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Old 3rd April 2013, 10:24 AM   #8741
Joachim Gerhard is offline Joachim Gerhard  Germany
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What i can do is use my ESS board, put in a CD in my drive with test tones and look what is the outcome. That would measure the whole chain.
So curryman, how does your implementation sound ?
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Old 3rd April 2013, 11:19 AM   #8742
Joachim Gerhard is offline Joachim Gerhard  Germany
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I found one buffer-filter on a separate board so i can measure it now in isolation.
It has the coils on board though.
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Old 3rd April 2013, 10:37 PM   #8743
Joachim Gerhard is offline Joachim Gerhard  Germany
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Here are the measurements of the JG Filter-Buffer.
The maesurements are done at 4V P-P.
The first measurement is done with the coil jumpered. I wanted to find out if the coil adds distortion. That is obviuosly not the case at this level the second measurement shows where i measured the other channel that has the coil in the signal chain.
This buffer has another character then the B1, less second, more third.
On the other hand reducing the 4V P-P by 3dB ( third picture ) the distortion is so low that i reach my maesureemnt limit. It is cetainly of a monotonic character.
Attached Images
File Type: jpg JG Buffer 2.JPG (226.5 KB, 214 views)
File Type: jpg JG Buffer-Filter 2.JPG (231.1 KB, 208 views)
File Type: jpg JG Buffer-Filter 2 -3dB.JPG (226.8 KB, 195 views)
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Old 3rd April 2013, 11:14 PM   #8744
Joachim Gerhard is offline Joachim Gerhard  Germany
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Actually when i compare the JG Buffer to the B1 it does have aprox. the same amount of 3rd but much less second so it cancels the second.
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Old 4th April 2013, 09:59 AM   #8745
curryman is offline curryman  Germany
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Thank you very much Joachim! How did you power the Buffer for your measurements?

Quote:
Originally Posted by Joachim Gerhard View Post
So curryman, how does your implementation sound ?
As mentioned in this post I really like the sound. With a +/-15V supply and a higher impedance headphone (100Ohm and 9V are a bit tough for the buffer ) I liked it even more. I am currently about to finalize the second version of the board. Maybe we can listen to it together at the Frickelfest
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Old 4th April 2013, 01:08 PM   #8746
Joachim Gerhard is offline Joachim Gerhard  Germany
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I uses fresh NiHybrid cells. They had a voltage of some more then 10V each.
Driving the buffer with + - 15V will reduce the distortion a bit.
I loaded the buffer with 10kOhm and drove it with 50 Ohm.
If more juice is needed the buffer can be "pimped " with two aditional transistors.
Calvin has shown varieties on the " Simple Buffer Ideas " thread.
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Old 4th April 2013, 01:09 PM   #8747
Joachim Gerhard is offline Joachim Gerhard  Germany
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Sure, lets do a listening at FF.
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Old 5th April 2013, 07:11 PM   #8748
FdW is offline FdW  Netherlands
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It’s alive! It’s alive! It’s alive! It’s alive! It’s alive! It’s alive! It’s alive! And It’s good!
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Old 5th April 2013, 07:23 PM   #8749
FdW is offline FdW  Netherlands
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Marianne produced some tears.
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Old 5th April 2013, 08:12 PM   #8750
FdW is offline FdW  Netherlands
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It's amazing!
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