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Old 6th March 2019, 11:38 PM   #41
Hearinspace is offline Hearinspace  Canada
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noDAC DHT output stage
Thanks !
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Old 7th March 2019, 10:55 AM   #42
merlin el mago is offline merlin el mago  Europe
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You're welcome.

@ abraxalito
Done the filter yesterday and enjoyed all the evening & night listening music, a big thanks again.

About step up transformers I guess I need 1:1.27 my calculations:

0.56Vrms = 1.58Vpp
0.71Vrms = 2Vpp

So I need to increase 0.15Vrms to reach the 2Vpp, it's OK.

Also I need an OPT with primary impedance of 50 Ohm & a secondary of 63.5 Ohm

Are my calculations OK?
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Old 15th March 2019, 10:06 PM   #43
merlin el mago is offline merlin el mago  Europe
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Nobody?
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Old 15th March 2019, 11:17 PM   #44
Tjj226 is offline Tjj226
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Quote:
Originally Posted by merlin el mago View Post
You're welcome.

@ abraxalito
Done the filter yesterday and enjoyed all the evening & night listening music, a big thanks again.

About step up transformers I guess I need 1:1.27 my calculations:

0.56Vrms = 1.58Vpp
0.71Vrms = 2Vpp

So I need to increase 0.15Vrms to reach the 2Vpp, it's OK.

Also I need an OPT with primary impedance of 50 Ohm & a secondary of 63.5 Ohm

Are my calculations OK?
Are you sure you want 2vpp? Most digital signal sources are 2v RMS.

I would just go with a plain old 1:2 step up transformer. That would give you 1v rms out.
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Old 15th March 2019, 11:53 PM   #45
merlin el mago is offline merlin el mago  Europe
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I'm sorry yes for 2Vrms, so I will need 1:4 ratio, primary 50 ohms & secondary 200 ohms, that's?

Last edited by merlin el mago; 15th March 2019 at 11:57 PM.
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Old 16th March 2019, 12:33 AM   #46
kokoriantz is offline kokoriantz  Lebanon
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The impedance ratio is the square of the transformer's winding ratio . Most ready made transformers for audio are 600 ohms . What you need is 600:10k . See on Aliexpress .
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Old 16th March 2019, 11:25 AM   #47
merlin el mago is offline merlin el mago  Europe
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Quote:
Originally Posted by kokoriantz View Post
The impedance ratio is the square of the transformer's winding ratio . Most ready made transformers for audio are 600 ohms . What you need is 600:10k . See on Aliexpress .
Yes I forgot thanks, I need a primary impedance of 50 ohms because is the output impedance of Amanero and the input/output impedance of the 4th order low pass filter so I need a custom made OPT 50:833 ohms 1:16 ratio?

What have I to look for: Line input transformer or Step-up MC transformer?

Last edited by merlin el mago; 16th March 2019 at 11:31 AM.
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