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low pass filter for DSD
low pass filter for DSD
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Old 29th March 2019, 01:04 AM   #171
abraxalito is offline abraxalito  United Kingdom
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Because you're now using a step-up transformer, the primary shunt inductance is going to be lower. So the cap before the trafo should be bigger - I think try 3300uF.
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Old 29th March 2019, 07:14 AM   #172
merlin el mago is offline merlin el mago  Europe
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I don't have on han 3300uF but can parallel several 1000uF to get 3000 or 4000uF, wich one better?

How do you calculate the shunt inductance?
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Old 29th March 2019, 12:12 PM   #173
abraxalito is offline abraxalito  United Kingdom
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I'd go for 3 * 1000uF. Shunt inductance is measured rather than calculated.
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Old 29th March 2019, 12:41 PM   #174
merlin el mago is offline merlin el mago  Europe
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Thank you.
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Old 16th April 2019, 05:00 PM   #175
powerpz is offline powerpz  Bulgaria
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Did somebody else tried low pass LCLC ? I did, but there is a lot of noise, more than signal.. I tried also first schematic R-C --> 3.3k , 1nF again the same ?!
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Old 17th April 2019, 12:51 PM   #176
powerpz is offline powerpz  Bulgaria
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I am wondering if I need to reprogram firmware on Amanero 384 pcb with "DSD only firmware", to use direct connection to pin 3,5 - DSD1 and DSD2, because they are multiplexing with I2S data and clock
Think that merlin el mago can say
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Old 18th April 2019, 08:13 PM   #177
merlin el mago is offline merlin el mago  Europe
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I don't remember exactly the firmware of Amanero but isn't the latest beta. I can tell you because the computer laptop was gone.
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Old 19th April 2019, 11:44 PM   #178
powerpz is offline powerpz  Bulgaria
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Quote:
Originally Posted by merlin el mago View Post
I don't remember exactly the firmware of Amanero but isn't the latest beta. I can tell you because the computer laptop was gone.
you mean that you didn't change the firmware and use as is?
Unfortunately Ive got chinese clone, and it is dead now, amanero flashing utility cannot recognize PID and DID and refuse to program it after erasing
And I didn't expect that I am buying the clone
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Old 20th April 2019, 09:55 AM   #179
merlin el mago is offline merlin el mago  Europe
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No. I changed the firmware only for DSD, I'm using Daphile as player so Linux based.

Try this one:

firmware 2005be & Cpld_for_1081

If doesn't works for you, try this other:

firmware_1099c & cpld_for_1080

If your board is a chinese clon start with firmware 1099c
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Old 14th May 2019, 02:40 PM   #180
merlin el mago is offline merlin el mago  Europe
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@ abraxalito
I want to use the 1:1 OPT for a gain of 6dB (attached pic), could still use your filter without modification?
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