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#629102 - 04/14/19 09:55 PM Re: Chaining 66 blocks with AMP connectors [Re: Greg Ercolano]  
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@Prof Shadow:
Don't worry: those little yellow/orange rectangles are mechanical relays, so there is some clicky-clicky action during use: one clicks once per ring, the other clicks going into/out of hold.

@ChrisRR:
Sounds great -- have fun at the show with the board!
My advice: just keep any metal from falling on it or possibly getting under it, or it'll be a short demo, lol.

If you decide to mount it to a board (feel free to), either use standoffs or use a trick I sometimes use when I don't have those handy; cut the rubber insulation off a round 3 conductor power cord/extension cord, trim into 1/2" little cylinders of rubber, and use those as standoffs.. works great. Compresses a little when you tighten the screws down, but stiffens up into a sturdy structure.

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#629103 - 04/15/19 12:57 AM Re: Chaining 66 blocks with AMP connectors [Re: Greg Ercolano]  
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I wish I knew somebody with a 3D printer, I'd have them make a nice case for it.

#629114 - 04/15/19 07:59 PM Re: Chaining 66 blocks with AMP connectors [Re: Greg Ercolano]  
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I'd thought about this too, though I'd thought about finding a metal chassis about the right size.

I'll bet there's some pre-made presentation cases that would work fine for this if you wanted to get fancy.

I once had an old backgammon case that looked something like this:
[Linked Image]
..and that did come to mind laugh

#629121 - 04/15/19 09:57 PM Re: Chaining 66 blocks with AMP connectors [Re: Greg Ercolano]  
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Hmm, I haven't actually tried this, but since the board is 12VDC, you could probably power your demo with a single 12V lantern battery (or two 6v lantern batts in series). That'd get you lamps, buzzers, intercom.. might even handle powering the 12V ring generator (a PowerDsine) as well for bells and everything. A portable PBX, lol.

Or maybe you can re-purpose some of those 12V rechargeable lithium batts many screw guns use, which probably have more amp hours, and is easy to recharge. I actually have a 12V screw gun with a pair of batts.. I guess I should try a test to see how long I can run a couple of phones this way.. will follow up if I can.

#629124 - 04/15/19 11:08 PM Re: Chaining 66 blocks with AMP connectors [Re: Greg Ercolano]  
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ChrisRR: OK, that screwgun 12v battery test with the board worked out pretty well, actually.
Shot a couple of quick videos below showing the test results.

Turns out the one Ryobi battery can manage all 4 phones for bells, buzzers, intercom, the works, with no wall AC needed. The little PowerDsine ring gen rang all 4 phone's bells pretty well, even though I think it's a 3 REN device (?).

Video #1: 4 x 1a2 phones + KSU powered by a Ryobi screwgun's 12V batt battery.

Video #2: Volt meter showing the battery's output voltage running 4 x 1a2 phones

Some extra details:

  • The battery's output voltage did sag a few 10ths of a volt at the end of each bells/buzz/intercom test, so I'm not sure how long one can sustain this type of use on a single battery charge before the lamps get dim and the DTMF dialing and CPU power stops working. For instance, in the 2nd video, the meter starts out showing 11.76v when the KSU is idle, and after a run of tests and return to idle, the batt is down to 11.72v.
  • The single batt used in this video had already run several tests before I made the video, and it started with a full charge showing about 11.82 or so.
  • The two batts for my Ryobi are about 3 years old, and gets a lot of use, so they're by no means new batts. But I do always keep the spare on the charger.



Last edited by Greg Ercolano; 04/15/19 11:10 PM. Reason: Video #2's url description was being truncated
#629159 - 04/17/19 01:43 AM Re: Chaining 66 blocks with AMP connectors [Re: Greg Ercolano]  
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I ran a 551C with one of those 12v to 120V inverters, once. I had one of those cell phone to pots adapters for a CO line. A truly mobile 1A2 setup.

The fact that your board runs natively on 12 volts makes all kinds of things possible. I know one of the TCI guys had a 1A2 system set up in his motorhome.
It would make it really easy to have it battery backed so it would still work in power outages.

HMMMM.....
The mind wanders...

#629180 - 04/17/19 05:31 PM Re: Chaining 66 blocks with AMP connectors [Re: ChrisRR]  
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I figure a $120 APC or Tripp-Lite battery backup UPS (Uninterruptible Power Supply) could keep a 551x working through a power cut, though not sure how well the UPS would like the large surge from initial power up/down of the large linear power supply transformer in the 551. I use a UPS to protect my business phone system and A/V equipment from random power cuts.

For some reason the local power substation likes to explode from time to time, once it sent a surge so large it blew up 3 devices; my business phone system's power supply (an AT&T 1080), a DVD player, and something else I can't remember. I opened the DVD player and found the power protection varistor had blown completely, and left a large black spot on the board and on the metal chassis. Replaced the varistor to fix the player, and had to replace the phone system wall wart.

BTW, I did locate my old backgammon case which I'd used for various industrial purposes over the years. The board fits inside perfectly.. here's an actual pic (instead of the obvious photoshop mockup I'd posted earlier in this thread):

[Linked Image]

I guess I could mount it to a board that fits inside, so I don't have to drill through the case.

#629251 - 04/19/19 04:50 AM Re: Chaining 66 blocks with AMP connectors [Re: Greg Ercolano]  
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I like that. That's snazzy!

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