Electronics > Beginners
Need help turning old payphone into dial-an-mp3 display
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ez24:

--- Quote ---If it's not funded at the highest level
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Maybe some ways to not open the phone.

Use LADAR and AI to externally determine what buttons are pressed.  Come up with a technology that allows you to transmit sound through the air but only be able to hear it at a predetermined spot (handset).

A less high level - use a cut-off wheel on a grinder and carefully open the back and rip out the guts.  No matter what you do, do not mar the outside.
skarecrow:

--- Quote from: Beamin on September 05, 2017, 08:38:00 pm ---
--- Quote from: skarecrow on September 03, 2017, 07:13:34 pm ---
--- Quote from: Towger on September 03, 2017, 06:06:39 pm ---There is no need to connect to a PABX.  The guts of the phone can be scrapped.  The pi has stereo audio out, just a matter of connecting it up to a cheap 8ohm speaker in the handset etc.

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--- Quote from: skarecrow on September 03, 2017, 07:13:34 pm ---
The guts CAN be scrapped,

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--- Quote from: skarecrow on September 03, 2017, 07:13:34 pm ---
That's the exact reason I recommended NOT scrapping the guts of the phone. The keypad only works because of the rest of the "guts" of the phone.

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So "CAN" they be scrapped or not? I'm trying to work out how to do this for another project similar to the OP but I don't understand how the circuit to the key pad can be optional i.e. they can be scrapped but at the same time they shouldn't be scrapped.

Also why would you put another speaker in the handset? I imagine it would be hard and take some modification to fit another speaker into that small shell and at least some soldering.




--- Quote from: skarecrow on September 03, 2017, 07:13:34 pm --- The software can turn the dtmf tones it receives through the pi's audio input and navigate the system, just as if you had dialed into a real pbx.


Are handset speakers 8ohm? For some reason I thought they were 32.

Sent from my XT1565 using Tapatalk

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I have a pi3b: Where can you connect audio in? I would like to use it as a sound card. They make USB soundcards? What would use such a thing so I know where to find one?  Also how do you match the impedance from the phones DTMF into the pi? Wouldn't it just overload without some sort of matching transformer? Do the USB sound cards have line level in or mic in? I have wanted to make a VLF radio from one and if its that simple it should be doable.

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Obviously the guts CAN be scrapped if you want to do things the hard way. The way I suggested only requires tapping into 4 wires inside the phone and supplying power.  The easy way requires you to leave pretty much everything exactly how it is with no mods at all.  Nobody suggested adding a speaker. The handset doesn't need to be opened (and probably CAN'T be opened without breaking) to access the wires as long as you can get into the phone. Just follow the handset cord until it gaes into the phone, then look inside where the cord went and there's your access to the speaker and microphone.

Yes, they make usb sound cards. You can get one with speaker out and microphone input for under $2usd on eBay. I have like a dozen of them laying around at home from back when I was messing around with different DJ software on a couple laptops.

On a side note, try not to quote bits and pieces out of context. That can really confuse people.

Sent from my XT1565 using Tapatalk


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Funvoyager:
I posted a reply that ended up in an earlier post.

Anyway, the idea of shipping projects out... I'm wondering, are there any Skype or netmeeting video clubs/discussions that anyone would want to do?  Since there are few people who do Egypt you all for it might be fun and prescribing schedule virtual build and problem solving sessions

John
Beamin:

--- Quote from: Funvoyager on September 06, 2017, 02:38:23 am ---I posted a reply that ended up in an earlier post.

Anyway, the idea of shipping projects out... I'm wondering, are there any Skype or netmeeting video clubs/discussions that anyone would want to do?  Since there are few people who do Egypt you all for it might be fun and prescribing schedule virtual build and problem solving sessions

John

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I think kick starter and go fund me want to see a return on investment. Maybe that's just kickstarter. Better to get a person going with a concreate plan and design before you start asking for money as you won't know how much to spend until you do. Maybe find a local electronics repair shop that has good google reviews. Many of those people like to tinker or try putting up ads at local community colleges. This is going to be a challenge. I know how much I would charge to build this and it wouldn't be cheap and take about a month to get the final product. I wish I still had my garage I would offer to work on some of it but some tools are going to be needed as little things always pop up like trying to get open the handset which maybe sealed..
ez24:

--- Quote from: Beamin on September 06, 2017, 04:25:38 am ---... the handset which maybe sealed..

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If you can hire 200 PhDs like Google (for health apps for their watch) , use the handset for health diagnostics.  Like BP.  If you go KS say it will detect cancer (there is a lot of BS there).  Use it to determine the health of your patients.  Seems like a good product for a doctors office.  Patients would have fun with it.
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