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Dynamic Processors / Re: CLX-VU Build Thread (DBX 160VU ) UPDATE: REV 3
« Last post by BerndVP on Today at 02:23:54 PM »
yes, it's correctly wired.
But I'm reading strange power values if I trace it...

I think I got the 4:1 working, got the 10db change when switching from -30db to -20db
As per the calibration instruction listed here.
Did you check your led's for correct wiring? Take a look at the original schematic they show how they are wired.
Connecting the anode, and cathodes correctly.
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The Chamber / Re: Polycarbonate Film Caps
« Last post by abbey road d enfer on Today at 02:15:24 PM »
8)

Ok, some more info on the application, here's the schematic for the compressor I'm planning to build;


All caps 400V rated

C1.. 1uF
C2, C3, C5..0,1uF
C6.. 0.01uF

I usually just grab what I have, but I wonder, if you did not have any stock and you would need to source these caps, what would you use in this schematic ?

I do have some MKC for all these positions, but now I'm just curious and I think it's an interesting subject.
C1, C2 & C3 are those that matter the most. C5 is not critical, C6 even less.
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Preamplifiers / Re: Neve style 500 series mic pre 1290 1073
« Last post by Cdp on Today at 02:01:58 PM »
@Nielsk, I don't know about the cost to ship to the US, I may find time to look at this but I'm a bit in a hurry at work this week.
I think we have to find some more people if we want to do that. Looking to the price, I don't know if I want that or maybe wait a few weeks and see if they became available again from AML or other seller, for a reasonable price
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No worries. It's a plan to have them on stock :)

Ohh, good news!👍
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The Chamber / Re: Polycarbonate Film Caps
« Last post by PermO on Today at 01:58:43 PM »
 8)

Ok, some more info on the application, here's the schematic for the compressor I'm planning to build;


All caps 400V rated

C1.. 1uF
C2, C3, C5..0,1uF
C6.. 0.01uF

I usually just grab what I have, but I wonder, if you did not have any stock and you would need to source these caps, what would you use in this schematic ?

I do have some MKC for all these positions, but now I'm just curious and I think it's an interesting subject.
 
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Well from what little info I have to go on these I've found out the following

For an inch square core, using 0.35mm with approx 1800 turns and a crate paper gap in core it's meant to give 300ma, 3H and be 46ohms.

It's a starting point I suppose.
I'll experiment and see what I can get on this core with what I've got as I think I have some 0.35mm
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Drawing Board / Re: 1KHz 0dBu pocket generator
« Last post by Rob Flinn on Today at 01:55:10 PM »
Hi Ian,

A quick question.   Is there any reason in particular that a TL072 is specified ?   Power consumption perhaps ?  I was thinking that if one used a 5532 then the box would have a bit more drive capabilty ?
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The Lab / Re: Neumann PsvB schematic/infos request
« Last post by thekid777 on Today at 01:48:47 PM »
Understood!
I'm looking for schematic to repair my unit and pinout as well
+ some data if there's any about hook up in the console
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Brewery / Re: I don’t think this guy is married...
« Last post by Tubetec on Today at 01:48:26 PM »
There was a few guys in my years of hifi sales returned with their tail between their legs , they either got their money back on the gear or their marriage was over , on the few ocassions it happened we did accept the return of the gear or sell them something more 'spouse friendly'  as we used say ourselves in the trade .

The Bose style sat/woofer set up was the usual road for guys who were downtrodden by the wife   :(

 
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The Chamber / Re: Polycarbonate Film Caps
« Last post by rackmonkey on Today at 01:42:18 PM »
I got it off track by mentioning that I like PC in filters, I think. It just happens to be where the differences can be heard most clearly. But the intent was to inform of an opinion that the OP could take or leave where coupling caps are concerned.

Very nice summary above, Abby. The dumbed-down line on coupling caps has long been "there's no voltage across the cap, so its affect on audio will be negligible." But the part usually left off that line is, "...provided the cap is sufficiently large." As anyone who's ever replaced 100nF or 2.2uF coupling caps with a same-value cap of different dielectric material in, say, a tube preamp knows, the cap construction has an effect on audio. Those old metallized paper in oil caps have a sound of their own.

To John's response above, yes, DA, DF and tempco in polycarbonate caps is significantly worse than PP or PS. But it's considerably better than polyester. If lowest distortion is the goal, then obviously use the parts with better numbers there - no argument. But I think the OPs question is more along the lines of subjective qualities, which to my ears PC is pleasing. People love the 1073's EQ, but Neve often used Mullard mustard caps in those, which are just polyester film/foil. A no-no on paper (polyester caps are not recommended for filters by any manufacturers guidance that I've seen), but subjectively something attractive to a lot of people over the years.

So you can use traditionally specced smaller values for coupling caps and use the objectively best measuring caps for lowest distortion in that situation; you can use caps for their flaws and the audio effects they impart; or you can just use sufficiently large electrolytics for coupling and not worry about it. It's all about goals.
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