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Old 2nd February 2007, 04:00 PM   #1551
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Looking very good

And some sort of Phonocube (Phonoclone)?
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Old 2nd February 2007, 04:04 PM   #1552
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Quote:
Originally posted by paulomartires
And some sort of Phonocube (Phonoclone)?
RJM offers such thing, so I will not pursue that avenue.
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Old 2nd February 2007, 10:14 PM   #1553
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Here is the schematic of VSPS based phono stage using Allen Wright's modified curve, with the additional zero at 3.2 S.

The component types are probably critical and are based on my previous experiments with DAC and buffer. Good thing was that most of the parts came from my other projects as well. All resistors are Caddock MK132, RIAA caps are 10n ERO 1830 and 3n3 Wima FKP2. I use separate transformer per channel: Hammond 229D24. The only bypasses after regulators are BG N 4.7/50. If you select OPA627 for low offset you may not need output coupling cap (offset less than 2mV).

This is actualy a very good sounding circuit. It is also simple enough to be built on a proto board.
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Old 3rd February 2007, 05:41 AM   #1554
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Hi Peter,

Thank you for your prompt reply.

Ray Simmons.
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Old 5th February 2007, 04:34 PM   #1555
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Hi there Peter!

I'm just about to add a much-needed heatsink to my Audiosector Gainclone. I'm using a piece of quarter inch thick copper plate, and the size is approx. 4" x 3.5".

Having never attempted to drill holes in copper plate before, is this do-able just using a standard electric drill with perhaps a bit of oil or methalated spirit to aid the cutting action of the drill bit?

Lastly, once done and I've polished the copper up, is it just a case of lightly sealing it with some spray metal lacquer or is this not necessary? Does the lacquer inhibit the heat-absorbing qualities of the copper at all?

Cheers,

- John
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Old 5th February 2007, 04:52 PM   #1556
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Drilling in copper is about the same as drilling aluminum, just slightly harder, so your regular tools shoul dbe fine.

Sealing with laquer is a good idea, one product is specifically suitable for that purpose: http://www.krylon.com/main/product_t...roduct_details

I also used Danish Oil for protecting copper and it worked well. Those finishes should not affect thermal dissippation as long as the areas where chip installs and copper connects with the rest of the chassis are not covered.
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Old 5th February 2007, 04:56 PM   #1557
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You can cover the chip with masking tape and wrap the board to protect it before spraying.
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Old 5th February 2007, 04:56 PM   #1558
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Thanks for the super-speedy reply Peter Thanks also for the masking tape tip Brian.

I'll get drilling and polishing then!

Thanks a mil!

- John
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Old 19th February 2007, 04:23 PM   #1559
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Default Pass Ono boards and power supply

Peter Daniel:

I was wondering if you sell PCBs for either the Pass Ono or the associated power supply. Someone referred me to you and figured this was the proper place to ask

Thanks!
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Old 19th February 2007, 07:00 PM   #1560
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I don't sell them, but recently ordered 2 sets, so one may be available. But not earlier than a month or so.
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