Controlling old phones: tinkering video

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Today I'm tinkering and experimenting with an interesting telephone interface module I found on Aliexpress.
My ultimate goal with this thing is to make an on-stage telephone ringer for theatre use, and (spoiler) it seems like it will be a really good way to do it.
I mentioned that Gadget Reboot is also experimenting with this module. Check out his experiment: • KS0835F Telephone Subs...
He's also doing a bunch of other phone tinkering on his second channel: / @gadgetsideload
Here's the datasheet for this and a similar module if you are interested:
download.generalelec.com/Datas...
www.silvertel.com/images/data...
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This isn't the only way to do it.
It's probably not the best way to do it.
But it's how I did it.

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Опубликовано:

17 ноя 2022

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Комментарии : 53

@retrozmachine1189 Год назад

In the late '90s I was receiving introductory training on Ericsson MD110 systems. Part of this was to go onsite with a new large system and assist with installation. This particular MD had an external voicemail system linked to the MD with RS232 for control. During lunch break I snooped on the serial comms to see what was going on and noticed it was all plain text and saw that it was very easy to prompt the MD to do a short ring on a handset to indicate messages were waiting. A short program on the laptop and some ringer tone adjustments later and I had the phones in an office crudely playing those well known notes from Blue Danube waltz much to the amusement and bewilderment of the people training me when they came back from lunch.

@jerril42 Год назад

I got a serious sense of nostalgia hearing those phone sounds. All that was missing are the dial-tone and busy signals and Lilly Tomlin playing the operator. Thanks Mr. Stuff. Stay warm.

@jyvben1520 Год назад

she only works from 9 till 5 ...

@jayherde0 Год назад

Reminded me of something that came up a very long time ago. We needed to have a bell ringing alarm clock for a piece of concert music. I forget what we ended up using. It doesn't look like much of a problem these days.

@spacewolfjr Год назад

Very cool, I have an old multi-line phone I've been wanting to use this is perfect.

@unlokia Год назад

I used to make phone taps, fm telephone bugs and beige boxes (before the internet and it’s “let me show you how to X” mindset - it’s all incredibly simple and is logical progression when you have to work things out; that’s what develops one’s mind!) back in the 90s. Also I looked into “infinity transmitters”. A chap here in England used to make an INCREDIBLY impressive range of these - minuscule black blocks which had all the clever stuff potted inside, brought out onto 2 turned gold pin sockets which were sitting flush with the surface of the carefully sanded flat black potting compound. The construction alone was a work of art. I wish I could remember his name. I’d call him at home (we never met) and he’d tell me the DTMF code he’d set into the demo unit; he’d tell me he was going to hang up and that I should wait X seconds and then enter the code, which I did, and I’d then hear VERY amplified room audio from his end. Google _”Infinity transmitter”_ - but I’d caution against using one!!

@AERVBlog Год назад

Thanks for this. I work on Telos 1X6 telephone interfaces for radio stations and I have always had the problem of hooking them to a phone line for testing. Most of us don't have those anymore. I can make it work through my Magic Jack but that is a pain. This little board looks like it can act like a Ma Bell and solve my problem.

@onecircuit-as Год назад

Great module, excellent vid and some sounds from the past! 👍😀

@TheEmbeddedHobbyist Год назад

The mic audio fed back is normally referred to as "side tone", used a lot when the user is wearing headphones with a boom mic. The headset blocks the external sound path from the mouth to ear so the side tone just puts it back. It can be used to help make the user talk louder; if you reduce the level fed back it can cause the user to speak louder to increase the volume in their ears. We are used to hearing our own voice at a certain volume so will increase or decrease to maintain the level we are used to. Fun communications fact. 🙂

@fredflintstone1 Год назад

Woof!! I missed the fun part

@pileofstuff Год назад

Yup. I couldn't think of the right name on the fly while recording.

@TheEmbeddedHobbyist Год назад

@@pileofstuff spent way too many years in audio coms to forget what it's called.

@tomhouston9021 Год назад

I got a serious sense of nostalgia hearing about T1 circuits. For those hard-to-reach wire-wraps I found that a metal-barrelled propelling pencil with the lead taken out works nicely.

@alanmon2690 Год назад

Wiring tool - -brought back memories. I still have mine, 6 tools, 3 SWG and 3 metric, plus two removal tools -one for StepxStep (Strowger) and one for TXE4 and Cross-bar. Happy days those days in the 70s.... plus the 50v lead acid glass-tank batteries in the basement, slowly emitting acid vapours as they recharged

@pileofstuff Год назад

I had the "pleasure" of dealing with wet cells for the first couple of years of my career, then they all got replaced with VRLA cells. Didn't need the rubber space suit any more!

@jstro-hobbytech Год назад

Awesome video brother

@thisoldjeepcj5 Год назад

That was fun. Thanks.

@paulcabrelli1863 Год назад

Cool project Mr.Stuff :)

@spacewolfjr Год назад

Are you watching the Grey Cup Mr. Stuff?

@CezarySiw Год назад

It is called SLIC module (Subscriber Line Interface Circuit). Many years ago I used to replace those in PBXes (usually failing after lightning hitting nearby)

@SeanBZA Год назад

Yes did get to swap them off the line cards to get working lines on the PBX, then call to get replacement ones, along with new caller ID modules that plugged into the top. Had the tech come out one day to "borrow" 2 cards that were not all used, just port swap the 2 extensions per card to another unused set of ports on a 16 port card, so he could get an exchange going again that had been clobbered by lightning.

@frankowalker4662 Год назад

That is such a neat module. You could make an intercom system with it. :)

@pileofstuff Год назад

Yeah, that would be pretty easy. Just need one of these per phone and a bit of glue logic to tie the signals together.

@frankowalker4662 Год назад

@@pileofstuff And a hell of a lot of wire. Ha ha. You could set it up so that when you picked up your reciever, the other phone rang. (and vice-versa)

@arrow201 Год назад

I've played with those Ag1171s ... they're very cool. You wired it up the hard way, you can use, ie, 2 x 14 ic sockets to help plug the Ag1171 into a breadboard. :)

@pileofstuff Год назад

Doh! Didn't think about those.

@DFaulkner0 Год назад

Neat!

@unlokia Год назад

Nutshell: it’s a POTS line interface on a module. Generates line voltage (-48VDC), ringing voltage etc. Author seemed to take the long way round in the video 🙂😁. I did kiiiinda think _”why on earth is he building a 20hz oscillator; did he think they’d go to the trouble of designing an entire POTS interface, and then forget to add ringing generation? 🤨”_ Lol. To err is human I suppose.

@edgeeffect Год назад

I ripped the guts out of my phone and started again... more difficult 'cus there's more to do, but it does mean I can manage to ring my bells with just 20 volts instead of needing the full 40. I've wired my bells up to a microcontroller and each one's on it's own 20V circuit instead of being on the two poles of a 40V circuit.

@rjpete66 Год назад

Nice! There is actually a unit floating around in Winnipeg these days. I built one (not with these modules) for a tv show a couple years ago. I assume the prop master still has it. I used an arduino to switch a mosfet and drive a 12v transformer in reverse to create the ringing voltages. I even set up the intercom function but that had to be switched in manually from the ringing circuit as I didn't have time to figure out how to get the arduino to do it automatically. When I saw you get these ones I went and ordered a couple from aliexpress myself. Note that another option may be some of the voip interfaces to create a small pbx. I picked up one that has two phone lines but I still haven't gotten around to trying it out.

@pileofstuff Год назад

I remember decades ago fixing a portable ring generator for another props master. It was a transistor oscillator, a couple stages of transistor amplifiers (basically an audio amp) and an output transformer. All in a box that looked like it was from the '60s.

@rjpete66 Год назад

@@pileofstuff That could have been before my time (or at least around the time I first started - about 20 years ago). I wouldn't have known enough to touch something like that back then. It doesn't come up too often in film and tv these days as it is more controllable in post so it doesn't step on anybodys lines. This one show had one they'd ordered get lost or stuck in shipping and asked me on a friday if I could build one to be used monday and I realized I had learned enough to be able to pull it off.

@rjpete66 Год назад

@@pileofstuff and the need for ringers is pretty rare due to lack of land lines in shows and life these days 🙂

@spacewolfjr Год назад

@@pileofstuff in the mid 2000s I was asked to _gently hose out_ a ring generator as Burton Cummings had vomited inside of it. I still can't eat Salisbury steak to this day.

@pileofstuff Год назад

@@spacewolfjr That reminds me of the condition of the snake after a gig I did back at the old Monty's bar many, many years ago. 🤮 I still have nightmares.

@GadgetReboot Год назад

Great project! I'd never have thought of also providing the audio path in a stage prop setting. I tried getting my module to self-ring by setting the ring mode or fwd/Rev high/low in all combinations, including keeping the other floating while the other is high or low, and I can't get mine to ring on its own....weird!

@rjpete66 Год назад

Do you know if you have the same modules? After I saw both your guys videos I went looking on aliexpress and found a bunch of different versions/part number combinations and it was hard to tell how compatible they were. I haven't had time to try mine yet so don't know if mine will self ring either.

@GadgetReboot Год назад

@@rjpete66 I'll have to check what Aliexpress has again and see if they have datasheets that explain differences, maybe I'll want to try a different one for fun. At least with a microcontroller it should still work whether we need to toggle the ring pin or not.

@rjpete66 Год назад

@@GadgetReboot the vendor i bought from didn't have a datasheet but i googled the part number and found one someplace else. Mine have part number KS0835F V1.4 but i also saw similar part numbers and some just said AG1171 so I'd be curious how consistent they are from vendor to vendor or even from the same vendor over time.

@rjpete66 Год назад

@@GadgetReboot might also be fun with a microcontroller to play with the ring cadence a bit. Might make an interesting halloween prop if it had wonky changing ring cadence and a spooky voice recording on the line when someone picks up.

@fumthings Год назад

hi, um, i have become obsessed with your approximately display, and i have a question. does it ever update during the recording of a video? thank you.

@pileofstuff Год назад

RU-vid only provides a rounded off number (hence approximately), so it might roll over to the next hundred, but I don't think it's happened while the camera is on.

@qwaqwa1960 Год назад

T1 still exists?!!?!?!??? No way.

@pileofstuff Год назад

Oh yeah. We still have a bunch of them for interswitch voice and things like that - especially on the legacy switching platforms. Though most of them are multiplexed into bigger bandwidth pipes these days.

@adam850 Год назад

Can you still use the 555 to time the overall ringing? The 2 seconds on, four seconds off ring cadence?

@pileofstuff Год назад

Probably. That's a good thought.

@GadgetReboot Год назад

@@pileofstuff shudda used two 555's

@happysprollie Год назад

Just out of interest, on your socket, the green wire goes to the terminal marked 'R' and the red wire to the one marked 'G'. Does it matter?

@pileofstuff Год назад

Not in any practical sense. It's mostly just convention. The old analog phone system was designed to be quite tolerant of whatever might happen outside of the central office.