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Old 10th February 2018, 06:04 PM   #4221
Mod Man is offline Mod Man  United States
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Thank you everyone.
MASantos,
The Chassis is a Hi-Fi 2000 from the diyAudio store but heavily modified, literally. I added so much aluminum and some copper heat spreaders that I can hardly lift the thing.
Eric,
thank you,
I worked real hard on minimizing the number of wires and hid all that I could. Most of the wires are exiting the back side of the boards.
Nelson Pass,
I have been listening to your design all afternoon and I am amazed. How can a simple 2 gain stage amp with so few parts sound so wonderful?
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Old 10th February 2018, 06:20 PM   #4222
Mod Man is offline Mod Man  United States
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Some of the metal parts.
DSCN0652.jpgDSCN0667.jpgDSCN0664.jpgDSCN0645.jpg
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Old 10th February 2018, 06:32 PM   #4223
luvdunhill is online now luvdunhill  United States
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That certainly is one way to avoid the hassle of making and aligning a L-bracket ..
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Old 10th February 2018, 06:59 PM   #4224
WalterW is offline WalterW  Netherlands
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Join Date: Oct 2012
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Pictures of your diy Pass amplifier
Very nice build, clean and symmetric!

Why is there a sort of Keratherm between cupper bar and alu bar?
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Pass F5, F5Tv3, ACA, Aleph J, DDDAC1794, DCB1, BA3-preamp, VFET CSX1, Pass F6, Pass M2-HPA, VFET-X balanced, Pass J2
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Old 10th February 2018, 07:22 PM   #4225
Mod Man is offline Mod Man  United States
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The F5 audio output is connected to the drain of the mosfets so I mounted them directly to the copper heat spreader, no electrical isolation between transistors and copper. I added a thermal interface product between the copper bar and the grounded aluminum bar to electrically isolate them. There are also nylon bushings in the screw hole to isolate the mounting screws. I figured this would be a good way of transferring heat away from the output devices. Works very well and does not add any significant capacitance between output and ground.
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Old 10th February 2018, 07:52 PM   #4226
WalterW is offline WalterW  Netherlands
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Pictures of your diy Pass amplifier
Clever!
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Pass F5, F5Tv3, ACA, Aleph J, DDDAC1794, DCB1, BA3-preamp, VFET CSX1, Pass F6, Pass M2-HPA, VFET-X balanced, Pass J2
'If you see me talking to myself, don't worry. I'm getting expert advice'
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Old 11th February 2018, 04:01 PM   #4227
JSA1971 is offline JSA1971  Canada
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Mod Man that is an amazing piece of diy, absolutely gorgeous! May I ask what power button you used on the front? Is it back lit?
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Old 11th February 2018, 05:14 PM   #4228
Mod Man is offline Mod Man  United States
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Thanks JSA1971.
Ok, the power button has a blue backlit ring light. Mouser part ULV7F2G11341 E-Switch | Mouser
It is a double pole 3 amp switch wired in parallel for 6 amps that may or may not be big enough, still testing.
Presently using NTC inrush current limiters but may have to go with a relay or a soft start circuit if the switch welds itself closed. I have had that happen in other projects.
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Old 18th February 2018, 07:21 PM   #4229
Gregje is offline Gregje  United Kingdom
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Hi,

This is my new headphone amplifier. I've got the pcb on his forum. The box is the nicest one I have cobbled together so far... Each new (Pass) amp I make has a better chassis...

Happy camper here.
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Old 18th February 2018, 08:28 PM   #4230
zygibajt is offline zygibajt  Poland
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Join Date: Jun 2003
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Quote:
Originally Posted by Rodeodave View Post
Case stack for some upcoming builds
Can you name the cases. Are these or some of these chinese ebay enclosures? I'm lookibg for some. Nice bikes too, though I run the bicycle store I can't guess what the brand it is. All the brands look the same these days anyway. In the vintage 90-ties times pretty much only Yeti used this colour finish.

Kind Regards
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