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Mod-286 build thread
Mod-286 build thread
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Old 11th July 2018, 06:12 PM   #151
tomchr is offline tomchr  Canada
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Duly noted.

The Guardian-686 and a Modulus-686 amp kit project are ahead of the MOD286.
The Guardian-686 should enter production this week and its documentation will come together pretty quickly. I'm planning to have the amp kit ready by early August as I have a buyer for the assembled amp. I'm aiming to design the chassis to be able to accommodate both the MOD686 and the MOD286 - or at least such that I can easily reuse the CAD files. I'm thinking a Modushop 3U Dissipante for the MOD686. For the '286, a 2U is enough.
In summary: The MOD286 Rev. 2.0 will likely happen in early/mid fall. October would be nice as that would allow that project to gain a little exposure before the Christmas rush.

I also need to remember to take a day off here and there to clear my head.

Tom
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Modulus-86, 186, 286, 286 Kit, & 686: 40-240W (8Ω) at <-120dB THD. HP-1: 3W/20Ω, -130dB THD, 128dB DNR.
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Old 11th July 2018, 06:46 PM   #152
zman01 is online now zman01  Bangladesh
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Mod-286 build thread
Quote:
Originally Posted by tomchr View Post
I also need to remember to take a day off here and there to clear my head.

Tom
Should we remind you?

Jokes aside, good to see the pipeline of products in the making!
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Old 11th July 2018, 06:52 PM   #153
tomchr is offline tomchr  Canada
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Quote:
Originally Posted by zman01 View Post
Should we remind you?
That would probably be helpful, actually...

Tom
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Modulus-86, 186, 286, 286 Kit, & 686: 40-240W (8Ω) at <-120dB THD. HP-1: 3W/20Ω, -130dB THD, 128dB DNR.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 11th July 2018, 07:09 PM   #154
OlegSh is offline OlegSh
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Mod-286 build thread
Hi Tom,

I am also interested in Mod-286. I plan to make my Zaph's ZDT3.5 active and need 4 Ohm capable amp. Mod-686 would be ideal but the board size is a bit too long to fit across the speaker cabinet, thus Mod-286. I would also be happy if you will offer input sensing auto on/off board at some moment. It seems practical for active speakers.

Regards,
Oleg
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Old 11th July 2018, 07:24 PM   #155
tomchr is offline tomchr  Canada
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No promises on the timeline for this, but I did include a control port on my Intelligent Soft Start (ISS) board with the intent of using it with an input-sensing on/off board.

The MOD286 comes first, though.

Tom
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Modulus-86, 186, 286, 286 Kit, & 686: 40-240W (8Ω) at <-120dB THD. HP-1: 3W/20Ω, -130dB THD, 128dB DNR.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 12th July 2018, 03:20 AM   #156
chrisb is offline chrisb
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If you think you might need a field beta tester for any of these new designs, I might know a guy whose spare time will soon need to be redeployed from woodworking in commercial shop to small home workbench.
Don’t ask why, but I suspect his wife would be grateful
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Old 12th July 2018, 01:20 PM   #157
TioFrancotirador is offline TioFrancotirador  Poland
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Tom,

The obvious advantage of MOD686 over future MOD286 2.0 is more power.
Are there any other ones that you expect? Especially ones that impacts SQ?

Last edited by TioFrancotirador; 12th July 2018 at 01:29 PM.
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Old 12th July 2018, 06:11 PM   #158
tomchr is offline tomchr  Canada
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I expect the MOD286 2.0 to provide about 55 W into 8 Ω and 110 W into 4 Ω on a ±35-36 V supply. If you want more power than that, the MOD686 is where it's at.
I expect all other parameters and the sound quality of the MOD286 2.0 to be similar to those of the MOD686.

The whole point of the Modulus series is that the amplifier does not make sound. It's just there to provide power.

Tom
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Modulus-86, 186, 286, 286 Kit, & 686: 40-240W (8Ω) at <-120dB THD. HP-1: 3W/20Ω, -130dB THD, 128dB DNR.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 22nd July 2018, 10:56 PM   #159
poseidonsvoice is offline poseidonsvoice  United States
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Mod-286 build thread
Thumbs up Poseidon's Voice Modulus 286^2 build

Hi again!

I'm sure a few of you are procrastinating as I had with completing a Modulus 286 build. Well, perhaps this post will serve as an impetus for you folk that need that encouraging boost

Pretty self explanatory (you can click on each of the photos to enlarge them):

Click the image to open in full size.

Over 170 SMD parts/board - loved the experience!

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

A lot going on here. 300VA transformer with electrostatic shielding and a steel enclosure. AMB Epsilon 24 board for momentary switches w/relay. 2 PS boards, a total of 88,000 uf of capacitance. 4 channel Modulus 286 build, hence the name Modulus 286^2.

Click the image to open in full size.

Chassis ground - single most important part of the build; complete with a locknut for safety

Click the image to open in full size.

Closeup of the AMB Epsilon 24 board with relay.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

When I first fired it up, DC offset on the speaker outputs initially measured about 0.13 mV for all the channels. Within about 30 seconds however, they all drifted down very close to 0mV on my Fluke 87. In late winter 2017, I built a precision 1khz oscillator (2ppm) from AKITIKA that has proven to be useful for my amp builds. It measures about 1.006 kHz and set to an output of 99 mV, I measured between 990 mV to 1010 mV on each of the Modulus 286 outputs confirming my gain setting of 10X (about 20dB to 20.17dB).

What can I say? Precision performance!

Can't wait to put it to the test in my HT setup, these will be powering my L/C/R mains with 1 channel to spare. They are 96dB efficient with an impedance minima of 4.8 ohms, so no worries there

If you have any questions or comments, please don't hesitate to ask. Thanks for reading!

Best,
Anand.

Last edited by poseidonsvoice; 22nd July 2018 at 11:00 PM.
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Old 22nd July 2018, 11:05 PM   #160
zman01 is online now zman01  Bangladesh
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Mod-286 build thread
Very nice build Anand, congratulations!
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