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Old 13th Apr 2017, 5:42 pm   #1
ThePillenwerfer
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Default Homemade LD-DTMF Converter.

I came across details of this device which uses an ATTiny85 micro-controller some months ago but it was skimpily documented, and what there was was American, and gave no details of how to get the code onto a micro-controller.

I've finally managed it and it works very well. It does have limitations though.

Firstly it needs fitting inside the telephone, which involves some (reversible) mutilation and secondly the PCB is rather large. What it does have going for it is being dirty cheap.

I've only used it on my ATA as I'm far too upright a citizen to connect it to a PSTN line.

Details are here: http://joefreeman.weebly.com/uploads..._convertor.pdf
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Old 13th Apr 2017, 6:29 pm   #2
julie_m
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Default Re: Homemade LD-DTMF Converter.

Does your ATA not support LD, then?
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Old 13th Apr 2017, 6:35 pm   #3
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Default Re: Homemade LD-DTMF Converter.

No, it's a Linksys PAP2 which completely ignores pulses.
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Old 13th Apr 2017, 10:20 pm   #4
Dave Moll
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Default Re: Homemade LD-DTMF Converter.

The only ATA that I know supports LD pulses is the Grandstream HT502 - though I accept that there may be others.
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Old 13th Apr 2017, 11:00 pm   #5
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Default Re: Homemade LD-DTMF Converter.

I'm using a cheap Digium TDE-410P clone (electrically-identical hardware, runs same drivers) with two FXO (exchange line) and two FXS (telephone) modules. The latter accept pulse dialling (even during a call, e.g. to respond to voice prompts) and can ring a 1kΩ bell, so I can recommend this card as a good solution for vintage phone colections.

I wouldn't use a cheap clone card in a mission-critical application, but they are certainly fine for experimenting with.
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Old 16th Apr 2017, 9:09 am   #6
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Default Re: Homemade LD-DTMF Converter.

Look at this: http://www.classicrotaryphones.com/f...5644#msg185644

And this: http://bygselvhifi.dk/projects/telep...tmf-converter/


I use Dialgizmo on my PAP2 and it works well. http://www.dialgizmo.com/

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Old 15th Jun 2017, 1:29 am   #7
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Default Re: Homemade LD-DTMF Converter.

Hi Joe.
I usually lurk in a different part of the forum, and it was quite by chance that I saw this post, and I'm glad I did!

I first saw the Arnie and Boris articles about six months ago and thought it was a nice practical project that would get me started with Atmel chips.

It seemed straight forward enough, I won't bore you with with the details but let's just say I made little progress programming these glorified 555s, and eventually put it to one side and continued with my Raspberry Pi projects.

Then on Monday I saw your PDF, at last some clarity, *that's* where I have been going wrong, who knew, I was supposed to use Avrdude as well as the IDE?

Anyway, I have just finished the project and this 1980 onyx monstrosity can now dial out via my ATA and Asterisk (Raspberry Pi) PABX.

https://www.vintage-radio.net/forum/...pictureid=3830

https://www.vintage-radio.net/forum/...pictureid=3831

https://www.vintage-radio.net/forum/...pictureid=3829


Thanks Joe!

Graham.
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Old 15th Jun 2017, 10:47 am   #8
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Default Re: Homemade LD-DTMF Converter.

Glad it was useful to you.

Your onyx 'phone is certainly 'striking.'
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Old 15th Jun 2017, 2:33 pm   #9
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Default Re: Homemade LD-DTMF Converter.

Worse than that, I have another one, the same one as Delboy and Rodney had in their flat!

Todays project is the ATTiny85 fuse resetter so I can unbrick the victims of my failed efforts.

Joe, so that correct credit is given, was it you who added the *,#, and speed-dial functionality? The original article makes no mention of it.

Graham.
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Old 15th Jun 2017, 2:49 pm   #10
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Default Re: Homemade LD-DTMF Converter.

The *, # and speed dialling was already there. I only discovered it when looking at MAIN.C The comments in there give clues how to use of it. I made no changes at all to the code; I've no idea how and didn't have cause to find out.

As far the Trotter ivory candlestick, there's one on my sideboard.
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