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M³ amplifier build discussions thread - Page 5  

post #61 of 828
3/9/05 at 12:27am
Quote:
Originally Posted by n_maher
for public consumption.
I always assumed anything put up here was for public design review, one only "consumes" what one understands, at one's own risk.

In any case, my spreadsheet is in progress as I pick parts, I'd love to see yours if you think you're done.
post #62 of 828
3/9/05 at 12:54am
amb has the spreadsheet for review. I'll be happy to share it with everyone else after any comments are taken under consideration.

And my only fear about releasing it right now would be that I made some idiotic mistake and that some unknowing individual might waste time and money as a result.

Nate
post #63 of 828
3/9/05 at 5:10am
Let me share what I put together so far
(resistor part numbers are not provided)
Mouser
--------------------------------------------------------------------------
BIAS-OP 652-3296W-1-102
BIAS 652-3296W-1-502

C1 80-C315C330J1G
C2/C8 505-MKS21/63/10 (*you got to order 50*)
C3 80-C315C221J1G
C4/C5 647-UPW1H101MPD (100uF 50 volt)
C6 505-MKP20.1/100/5
C7 647-UPW1H331MPH (330uF 50V)
Cbb 505-MKP20.22/100/5

R9 262-1.0 (Xicon) 594-5083NW1R000J (Vishay)



Q2/Q5+ 511-2N3904 (ST)
Q5- 511-2N3906 (ST)
Q3/Q4 512-2N5486
Q6 512-2N5484

D1 512-1N4001GP
TLE 595-TLE2426CLP

Aavid-Thermalloy 531202B00000 (2") 532-531202B00
TO-220 heat sink mounting Kit 532-4880 (S) (M)
Thermal grease (wakefield) 567-120-2
DIP Socket 575-113308



Digikey
--------------------------------------------------------------------------
BIAS-OP 3296W-102-ND
BIAS 3296W-502-ND

C1 399-1949-ND
C2/C8 BC1622-ND
C3 399-1901-ND
C4/C5 P10323-ND (100uF 50 volt)
C6 BC2054-ND
C7 P11258-ND (330uF 50V)
Cbb BC2062-ND

Q1+ IRFZ24N-ND
Q1- IRF9Z34N-ND
Q2/Q5+ 2N3904RLRAOSCT-ND (OnSemi cut tape)
Q5- 2N3906RLRAOSCT-ND (OnSemi cut tape)


R9 P1.0W-2TR-ND (ECG series)
D1 1N4001GICT-ND

OPAMP AD8610AR-ND
AD8065AR-ND
AD843JN-ND
AD845JN-ND
OPA637AP-ND
OPA627AP-ND

TLE 296-1994-1-ND (TLE2426CLPR)

Heat sink Aavid-Thermalloy 531102B00000 HS284-ND
Thermal grease HS243-ND
DIP Socket ED5308-ND
Aries 08-350000-10 A724-ND
post #64 of 828
3/9/05 at 5:56am
Thread Starter 
I have updated my parts list page with Mouser and Digi-key part numbers under the "Parts Recommendations & Options" section. Check it out.
post #65 of 828
3/9/05 at 6:21am

picking jfets for classA bias cascode

both Q3 and Q4 are 2n5486, do I have to pick (hand select) a jfet for Q4 with IDSS min > IDSS max of Q3 ? Or take a different combination (2n5484/2n5486 or 2n5486/pn4392) ?
post #66 of 828
3/9/05 at 7:07am
Thread Starter 
Quote:
Originally Posted by steinchen
both Q3 and Q4 are 2n5486, do I have to pick (hand select) a jfet for Q4 with IDSS min > IDSS max of Q3 ? Or take a different combination (2n5484/2n5486 or 2n5486/pn4392) ?
Don't use the 2N5484 here. The Idss would be too low for the intended application.

If you want to hand pick, use the 2N5486 with the higher Idss for Q4, however this is not critical, because there is a 1K pot to dial up desired current.
post #67 of 828
3/9/05 at 5:52pm

Par-Metals Case and some issues

Sometimes I just can't wait So I went and ordered a Par-Metals case, here are some pics:

Par-Metals Series 20 case 12"W X 3"H X 8"D (20-120803 it think?)






I'm using the 1.5" heatsinks so keep that in mind. With 1.5" Heatsinks and .75" standoffs you get about .5" clearance from the top of the case. To the left is a STEPS board for reference.

Some issues:

1). The holes in the PCB for mounting screws do not line up with the ones pre-drilled into the case. Keep in mind there are only two predrilled holes in the case for mounting so you would have to drill two new ones anyway. The holes in the case are roughly 6" apart (center of hole to center of hole running the depth of the case) while the holes on the PCB are roughly 6.5" apart.

2). If you are using the ALPS pots for volume and bass boost and you want them to mount in the center of the panel, you're going to have to mount the board as close to the front panel as possible which means drilling through the bottom plate as well as the front frame for the front panel.

Just thought people would like to see some pics.
post #68 of 828
3/9/05 at 6:01pm
Those bastages sent you MY case!

Seriously, I have had that exact case on order also since Friday, Feb. 25th (12x8x3, natural anodize, countersunk screws, no top vents).

Chris
post #69 of 828
3/9/05 at 6:03pm
Quote:
Originally Posted by Pars
Those bastages sent you MY case!

Seriously, I have had that exact case on order also since Friday, Feb. 25th (12x8x3, natural anodize, countersunk screws, no top vents).

Chris
Oh my has top vents and the screws are not countersunk...just a stock job, crazy thing is I ordered it on Monday...that's fast!
post #70 of 828
3/9/05 at 6:32pm
If anyone would like an excel spreadsheet that lays out all of the major components that you would need to populate an MMM board just PM me your email address. Or if someone with FTP ability would like to host it that would be nice.

The spreadsheet offers one possible combination of parts that have been reviewed by a member of the design team. It is by no means the cheapest or the most expensive that you could select. And it is a long way from being as comprehensive as the PIMETA spreadsheet that was circulated a while ago. It does however, offer hot-links to all of the mouser parts that you need. So just click the spreadsheet, add to Mouser order, and you're on your way. It also makes maximum use of amb's audio shop, obviously you can get some of these parts from other vendors if you choose to do so. [edit] It also includes all of the required resistors for the stock MMM gain configuration. [/edit]

Last but not least, I reserve the right to stop offering this spreadsheet if I get 100PM's. I work full time in addition to being a Head-fi addict so please allow a day or so before you send me another PM.

Nate
post #71 of 828
3/9/05 at 6:36pm
I can host it. Sent you a PM


/U.
post #72 of 828
3/9/05 at 6:45pm
Nisbeth should have the spreadsheet now. Please hold off on sending PM requests until we see if hosting it on Nis's site will be sufficient.

N
post #73 of 828
3/9/05 at 6:51pm
File is up: http://www.nisbeth.dk/uffe/files/head-fi/mcubed-bom.xls


/U.
post #74 of 828
3/9/05 at 8:27pm
Quote:
Originally Posted by thrice
1). The holes in the PCB for mounting screws do not line up with the ones pre-drilled into the case. Keep in mind there are only two predrilled holes in the case for mounting so you would have to drill two new ones anyway. The holes in the case are roughly 6" apart (center of hole to center of hole running the depth of the case) while the holes on the PCB are roughly 6.5" apart.

Those holes are for mounting the feet.
post #75 of 828
3/9/05 at 8:45pm
Quote:
Originally Posted by MisterX
Those holes are for mounting the feet.
I knew that.





















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