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Old 16th June 2009, 02:35 PM   #31
iko is offline iko  Canada
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If I may add, it also depends on what you build the buffer for. If you're buffering a headphone amp or a gainclone then you can power the buffer and the rest with a dual regulator like salas' shunt. You can get a stiff psu with low output impedance and low noise that way if you're careful about details. But sure, for something portable, a virtual gnd circuit does make sense; it's all about trade-offs in the end.

Just my 2c.
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Old 16th June 2009, 06:28 PM   #32
Salas is offline Salas  Greece
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Here is the PCB work. Anyone who likes to make, or carry a group buy, I have the Eagle files too. Remember, 2X68R is best for setting the current with no need for sinks on the Mosfet. 3X68R adds 40mA and makes the shunt ones kinda hot.
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Old 16th June 2009, 06:56 PM   #33
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Please wait some more, La Ode will add some functionality to this shunt version. I asked him if he could move the power supplies to the left to avoid ground jumpers and make input and output wiring simpler. He replied that he will change the PCB but it will take some time.
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Old 16th June 2009, 09:52 PM   #34
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I just noticed right and left channel input share the same ground point.
Is this the preferred way of doing things?
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Old 16th June 2009, 09:55 PM   #35
Salas is offline Salas  Greece
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If it did not buzz on Crt should be OK. He did not mention any buzzes.
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Old 16th June 2009, 11:03 PM   #36
tinitus is offline tinitus  Europe
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Quote:
Originally posted by thanh1973
I just noticed right and left channel input share the same ground point.
Is this the preferred way of doing things?

Really
I thought it was one channel only

Well, I would like that
I also like double bridge in supply

btw, whats that with the snail ?



Ahh, got it
I thought it was symmetrical, like in balanced
Its symmetrical supply
Right
That feels much better now
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Old 16th June 2009, 11:46 PM   #37
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Hi Salas could you give us the dimensions of the pcb?
Are they the same as the original with linear regs?

By the way if we can get an order of 100 boards then I can get them made for $5 (US dollars) each + postage costs.
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Old 17th June 2009, 01:01 AM   #38
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I would be interested in 2 pcb if you go ahead.

Thanks, sp
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Old 17th June 2009, 07:11 AM   #39
Salas is offline Salas  Greece
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Quote:
Originally posted by thanh1973
Hi Salas could you give us the dimensions of the pcb?
Are they the same as the original with linear regs?

By the way if we can get an order of 100 boards then I can get them made for $5 (US dollars) each + postage costs.
If you print it out at 124X62mm the Mosfets and Transistors / JFETs pitches look right. I did and compared with the actual semiconductors. The filter caps pitch looks smaller than 4700uF snap in that I compared. But there is pad space to drill wider. Maybe Crt used straight long pin filter caps. I emailed him to give us the intended dimensions. If you want the high resolution files and Eagle files, email me. Jean Paul wants something arranged differently, don't know about that. Me I find the current one practical enough.
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Old 17th June 2009, 07:35 AM   #40
Salas is offline Salas  Greece
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Quote:
Originally posted by tinitus
btw, whats that with the snail ?
I can see that Crt likes System Of A Down. Plus Malakian's short lived assortment ''Scars On Broadway''. About the snail, he is the one to tell us the symbolism if he likes.
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