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Old 6th May 2005, 08:00 PM   #251
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Here's a compact, PS module. I presently favour 100/50 BG N caps directly beside the chip and 1000/50 BG STD on rectifiers board, no other additional bypasses, no snubber either
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Old 6th May 2005, 08:06 PM   #252
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A very simple chassis can be built using minimum skills and resources. The main structural support is provided by 1 x 3 flat bar, about 12" long. There is another small bar in a back, creating footing and a single cone in front ( directly under the chip location). A flat piece of aluminum creates rear panel, where power module (with a switch and fuse) is installed. A similar panel in front (I didn't install it yet), supports input and output jacks.

I didn't notice any hum or interferences with that type of open design chassis, and the sound is very pure without the veil and coloration that more fancy builds impose.
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Old 6th May 2005, 09:00 PM   #253
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Peter,
I have a problem
I put in one set of the bridge diodes in backwards.

It was the set used for the analog V+, so I at least blew up the surface mount regulator.

Right now, it only looks like the regulator attached to the 75179 is working right, it puts out 5V.

The two regulators connected to the 8412 are putting out around 8V?

I will double check this later, but that is what I found a little while ago.

At least I did not install any IC's, only passives and the regulators. Also, fortunately, those blackgates are bipolar, so I did not hurt them.

Randy
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Old 6th May 2005, 09:39 PM   #254
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Check what it's written on the other 2 regulators. I'm pretty sure I supplied 5V type, but you never know. Normally, it should be 5V even without chip mounted.

You might had also blew the diode, so check the voltage after 20R resistors. You should be getting around 11V there (before regulators). Tell me which parts need replacing and I will send them to you.
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Old 6th May 2005, 10:19 PM   #255
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Quote:
Originally posted by Peter Daniel
Check what it's written on the other 2 regulators. I'm pretty sure I supplied 5V type, but you never know. Normally, it should be 5V even without chip mounted.

You might had also blew the diode, so check the voltage after 20R resistors. You should be getting around 11V there (before regulators). Tell me which parts need replacing and I will send them to you.
Hi Peter
Thanks for the support.
I checked the input voltage to the regs, it was around 12V.
I just remembered, U1 (which works) has the output cap installed, but U2 and U3 (don't work) do not have the output caps installed yet, I can't install those until I install the 8412. I think the regs want some output capacitance, so I may take a chance and install the 8412, then install the output caps, and see if U2 and U3 output 5V.

Randy
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Old 6th May 2005, 11:19 PM   #256
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You can always install the caps temporarily, in the CS8412 holes. You don't even have to solder them, just make sure the pins are in contact with through hole plating.
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Old 7th May 2005, 12:37 AM   #257
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Quote:
Originally posted by Peter Daniel
You can always install the caps temporarily, in the CS8412 holes. You don't even have to solder them, just make sure the pins are in contact with through hole plating.

Hi Peter,
I did not want to use the BG's, but I dug up an old cap, and tried it. Those regs work much better with a cap on the output.


Everything seems to work fine. The three regs each put out a little over 5V, and the SM reg puts out about 7.9V. I remember reading that you thought this DAC sounds better if you give it a little under 8V, which is the max voltage it takes.

There are a couple of "tricks" that took me a little to figure out. One was having to cut the 4 end pins off the 8412, but I looked at a picture you posted to figure that out.

The other one, which I should have figured out, was I needed to solder two caps to the 8412 pins. I should have done it before I installed the 8412, but I did not figure it out till after, but I managed.

Randy
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Old 7th May 2005, 03:47 AM   #258
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It works.
Letting it burn in now, those blackgates take a while before they sound good.

Randy
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Old 9th May 2005, 07:57 PM   #259
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Quote:
Originally posted by randytsuch
It works.
Letting it burn in now, those blackgates take a while before they sound good.

Randy

Yes, I found the first 15 hours or so the sound did change a lot.
I also had to modify my USB soundblaster to communicate with my DAC because it only had optical out. Can't burn everything to CD you know...
Click the image to open in full size.
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Old 15th May 2005, 02:08 AM   #260
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Quote:
Originally posted by Peter Daniel
Actually, I am seriously considering coming up with a phonostage.
Hey Peter, any news on that proposed phono stage ? I just got a stack of old jazz LPs, 2 turntables and no way to listen to these wonderful records. You got to help me. Pleaaaaaaaaaaaaaaaase !!!!!!!!!!!!!!
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