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Old 3rd November 2008, 10:56 AM   #111
housing is offline housing  Hong Kong
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Hi Spencer,

You've got mail!
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Old 4th May 2009, 10:28 AM   #112
spencer is offline spencer  Hong Kong
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It has been quiet for a while and here I release the D1V33 due to continue interest of D1V3 but without enough 2SJ74 part for the V3 kit!

Here is the photo of complete unit.
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Old 4th May 2009, 10:50 AM   #113
spencer is offline spencer  Hong Kong
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Key change from D1V3:

1. Jfet IV: Replace K170 by K369 which has a higher Yfs about 40mS (double of K170). This will also reduce the input impedance of Jfet IV so that the input point will be closer to virtual ground (measured below 20mV for two K369 in parallel at 1FS). Note that K369 is only limited supply (obsloleted also about 10 yrs ago). 8 pcs sorted Idss will be provided.
2. J74 is eliminated due to obsolete.
3. Use K246GR as the current source of LM336 voltage reference.
4. Add 4 jumpers for SM5842 for selection and thus SM5842 output bit can be set from 18 to 24bits. Thus 24-bit DAC like PCM1704 can be used if the converter board fit PCM63 pin assignment.
5. Re-route supply voltage trace using star ground concept to improve background noise.
6. Add a pad for output couple capacitor V 5mm pitch for Muse BP E-cap or Black Gate E-cap.
7. Various change in resistor and capacitor value and size.
8. PCB will be still 2mm thick but use ROHS solder flash for easier soldering.

The above upgrades will reduce the background noise, improve resolution, quieter music background and sound stage will be more focus. Measured distortion is also improve by about 0.01% in balance mode to about 0.048%.
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Old 4th May 2009, 11:05 AM   #114
spencer is offline spencer  Hong Kong
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Here is the BOM and Cost of kit, only active, capacitors some ICs are provided and kit will be sold as COMPLETE SET to reduce packing efficiency. Receiver chip, DAC chips and DF parts will not be inclued in the kit. See details attached.

Interested can PM me and I can provide full set of document for review.

Spencer
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Old 4th May 2009, 11:13 AM   #115
nico2k3 is offline nico2k3  France
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Interested in yout V33 kit : PM sent

Bye,
Nico
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Old 4th May 2009, 11:23 AM   #116
housing is offline housing  Hong Kong
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Quote:
Originally posted by spencer

The above upgrades will reduce the background noise, improve resolution, quieter music background and sound stage will be more focus. Measured distortion is also improve by about 0.01% in balance mode to about 0.048%.
Hi Spencer,

Do you mean 0.0048%, a typo error?

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Old 4th May 2009, 11:41 AM   #117
spencer is offline spencer  Hong Kong
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In SE mode, the distortion is about 0.5 to 0.6% at 1FS, 997kHz.

In Balance mode, the distortion is about 0.05% at 1FS, 997kHz.

Major distortion is for 2nd and 3rd harmonics and beyond 3rd harmonic is below -85dB to -90dB.

D1V3 has a little bit higher distortion than D1V33.

Measurement do not really impress anyone!
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Old 4th May 2009, 11:48 AM   #118
housing is offline housing  Hong Kong
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OK. I got your meaning.

Measured distortion is also improve by about 0.1% in balance mode to about 0.048%.
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Old 7th May 2009, 12:34 PM   #119
spencer is offline spencer  Hong Kong
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Update circuit 1
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Old 7th May 2009, 12:36 PM   #120
spencer is offline spencer  Hong Kong
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Update circuit 2
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