ switch, spiral cable and XLR-4 connector. Link to comment Share on other sites More sharing options...
TomG Posted August 27, 2011 Share Posted August 27, 2011 Thanks - so they do! What an idiot I am - I'd been through the Tecpro section on the Canford site and the Tecpro catalogue and I couldn't find it in either. It's still a significant price though - but a lot of the intercom equipment seems to be to me. Looking at the site it gives you a lot of technical information in the selling blurb, which could allow someone with a decent electronics background to build something with a similar feature set at a much lower cost. For example they give the Frequencies of the call light and remote mic kill. Just a little suggestion. Some google'ing may be able to fill in some other technical details on how the system fully works eg, what each pin is used for. and any other tones or timings involved, if you were going to build a compatible device. Link to comment Share on other sites More sharing options...
pritch Posted August 28, 2011 Share Posted August 28, 2011 My understanding of the situation is that Canford's product is a beltback in itself (well, not beltpack, but you know what I mean) and so connects straight to the intercom line, whereas ASL's product just plugs in instead of the headset. I guess the question that will help you decide whether to go Canford or ASL is "Could I reuse that existing beltpack elsewhere?" Link to comment Share on other sites More sharing options...
TomHoward Posted August 28, 2011 Author Share Posted August 28, 2011 Yes - the ASL IS 03 appears to be a headset accessory, so would need a beltpack - we should certainly be able to make one of those easily enough. We're not exactly short of beltpacks but it would be good not to use them up if we can get away with it - plus there's no 'call' light available on the handset nor a speaker kill on the IS 03. The systems using three wires, a GND, +24v and an audio/DC line - the handset I guess would just need a couple of op amps to power the speaker from the audio line and to put the audio from the mic back onto it - the DC is used to drive the call lamp and there's a tone generator for a siren tone on call as well. The best bet might be to buy another beltpack (but they're still £170) and make a handset accessory to go with it, unless we can make the bits easily to interface directly with the intercom line. Link to comment Share on other sites More sharing options...
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