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Chipomatic balanced input RIAA
Chipomatic balanced input RIAA
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Old 19th January 2019, 11:06 AM   #71
EUVL is offline EUVL  Europe
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MKP2 5% can be had from Mouser (expensive) or Buerklin (limited values).
In any case one should always measure and trim with LCR, even for 5%.

The dissipation factor of ECHU is well under 0.1% in the audio band :
https://cdn-reichelt.de/documents/da...ECHU_SERIE.pdf
(See figures in P.3)
At 1kHz it is essentially zero.



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Old 19th January 2019, 11:51 AM   #72
Salas is online now Salas  Greece
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Got to measure some samples then since they look promising. As to why they state equal to or smaller than 0.6% at 1kHz in a short datasheet (the Sep 2017 one without graphs linked in Mouser that I read when I was searching) as well as they state the same in the spec headlines of the expanded one you linked here, I would not guess.
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Old 19th January 2019, 12:02 PM   #73
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Quote:
Originally Posted by EUVL View Post
The dissipation factor of ECHU is well under 0.1% in the audio band :
https://cdn-reichelt.de/documents/da...ECHU_SERIE.pdf
(See figures in P.3)
At 1kHz it is essentially zero.
PPS capacitors are my first choice for RIAA networks and line-level. But I have made some bad experiences when soldering these caps (ECHU, SMD) by hand. They quickly began to melt and changed their capacitance. Now I use leaded Kemet SMR Series, available in 5% at Mouser.


Boris
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Old 19th January 2019, 12:35 PM   #74
EUVL is offline EUVL  Europe
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We have measurements in an oscillator circuit.
They were -140dB whereas WIMA FKP2 was -160dB.
You can argue 10x worse. But -140dB is just fine for me.

They are, like all SMD film caps, fragile.
You need to lower iron temperature to 300C and use fine (0.3mm) leaded solder.
Then temperature is not so high, and also not so much heat energy applied.
Desoldering requires 2 irons. And you need to discard afterwards.
But otherwise we used them a lot without problems.
All JFET open-loop RIAA pre-amp


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Old 19th January 2019, 01:38 PM   #75
Salas is online now Salas  Greece
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Chipomatic balanced input RIAA
Some sense of scale...
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Old 20th January 2019, 07:16 PM   #76
Salas is online now Salas  Greece
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Chipomatic balanced input RIAA
Quote:
Originally Posted by Dimdim View Post
One populated PCB:

Click the image to open in full size.

Power-up was uneventful, no magic smoke in sight.

Power draw was ~18mA / rail / channel.

Proper testing will be done tomorrow..
There's a layout bug to fix before you do some testing with signal. R6 must be moved between R5's left side and RN1's ground side, else you will get unity gain from IC2 instead of 10X. George called to ask why no gain from stage two and we debugged it over the phone.
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Old 20th January 2019, 07:25 PM   #77
Salas is online now Salas  Greece
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Here's how the bodge is to be done (not too bad in the end as it includes even less loop area)
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Old 20th January 2019, 10:08 PM   #78
Dimdim is offline Dimdim  Greece
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Chipomatic balanced input RIAA
I see it now. My bad, going from your (correct) schematic to my (Eagle's) schematic.

Funny enough, I was looking at my Eagle's schematic the other day when I was ordering the components and that part of it looked a bit odd, but I didn't pay much attention. It appears that I should have.
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Old 21st January 2019, 04:54 AM   #79
Salas is online now Salas  Greece
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Its those Eagle boxes don't look like electronic op-amp symbols so it did not stick out. Anyways, its a cute little bodge. Any prototype needs one for good luck.
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Old 21st January 2019, 10:13 AM   #80
EUVL is offline EUVL  Europe
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> Any prototype needs one bodge for good luck.

This is a good one.
I'll also use that in the future.


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