John Curl's Blowtorch preamplifier part II - Page 3814 - diyAudio
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Old 14th April 2013, 02:02 PM   #38131
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Quote:
Originally Posted by qusp View Post
thanks for the link, I like the smaller sot23 package of the maxim. Vishay make some excellent matched networks as well, if you have the coin, the vishay precision group make some$$ but the standard soic8 package thin film parts (available in several formats including ladder and isolated) are very good.
Link? Looking for 1K isolated
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Old 14th April 2013, 02:34 PM   #38132
qusp is offline qusp  Australia
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funnily its the exact part and value I bought to try out. Vishay ORN 1kΩ isolated thin film. as I understand it the global value match is 0.1%, but they are trimmed to each other for TCR to a higher level. there is a soic16 8 resistor part as well

the VPG Zfoil part is SMNZ, but not much stock at DK, that one is a 10k/10k 10k/10k part. you can get them in quad isolated of the same value, or in pairs, for example 500Ω/1kΩ 500Ω/1kΩ. they dont stock those values or a 1kΩ at DK, but you can order from texas components. TC outsource from VPG for this part, rather than making them and no naked options but you can order just 1 of whatever values you like, unlike from Vishay. they do a leadless package as well I believe, cant remember the part # offhand
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Old 14th April 2013, 02:51 PM   #38133
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PMA, can't we look inside your 'passive preamp'? Is it filled up for some reason? I would not want to imply that you did something less optimal than possible, but I can't say, one way or another. Your 'active preamp' appears to be full of quality parts, some very difficult to obtain, these days. Sort of like what Charles Hansen, Nelson Pass and I do so often.
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Old 14th April 2013, 03:23 PM   #38134
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Quote:
Originally Posted by qusp View Post
funnily its the exact part and value I bought to try out
NOMCA14031001AT is what I'd like. Heh, group buy? 25 is a nice price break, I'd take 1/3 of that many by myself.
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Old 14th April 2013, 03:34 PM   #38135
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Originally Posted by john curl View Post
PMA, can't we look inside your 'passive preamp'?
Still waiting to hear from you why it takes a four deck switch for something as simple as polarity. Did you miss it the first few times it was asked?

se
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Old 14th April 2013, 03:38 PM   #38136
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Default Obvious...

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Still waiting to hear from you why it takes a four deck switch for something as simple as polarity. Did you miss it the first few times it was asked?

se
Four poles is provision for balanced system polarity switching I expect.

Dan.
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Old 14th April 2013, 03:41 PM   #38137
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Four poles is provision for balanced system polarity switching I expect.
That's poles. I was asking about decks. You can have four poles on a single deck.

se
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Old 14th April 2013, 03:50 PM   #38138
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Originally Posted by magnoman View Post
Although this corner geometry issue is real, I suspect its academic even for high speed digital, especially when compared to other practical issues such as the stubs left when terminating at IC's, vias impedance, matching of impedance between alternate layers etc...

Thanks
-Antonio
But we know that in audio, some things that alter the sound defy common instrumentation, and thus the common way of looking at things.
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Old 14th April 2013, 04:07 PM   #38139
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Default One Switch Fits All...

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That's poles. I was asking about decks. You can have four poles on a single deck.

se
So maybe it's using one pole per deck ?.

Dan.
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Old 14th April 2013, 04:20 PM   #38140
RNMarsh is offline RNMarsh  United States
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[ try- signal isolation and crosstalk ]
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