+Vorticon Posted February 24, 2023 Share Posted February 24, 2023 Hi. Does anyone have a manual for the original TI 300 baud modem by any chance? Lee kindly donated one to me a while back and I have a little project in mind for it. In particular, I need to know the power supply specs and the function of the 3-way TST switch in the back. 1 Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted February 24, 2023 Share Posted February 24, 2023 3 minutes ago, Vorticon said: Hi. Does anyone have a manual for the original TI 300 baud modem by any chance? Lee kindly donated one to me a while back and I have a little project in mind for it. In particular, I need to know the power supply specs and the function of the 3-way TST switch in the back. You mean the acoustic coupler? 1 Quote Link to comment Share on other sites More sharing options...
+Lee Stewart Posted February 24, 2023 Share Posted February 24, 2023 14 minutes ago, Vorticon said: Hi. Does anyone have a manual for the original TI 300 baud modem by any chance? Lee kindly donated one to me a while back and I have a little project in mind for it. In particular, I need to know the power supply specs and the function of the 3-way TST switch in the back. Acoustic Coupler Manual from WHTech. ...lee 2 1 Quote Link to comment Share on other sites More sharing options...
+Vorticon Posted February 24, 2023 Author Share Posted February 24, 2023 Thank you! Unfortunately the manual does not give the specs of the power supply other than stating it is a low power AC supply.... Any info on that? Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted February 24, 2023 Share Posted February 24, 2023 12 minutes ago, Vorticon said: Thank you! Unfortunately the manual does not give the specs of the power supply other than stating it is a low power AC supply.... Any info on that? I have two in my storage room. I am heading out there tonight or tomorrow and will have a peek for you. Maybe someone will come up with it before I do. OTTOMH, I believe it to be 9VAC. 2 1 Quote Link to comment Share on other sites More sharing options...
+Vorticon Posted February 24, 2023 Author Share Posted February 24, 2023 I tried a 9V AC supply and it powers up but fails the test procedure outlined in the manual. I think it's sadly broken... 2 Quote Link to comment Share on other sites More sharing options...
+Schmitzi Posted February 25, 2023 Share Posted February 25, 2023 Here is a picture of a psu with imprinted specs, but maybe this is not the original one from TI ? https://www.nightfallcrew.com/23/04/2018/telephone-coupler-modem-ti-php1600-boxed/ It says: "Novation Model 901017 - Input 117V AC 60 Hz 15W - Output 20V AC 400mA" hmm, but my list says: "120V 60Hz 12W - 24VA 9,6VA" That´s somehow strange now, but I have never checked that upstairs so for now, you have the choice 1 Quote Link to comment Share on other sites More sharing options...
Flottmann1 Posted February 25, 2023 Share Posted February 25, 2023 (edited) here PHP1600-Telephone Coupler.pdf Edited February 25, 2023 by Flottmann1 1 Quote Link to comment Share on other sites More sharing options...
+Vorticon Posted February 25, 2023 Author Share Posted February 25, 2023 Thank you! That second number stands for volt-amp. I need a 24V AC supply. That's what TI calls a low voltage PS? Sheesh... 1 Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted February 25, 2023 Share Posted February 25, 2023 10 minutes ago, Vorticon said: Thank you! That second number stands for volt-amp. I need a 24V AC supply. That's what TI calls a low voltage PS? Sheesh... Well, technically... 1 2 Quote Link to comment Share on other sites More sharing options...
Flottmann1 Posted February 25, 2023 Share Posted February 25, 2023 here a Pic from the other Side and my Manual PHP_1600.pdf 1 2 Quote Link to comment Share on other sites More sharing options...
+Vorticon Posted February 25, 2023 Author Share Posted February 25, 2023 One thing I noticed is that a null modem adapter is required to get any sign of life from the modem. Not something mentioned in the manual. Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted February 26, 2023 Share Posted February 26, 2023 1 hour ago, Vorticon said: One thing I noticed is that a null modem adapter is required to get any sign of life from the modem. Not something mentioned in the manual. From the TI? Seems odd to me. Quote Link to comment Share on other sites More sharing options...
+Schmitzi Posted February 26, 2023 Share Posted February 26, 2023 updated list: PSUs https://forums.atariage.com/applications/core/interface/file/attachment.php?id=1007383&key=13973505c10c2090fe8e8e1d6cbc1024 from that thread no warranties 2 Quote Link to comment Share on other sites More sharing options...
+Vorticon Posted February 26, 2023 Author Share Posted February 26, 2023 3 hours ago, Schmitzi said: updated list: PSUs https://forums.atariage.com/applications/core/interface/file/attachment.php?id=1007383&key=13973505c10c2090fe8e8e1d6cbc1024 177.13 kB · 12 downloads from that thread no warranties When I try to open the file it says content restricted... 1 Quote Link to comment Share on other sites More sharing options...
+Schmitzi Posted February 26, 2023 Share Posted February 26, 2023 7 hours ago, Vorticon said: When I try to open the file it says content restricted... hmm, sorry I don´t know... maybe an old Acrobat Reader ? anyone else with a problem ? Quote Link to comment Share on other sites More sharing options...
+Vorticon Posted February 26, 2023 Author Share Posted February 26, 2023 12 minutes ago, Schmitzi said: hmm, sorry I don´t know... maybe an old Acrobat Reader ? anyone else with a problem ? It looks like the problem is with my phone. No issues with my laptop. That spreadsheet is impressive! I know you keep a large database of everything TI, and I was wondering if you have it available for download by any chance. I would love to have it archived for my personal use. Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted February 26, 2023 Share Posted February 26, 2023 As for the power supply, since you are planning to do ungodly things to the device, maybe just open it up and figure out what voltages the circuits actually need and apply that directly. 24V AC seems like a lot to run a device like this, but then we are talking old technology. I imagine there is a transformer inside which is center-tapped, or the AC is used to derive positive and negative voltages (RS-232 being +/- 12V.) Quote Link to comment Share on other sites More sharing options...
+Vorticon Posted February 26, 2023 Author Share Posted February 26, 2023 46 minutes ago, OLD CS1 said: As for the power supply, since you are planning to do ungodly things to the device, maybe just open it up and figure out what voltages the circuits actually need and apply that directly. 24V AC seems like a lot to run a device like this, but then we are talking old technology. I imagine there is a transformer inside which is center-tapped, or the AC is used to derive positive and negative voltages (RS-232 being +/- 12V.) I tried to open it but I could not slide the PCB out. It's a weird case design where the short ends come off and everything inside is on rails. I think you are right about the 24V AC being split to +/-12V though. I did find a 19V AC supply in my junk box, and now I am getting more life out of the modem (it emits a continuous beep when on in Originate mode as expected), but still not working properly, so I think the 24V AC I ordered will do the trick fingers crossed. And no, I am no planning ungodly things to the device, but it's such obsolete technology that the mere fact of getting it to work might require Gregorian incantations and incense burning... 👿 1 Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted February 26, 2023 Share Posted February 26, 2023 6 minutes ago, Vorticon said: And no, I am no planning ungodly things to the device, but it's such obsolete technology that the mere fact of getting it to work might require Gregorian incantations and incense burning... 👿 Tonight, I will also sacrifice a bucket of KFC for the cause. 3 Quote Link to comment Share on other sites More sharing options...
+Vorticon Posted February 27, 2023 Author Share Posted February 27, 2023 1 hour ago, OLD CS1 said: Tonight, I will also sacrifice a bucket of KFC for the cause. That might totally do it. Too bad I'm not available to "help" with that sacrifice... 😁 2 Quote Link to comment Share on other sites More sharing options...
GDMike Posted February 27, 2023 Share Posted February 27, 2023 I think we should support his efforts by looking into a bucket of KFC for clues too. 3 Quote Link to comment Share on other sites More sharing options...
+Vorticon Posted February 28, 2023 Author Share Posted February 28, 2023 It works! The 24V AC power supply and the KFC sacrifice managed to attract the favors of the gods! Back on track The Gregorian chants and incense burning remain on hand just in case... My house sounds and smells like a bloody monastery from the dark ages... 2 1 4 Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted February 28, 2023 Share Posted February 28, 2023 1 hour ago, Vorticon said: The 24V AC power supply and the KFC sacrifice managed to attract the favors of the gods! Maybe the FLAVORS of the Gods? Mmmmmmm..... extra crispy..... 1 2 Quote Link to comment Share on other sites More sharing options...
GDMike Posted February 28, 2023 Share Posted February 28, 2023 15 hours ago, OLD CS1 said: Maybe the FLAVORS of the Gods? Mmmmmmm..... extra crispy..... You can get that in a deodorant spray 2 Quote Link to comment Share on other sites More sharing options...
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