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Neurochrome Modulus-286: 65W (8Ω); 125W (4Ω) @ <-120dB THD Composite Amplifier Module
Neurochrome Modulus-286: 65W (8Ω); 125W (4Ω) @ <-120dB THD Composite Amplifier Module
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Old 20th December 2020, 09:33 PM   #191
zman01 is offline zman01  Bangladesh
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Neurochrome Modulus-286: 65W (8Ω); 125W (4Ω) @ <-120dB THD Composite Amplifier Module
groovybassist,

Great to know that you are enjoying your Modulus-286. I enjoy my Mod-86 on a regular basis.

What speakers are you using? Are you using a buffer or a preamp?
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Old 20th December 2020, 09:54 PM   #192
groovybassist is offline groovybassist
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zman01:

I'm using Graham Audio LS6 speakers. The bass on them can be a bit rich, which is why the Mod-286 impressed me so much in terms of bass pitch/detail. Much more expensive amps haven't been able to coax out that level of clear pitch definition and detail in the bass registers.

On an interim basis, I'm using the pre-out function of my Audia Flight FL3S integrated amp into the Mod-286. I'm waiting to see what products Tom comes out with (likely in his TCA brand) to determine next steps. Would love to see a DAC/Pre from him, but if he decides to go down the DAC only route or do nothing, I'll need to make other plans. Tom's engineering chops are a rare breed - would be great to take advantage of as many aspects of that expertise as possible. As an FYI, I also have his TCA HPA-1 headphone amp - all the same characteristics as the Mod-286.

-Mike
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Old 20th December 2020, 10:12 PM   #193
zman01 is offline zman01  Bangladesh
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Neurochrome Modulus-286: 65W (8Ω); 125W (4Ω) @ <-120dB THD Composite Amplifier Module
Mike,

Thank you for sharing details of your speakers and set up. I use one of Tom's buffers in front of my Mod-86, and my DAC output goes into the buffer.

Looks like that you're all set for now - enjoy and happy holidays!

- Zia
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Old 21st December 2020, 02:13 PM   #194
groovybassist is offline groovybassist
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Zia:

Thanks - hope you enjoy your holidays as well!

-Mike
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Old 22nd December 2020, 06:51 AM   #195
tomchr is offline tomchr  Canada
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I guess I'm late to the party... Mike, thank you for your review. I'm thrilled that you like the amp.

I have materials for another four of these stereo amps. Maybe I should build some more and start advertising them...

Tom
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Modulus-86, 186, 286, & 686: 40-240W (8Ω), <-120dB THD. HP-2 Headphone Amp: 660mW, <-130dB THD. Taming the LM3886.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 22nd January 2021, 06:08 AM   #196
Edgar77 is offline Edgar77  Thailand
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Neurochrome Modulus-286: 65W (8&#937;); 125W (4&#937;) @ &lt;-120dB THD Composite Amplifier Module
Default Lithium Batteries as power supply?

I am new to building amplifiers and maybe the following is a stupid idea. Please tell me what you think.

It seems everybody puts a lot of effort into the power supply of this amp (and any other powerful amp). When I understand it correct one option is a regulated switching power supply. Another option is a big transformer and a relative expensive power supply circuit.
The idea is always to get a clean, powerful and stable supply for the amp.

How about option 3, batteries?

I would think that Lithium batteries should be almost perfect as power supplies. They have no switching noise, no hum, stable voltage, and are able to supply lots of current if necessary.

This is a sample of what batteries I have in mind:
4 times ZIPPY Compact 4200mAh 4S2P 30C LiFePo4 Pack
ZIPPY Compact 4200mAh 4S2P 30C LiFePo4 Pack | HobbyKing

2 in series supply maximum 8*4.2 = 33.6V
When the battery is not full anymore it should be usable until at least 3.5V, equal to 8*3.5V = 28V

30C with 4200mAh means, at least in theory, that they can supply 30 x 4.2A = 126A constantly and even more for peak current supply.

Is all that feasible and a good idea?

Obviously an amp with batteries would only be usable for a limited time. I guess the batteries above should be able to supply power for an hour when the amp is used to the max. In real life I guess they should be able to supply the amp for at least two hours, probably more.

Obviously the batteries must be charged. But that is relative cheap and does not require a sophisticated power supply.

What do you think? Is that a crazy idea?

Part of my inspiration comes from the fact that Danny Richie from GR-Research runs his best presentation system on batteries for optimal sound quality.
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Old 22nd January 2021, 06:46 AM   #197
tomchr is offline tomchr  Canada
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With batteries you replace a pretty simple circuit (transformer, rectifier, capacitors) with a complicated charger and battery chemistry. Depending on where the battery is on its discharge curve, the output impedance of the battery could be higher than that of a power supply.

You'd need 14 batteries to create 28-30 V.

But yeah... It could be done. One could also entertain the thought of using batteries from portable tools. Some of them have pretty serious capacity.

Tom
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Modulus-86, 186, 286, & 686: 40-240W (8Ω), <-120dB THD. HP-2 Headphone Amp: 660mW, <-130dB THD. Taming the LM3886.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 22nd January 2021, 07:27 AM   #198
Edgar77 is offline Edgar77  Thailand
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Neurochrome Modulus-286: 65W (8&#937;); 125W (4&#937;) @ &lt;-120dB THD Composite Amplifier Module
Thanks Tom

with the 4S battery packs which I mentioned above 4 of those would be necessary. All 4 together cost about 200USD.

You are the developer of this amp so I am sure you will be able to answer this: Would the sound quality with batteries be better than with any mains connected power supply?
And if not, why not? Or is it maybe measurable but not audible?
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Old 23rd January 2021, 07:26 AM   #199
tomchr is offline tomchr  Canada
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I think the sound quality would be the same. The amps in the Modulus-series does not care (much) about the power supply due to the error correction employed in those amps.

Tom
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Modulus-86, 186, 286, & 686: 40-240W (8Ω), <-120dB THD. HP-2 Headphone Amp: 660mW, <-130dB THD. Taming the LM3886.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 23rd January 2021, 09:46 AM   #200
Edgar77 is offline Edgar77  Thailand
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Neurochrome Modulus-286: 65W (8&#937;); 125W (4&#937;) @ &lt;-120dB THD Composite Amplifier Module
Thanks Tom

can you please explain a little how that error correction works. Or maybe you have a link to a place where you explained it already.

I know you develop high quality products and it is not my intention to doubt what you say. I just want to understand it.

Because as far as I understand unregulated power supplies like i.e. your Power-86 and others don't supply a steady voltage especially if the amp demands a lot of power.
I.e. if the amp does not demand much power then maybe the output voltage will vary between maybe 36.00V and 36.01V - just as an example.
But when the amp demands a lot of power then, as far as I know, the output voltage of the power supply will vary more. I.e. 100mV or even more difference with 100Hz frequency.
Is that correct?

Why does that difference in the input voltage of the amp not matter?
And what would be a value (ripple?) that would matter? I.e. 500mV or how much would be acceptable for your amp?

It would be great if you can explain this a little. I like to learn how this works.
Thanks
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