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MagnumOpus 11th June 2012 08:12 PM

LM3875 (AudioSector) Build

I ordered the regular kit from Mr. Daniels and I have recently soldered up the boards using Takman Rex resistors instead of the ones that came with the kit. Haven't the foggiest if they sound different or if I noticce the difference but the name sound cool and they look good :D

I ordered a 300va 2x22 shielded and encapsulated toroid for this application, I should receive it shortly, they had a 30 day delivery period for custom transformers.

I will make this a power amp only, since I have a DC B1 Mesmerize board waiting to be populated also. Pics to come.


MagnumOpus 6th October 2012 10:03 AM

Finally, I have received my chassis and custom toroid. I dry fitted it just now, and its a tight fit, but it will work just fine :)

Nice black chassis with oversized heatsinks from Silicon Ray. Only thing about it is that the mounting holes for the back plate is somewhat off, so I can only use three out of four screws, but otherwise fine. Looks cool.

The toroid itself ways just as much as my spare Denon amp, so the finished thing is going to be quite heavy.

I have som nice CNC connectors from hificollective, and the RCA's barely fit, they are actually a couple of mm's to short, but I managed to fasten them ok enough.

I'll post some pic's later when my 2 year old is n't runing around :)

Man, I can't wait to get this up and running. I started to get so inpatient that I almost ordered a finished Patek instead :) But that would contradict my intentions, so I am glad I didn't.

MagnumOpus 5th November 2012 02:56 PM

I have hooked up the transformer and I have power, the LED lights up, but I am about to measure the voltage between V+ and PG+ but I have no Idea what to set my DMM to.

Puffin 5th November 2012 03:06 PM


Marra 5th November 2012 03:10 PM

Hope you enjoy the sound.

MagnumOpus 5th November 2012 03:18 PM

Puffin: Vdc..Is that the V with the ~ after it?
I tried this but I didn't get anything near read thousand something...

mikejennens 5th November 2012 05:08 PM

V~ is AC. VDC is usually a solid line with a dashed line under or over it.
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MagnumOpus 5th November 2012 05:10 PM


Originally Posted by mikje (
V~ is AC. VDC is usually a solid line with a dashed line under or over it.
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Thank you so much.

MagnumOpus 5th November 2012 05:14 PM

I read 40.2 and 3 between PG+ and V+, and 39.9 /40.00 between PG - and V-

Transformer is 300va 2x22

MagnumOpus 5th November 2012 05:38 PM

Actually, after hooking up the ground wires of the inlet and toroid, I read approx 46 on both channels...differs 0.2-0.3...

Sorry about the size of the pic, I haven't a clue how to make it bigger...
Bigger pic at this url:

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