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Old 29th January 2013, 06:25 PM   #1331
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Quote:
Originally Posted by FdW View Post
PLEASE NOTE: This information is for the primary/mains-side of the device!

WARNING: BE VERRY CAREFULL WHEN WORKING ON MAINS CONNECTED CIRCUITS, ALWAIS UNPLUG FIRST!

The ‘Paradise’ system is using about 150mAac per supply, as there are 4 supply's this will be a total current of 600mAac.

When U are using a 28Vac transformer then this will work out at 600mAac * 28Vac = 17Watt, to this we allow some transformer losses and make it a nice 20Watts.

This 20Watts translates to (about) 100mA@220Vac or 200mA@110Vac.

Next what you need to do is find the transformer specifications; it will (most probably) specify a maximum primary current (that may be sustained indefinitely). The fuse you need to select has a value between 100mA@220Vac(200mA@110Vac) slow blow and the transformer specified maximum (also slow blow).

Practically, I would select a fuse 2 * the calculated value, that is 200mA@220Vac(400mA@110Vac), but it has to be below the maximum that is specified for the transformer.

All wiring on the primary/mains side of the system should be able to carry at the least this current, but preferably 5 times it (that is 1A@220Vac(2A@110Vac)).

These (above) are my 'ballpark'-guidelines this should be sufficient for any home audio appliance.

See also: http://www.optifuse.com/PDFs/FuseSel...Guide_RevA.pdf
Thank you as well. I have never heard an explanation on how to determine the value. I always put it slightly below the total bias of the circuit.
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Old 30th January 2013, 02:34 PM   #1333
Marra is offline Marra  United Kingdom
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My unboxed Paradise Which is sounding very very good.
Time to buy some cases.

Click the image to open in full size.
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Old 30th January 2013, 02:39 PM   #1334
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Great, one more successful build.
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Old 30th January 2013, 03:35 PM   #1335
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Originally Posted by jj506 View Post
after I reduce R43a/R43b to 9.1K then the offset was stable in between +/-20mV (change to 3.9K could down to +/-5mV)
Regards,
jj
Do i have to expect influence to the soundperformance of the Paradise when i reduce R43a/b ?
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Old 30th January 2013, 03:58 PM   #1336
brianco is offline brianco  Ireland
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My unboxed Paradise Which is sounding very very good.
Time to buy some cases.

Well done Marra; which cartridge & arm do you use?
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Old 30th January 2013, 04:04 PM   #1337
Marra is offline Marra  United Kingdom
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Currently using an SME4 with a Denon DL-S1.
Regarding R43a/b they are the 150k's ?

Last edited by Marra; 30th January 2013 at 04:06 PM.
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Old 30th January 2013, 04:25 PM   #1338
FdW is online now FdW  Netherlands
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My unboxed Paradise Which is sounding very very good.
Cool
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Old 30th January 2013, 07:00 PM   #1339
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by Doppelkopf View Post
Do i have to expect influence to the soundperformance of the Paradise when i reduce R43a/b ?
Quote:
Originally Posted by Marra View Post
Currently using an SME4 with a Denon DL-S1.
Regarding R43a/b they are the 150k's ?
Interesting point on the 150k resistors.
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Old 31st January 2013, 08:54 AM   #1340
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Originally Posted by hesener View Post
Good news, at least from a DC point of view you are up and running...

The circuit node where the RIAA caps go is very high impedance, there should be very little capacitance there. Thats strange.....
Thats realy strange but I resolder the 10nF (measured 9,94nF) and the 1nF (measured 1048pF). And made a soundcheck again.
Hmm, good, but not perfect. There is still a hiss in voices or more a lisp.
I use a Benz mirco MC silver with 2,0mV output. Is this system useful?
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