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Old 11th January 2013, 02:36 PM   #1051
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by Bksabath View Post
Hi Riccardo
is been a long time since
Would you mind reposting the values you calculated for the RIAA
my thinking is that if I I need to aproximate the values I rather verge to the one you calculated than the opposite way
Here you have:

11nF, 32,1nF 9.9K and 73.7K
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Old 11th January 2013, 02:56 PM   #1052
RCruz is offline RCruz  Switzerland
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Originally Posted by Bksabath View Post
Tanks Frans quite right that is proper name for Virtinis and actualy probably the best of that pick
How canI use it ?

Where can I get an help file ?
Ca I connect probes to the pc ?
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Old 11th January 2013, 03:08 PM   #1053
hesener is offline hesener  Germany
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Originally Posted by sq225917 View Post
+420mv and +1.5v Ouch.
looks like you have a huge imbalance somewhere. could you check the voltages across the emitter resistors of the input stage, to check if all transistors carry the same current?
this voltage should be below 200mV each (the exact value escapes me but they should be identical....)
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Old 11th January 2013, 03:17 PM   #1054
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Of course I will, back soon
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Old 11th January 2013, 03:58 PM   #1055
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Ok all the emitter resistor are a couple of mv either side of 113mv, the same on both tracks.
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Old 11th January 2013, 04:05 PM   #1056
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However there's no voltage at all across the S-G of the sk170 though there is 12.2v across the zener. On the other tracks theres 2v+ over the S-G and similalrly over the 1k resistor.

Safe to assume that Sk170 is dead?
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Old 11th January 2013, 04:30 PM   #1057
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Originally Posted by RCruz View Post
Here you have:

11nF, 32,1nF 9.9K and 73.7K
Tanks
I must copy this with the best post on the MPP and Paradise treads
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Old 11th January 2013, 04:44 PM   #1058
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Originally Posted by RCruz View Post
How canI use it ?

Where can I get an help file ?
Ca I connect probes to the pc ?
If I remember there is help files on the download from the site but is prety intuitive on how to use.

No need for probes as it uses the sound card from the PC.

For measuring channels ballance is prety good but it can be made much better with a decent sound card I have Audiophile 192 but is prety old and internal (PCI) an external card with decent PSU wuld be less afected by HUM
as my set up doe's with noise floor at 50Hz around -70dB

USB Soundcard for measurement

need help choosing sound card to use with truerta

WinAudioMLS, A Powerful analyzer

The win audio mls is from look of it realy advanced the Demo version that one can have for free is limited but the full program can be had for 160.

I hope this can help you getting started abowe pointers are for ones that do not realy feel the need for oscilloscope so sound card may be worth Having any way...

This last link is for win audio mls they do sell and rent full solutions including sound cards and microphones
Have a look at prices and S.....T in your pants but have a look at prices for students and is a much better story once you have done that cek Ebay they have deals at very low prices altrought most of those are in the german Ebay site.
WinAudioMls: Audio Realtime Analyzer for Windows platform using FFT and MLS
Audio Spektrum Analyzer WinAudioMLS | eBay

I don't know about MAC possibly gogling up same of those sites wuld point you to right place.

What is Mac old mac? far to old 386 stuff

Now seriously
Being MAC it may be a much faster better sistem but normaly one got to pay the price for proffesional gear whic is what MAC is (for best video editing software it leaves any windows based gear standing at the trafic lights)

Last edited by Bksabath; 11th January 2013 at 05:06 PM.
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Old 11th January 2013, 04:47 PM   #1059
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Bksabath View Post
If I remember there is help files on the download from the site but is prety intuitive on how to use.

No need for probes as it uses the sound card from the PC.

For measuring channels ballance is prety good but it can be made much better with a decent sound card I have Audiophile 192 but is prety old and internal (PCI) an external card with decent PSU wuld be less afected by HUM
as my set up doe's with noise floor at 50Hz around -70dB

USB Soundcard for measurement

need help choosing sound card to use with truerta

WinAudioMLS, A Powerful analyzer

The win audio mls is from look of it realy advanced the Demo version that one can have for free is limited but the full program can be had for 160.

I hope this can help you getting started
I kind of remember that Hesener did a design/article (maybe Elector?) for a interface
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Old 11th January 2013, 05:09 PM   #1060
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Originally Posted by FdW View Post
I kind of remember that Hesener did a design/article (maybe Elector?) for a interface
Worth me diggin up same more so link to that be great...

Still my apologies as this is gettin off topic
The idea at begining was to point audiophile to same free (altrought limited) test gear.

So back to topic any comments about my fishing in the dark expedition of earlier on.

What happens if one put a 10 k pot on R3 and R7 and twidle it?
Maybe I shuld ask one question at time I think

Last edited by Bksabath; 11th January 2013 at 05:15 PM.
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