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Modulus-86  build thread
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Old 16th November 2018, 12:29 AM   #4381
Panelhead is offline Panelhead
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Sometimes hear people comment that some passive parts are directional. Resistors, film caps, even wire have a direction. I orient with the printing readablefrom source to output just in case.
I really doubt these passives are directional. Especially with ac signal.
I do truly beleive the polarized caps, diodes, and regulators are directional.
Hope this helps.
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Old 16th November 2018, 12:33 AM   #4382
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Originally Posted by tomchr View Post
Those who'd like a bit more of a turnkey build experience should consider my newly launched Modulus-186 and Modulus-286 Rev. 2.0.

The intro sale will close by November 30th. I expect to have the modules in stock by then.

The Modulus-186 is basically a Modulus-86 in SMD, professionally assembled. I've started a separate vendor's thread for it.

Tom
I am going looking. The turnkey is not an interest, but using SM should allow shorter paths and better performance. That seems to be key will these composite amps.
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Old 16th November 2018, 02:02 AM   #4383
tomchr is offline tomchr  Canada
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Quote:
Originally Posted by cloud1972 View Post
hi folks just building amp 86 is the direction of c10 (wima film capacitor) important if so which way round should it go
Nope. Film capacitors are not polarized.

Passives such as resistors and film/ceramic/mica capacitors are not polarized. I generally install them such that they are all easy to read for verification and troubleshooting.

Semiconductors and electrolytic and tantalum capacitors are polarized, thus, must be installed following the markings on the board.

Note that some believe passive components "sound better" when oriented one way or another. To the best of my knowledge, there is no science to back up these claims.

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 16th November 2018, 02:04 AM   #4384
tomchr is offline tomchr  Canada
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Quote:
Originally Posted by Panelhead View Post
The turnkey is not an interest, but using SM should allow shorter paths and better performance. That seems to be key will these composite amps.
That's part of the design for sure. You'll find the Modulus-186 and -286 vendor threads here:

Neurochrome Modulus-186: 40W (8Ω); 65W (4Ω) @ <-120dB THD Composite Amplifier Module
Neurochrome Modulus-286: 65W (8Ω); 125W (4Ω) @ <-120dB THD Composite Amplifier Module

Pictures show the prototype builds of the two amp modules. The final version will feature Neurochrome Blue circuit boards and metal back LM3886es (LM3886T/NOPB, to be specific).

Tom
Attached Images
File Type: jpg MOD186_PROTO_Module.jpg (306.0 KB, 218 views)
File Type: jpg MOD286_PROTO_Module.jpg (315.6 KB, 220 views)
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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

Last edited by tomchr; 16th November 2018 at 02:07 AM.
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Old 16th November 2018, 08:00 AM   #4385
BYRTT is offline BYRTT  Denmark
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Modulus-86  build thread
Video over at YT Are Your Capacitors Installed Backwards?

LINK: YouTube
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Old 16th November 2018, 01:51 PM   #4386
asuslover is offline asuslover  Romania
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Modulus-86  build thread
Byrtt, thank you for that link!
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Old 16th November 2018, 02:34 PM   #4387
tomchr is offline tomchr  Canada
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I'd add a correction to that video. I didn't watch the full 45 minutes of it, but in the introduction he mentions that film caps have a polarity. That's incorrect. What they do have is two sheets of film rolled up with a sheet of dielectric in between. As result, one sheet of film/foil will be on the outside. You can reduce hum pickup (important in phono stages and tape circuits) by grounding the outer foil in cases where the caps connect to ground. In those cases, there's usually a marking on the package to indicate which lead is connected to the outer foil.

When in doubt, check the manufacturer's data sheet.

For the capacitor in question in the Modulus-86, there is no polarity. It can be installed either way.

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 16th November 2018, 02:43 PM   #4388
zgtc is online now zgtc  Europe
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Modulus-86  build thread
Quote:
Originally Posted by tomchr View Post
In those cases, there's usually a marking on the package to indicate which lead is connected to the outer foil.
Yes, that's the theory, but what that video shows is that these indications are often wrong. If that is really the case, it looks quite surprising to me that no one else had ever noticed this behaviour. Looks quite "suspicious" to me at the very least.
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Old 16th November 2018, 02:56 PM   #4389
BYRTT is offline BYRTT  Denmark
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@asuslover, welcome.

@tomchr, about that video also will guess we go in small shoes here regarding application of modern small footprint circuits as your modules

Many years ago myself diy some tube guitar amps including overdrive stages that is not especially silent as is, maybe that application will benefit a recheck of how coupling caps are wired up.
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File Type: png 1001.png (280.7 KB, 174 views)

Last edited by BYRTT; 16th November 2018 at 03:12 PM.
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Old 16th November 2018, 11:19 PM   #4390
cloud1972 is offline cloud1972  United Kingdom
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thanks guys for the info it was the small dot on the one side of the cap that made me question direction so thanks for the help
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