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Old 27th September 2005, 12:33 PM   #21
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Quote:
Originally posted by maria_andersson
if less is added then less is too be understood, which I assume is the hard part
Very well put, may become a classic audio phrase in the future.
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Old 27th September 2005, 12:52 PM   #22
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Quote:
Originally posted by maria_andersson
I think Jacco agreed to your idea with the input buffer PA. Does an input buffer like that help to keep the feed from being 'drained' if you use long interconnects? Or is it just a better DC blocker?
An input buffer makes a high impedance input which makes it much easier to interface any signal source and the buffer can drive any load like a low impedance inverting gainclone.

If you have an input buffer you can also add a volume pot without any special considerations.
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Old 27th September 2005, 01:21 PM   #23
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Jacco: thanks (I guess)

PA: OK, I get it, I think. A high impedance load is easier load for the preamp since it will 'drain' less current. A current drain would alter the signal amplitude right? Same as with low impedance speakers I guess. In general you would want to have as high impedance as possible on the input side?

Eitherway I will incorporate the buffer in the PCB and see what it looks like.
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Old 28th September 2005, 04:48 PM   #24
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Hello again, I'm curious, is there any alternative to the AD8620 which is not in SOIC package but DIL8?

Thanks in advance
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Old 28th September 2005, 07:49 PM   #25
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Hello

Well in your case I guess P-A ment AD8610 (the single version of 8620) P-A used the dual one because he used one channel as the inputbuffer and the otherone as the servo ( i think).

Nevertheless, it's still soic so look at OPA627 & OPA134 from TI, 627 = better 134 = cheaper

/Tobias
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Old 28th September 2005, 08:12 PM   #26
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Ok, thanks Tobias, I will do that.
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Old 28th September 2005, 08:13 PM   #27
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There are lot's of good opamps but it's also a matter of getting them.

OPA134 is a "Volvo S80 with all the extras" and can be bought at www.elfa.se
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Old 28th September 2005, 08:56 PM   #28
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Right, , the 627 was quiet a bit too expensive for my budget, , so I guess I settle with the 134.
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Old 28th September 2005, 10:07 PM   #29
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Or a SOIC->DIP adapter

Something like this: http://pcbdesign.se/
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Old 28th September 2005, 11:03 PM   #30
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Alright, but I think I'll stay with the larger version, kind of tiny those surface mounted chips.

Either way, here's todays version of the PCB, comments are welcome as usual.
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