Build a 2x200 W Modulus-686 Power Amplifier in a Weekend With Neurochrome
Вставка
- Опубліковано 11 лют 2025
- Build your own ultra-low distortion audio power amplifier in a weekend with Neurochrome. This video offers a step-by-step guide to building a stereo Neurochrome Modulus-686 DIY power amplifier. The Modulus-686 is a composite amplifier based on six National Semiconductor (now TI) LM3886 amplifier ICs operated in bridge-parallel (BPA). It provides 125 W into 8 Ω and 200 W into 4 Ω when built as shown is this video. The Modulus-686 uses the Neurochrome Modulus error correction to achieve vanishingly low distortion levels, which is why the Modulus-686 sounds so good. This audiophile amplifier has unseated many marquee names. Build yours in a weekend!
Thanks, very impressive, and a quality and enjoyable video to watch, watching this from England in the UK
Great video! Thanks for doing cool stuff for all of us!
very concise and clear instructions , i assume that the trigger point is where you turn the amp on ?.
You turn the amp on either with the push button on the front panel or with the 12 V trigger. Many higher end preamps have a 12 V trigger output that can be used for this.
Hello Tom. Do you provide a full component bundle to purchase everything needed to assemble this. A one-stop-shop buy now transaction from you. Thanks
I usually don't. But in this case I do. I have parts for another two amps that I can sell as kits for those interested. Just toss me an email or go through the Contact Us form on www.neurochrome.com to inquire.
Are there CAD files for the ModuShop 3U/300 chassis? Also, the link to the chassis on your resources page goes to a 'product not found' page.
I need to make a small tweak to the 3U/300 drawing for the chassis shown in the video. I need to make sure that the new one-piece brackets will fit. Then I'll get the CAD drawing on the product page. I'll do my best to get to that tomorrow (Wed. Nov. 22). All the drawings currently there load for me. There's a .pdf and a .dwg version for each.
The CAD drawings have been updated. As far as I can tell all the links work. I have links to chassis both for the full power version and to the Safe-n-Sane.
I think the build is cool, but I think you should talk more about why it is a good amp. Is it low distrotion, what are the options for output buffers, sound tuning etc. Or take another person in and have them listen and also talk about how it compares to other amps you have. Just my 2 cents.
I go into quite a bit of detail of what makes it a good amp on the Performance Graphs tab of the MOD686 product page: neurochrome.com/products/modulus-686
I'm really interested in making one of these. What's a rough estimate of the total cost, not including tools?
Amp modules: $1k; power supplies: $180; ISS: $190; Guardian-86: $200; Connectors, switches, etc.: $100ish. Chassis, including modifications, around $500 (so take advantage of their Black Friday sale!) So around $2300 give/take. All numbers USD.
Thanks!@@Neurochrome2010
Why do you connect the Shield (Pin 1) to the Input-Board of the amplifier and not just to the chassis?
The connection to pin 1 provides a return path for the EMI/RFI filter on the Buffer. If you want the filter to work you have to make that connection. It also establishes a common-mode voltage for the input buffer.
@@Neurochrome2010 i didnt see a full schematic of your whole amplifier builds... but am i correct if assume that you leave your power supply ground floating? in that case it would make sense to me redirecting the shunted EMI/RFI to Pin 1 because else theres no return path.
Correct. I usually don't ground the output of the power supply. I do connect the mains protective earth ("ground") to the chassis. That one is mandatory. I then connect XLR Pin 1 to ground and to the Modulus-686 boards. I could connect the PSU ground to the chassis star point if I wanted to as well, but I've left that as an exercise for the reader. :)
Love it, I have said it before, but i'll ask again...... Can you do an insane 686 monoblock build?
Contact me by email or the Contact Us form on www.neurochrome.com. I'm happy to build such an amp if you're willing to buy it.
Lækker forstærker Tom. :) Mvh
Hallo,from Germany,thanks for great video.,but need I,and preamplifier to use it,in home?????
Yep. It's a power amp. You'll need some sort of volume control. I use the volume control that's built into my DAC.
@@Neurochrome2010 have u a video,for volume control,that's built one?????
Not yet.
Is there a torodial transformer option?
Sure. I designed the Power-686 for that use case. A 2x22 VAC @ 400-500 VA would be good for a Safe-n-Sane build. 2x25 VAC @ 500-800 VA for a full-power build.
Have you designed any car audio amplifiers?
Not directly. Some have used my Modulus-86 in a car.
@@Neurochrome2010 What kind of modification would be needed to change this from AC to 12V DC on amps like this? Cleanly.
The folks who have used my amps in their cars have used an SMPS to go from +12 V to ±27-36 V.