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FdW

FdW

Member
Joined 2009
brozatus said:
Hello,

I'm very happy with my paradise.

I've found no suggestions about the size/value of the fuse at the mains input.
I have a holder for 2 fuses there for both, + and -.

For testing I have two 2 amp. fuses in there, which are surely not the right value.

Best regards,
Christoph
Click to expand...

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/FuseSelectionGuide_RevA.pdf
 
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M

miepa

Member
Joined 2012
SMD cap, footprint 1206

Guys,
the SMD caps, footprint 1206 - C901, C901_1, C901_2, C902, C902_1, C902_2, C903, C903_1, C903_2

CAPS are available in FILM or CERAMIC - which one would be the better choice in the paradise

what are they for - are they really important??? because the manual says: THESE CAPS ARE OPTIONAL
 
H

hesener

Member
Joined 2005
Paid Member
miepa said:
Guys,
the SMD caps, footprint 1206 - C901, C901_1, C901_2, C902, C902_1, C902_2, C903, C903_1, C903_2

CAPS are available in FILM or CERAMIC - which one would be the better choice in the paradise

what are they for - are they really important??? because the manual says: THESE CAPS ARE OPTIONAL
Click to expand...

Please put ceramic caps. They are helpful in avoiding oscillations in the current mirrors, so if you do not have oscillations you can happily leave them out. As a safety measure, it doesnt hurt to put them in....
 
buzzforb

buzzforb

Member
Joined 2010
FdW said:
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/FuseSelectionGuide_RevA.pdf
Click to expand...

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.
 
FdW

FdW

Member
Joined 2009
Just trying to help :) thanks (both)

These are the most important/relevant messages regarding PSU and Pre-Reg.
  1. Mpp #4375 PSU-pre-regulator.
  2. Mpp #4610 V2 Schemas UPS and Amp.
  3. Mpp #6506 CCS fine-tuning.
  4. Mpp #6462 PSU with my notes.
  5. Mpp #6809 Do not try to feed the CVS of the CCS of the shunt with a regulated power supply.
  6. Mpp #7127 More about transformer selection.
  7. Mpp #7635 Single and dual transformer wiring (also corrected drawing) (See also #7733).
  8. Mpp #7733 Grounding (PSU, RIAA and Player).
  9. Mpp #7810 35V PSU for the CroMagnon.
  10. Mpp #7830 The PSU explained.
  11. PradiseBuilders #13 Schema's and assembly guide.
  12. PradiseBuilders #155 Vdc input voltage minimum simulated.
  13. PradiseBuilders #970 PSU oscillates; posible solutions?
  14. PradiseBuilders #983 Compensating the PSU for oscillations.
  15. PradiseBuilders #1130 Updated 'Paradise R3 assembly guide'.
  16. PradiseBuilders #1173 Fixing oscillations (up to #1182).
  17. PradiseBuilders #1322 Fuse :).
Have a look at these and their following messages.
 
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M

Marra

Member
Joined 2009
Paid Member
My unboxed Paradise Which is sounding very very good.
Time to buy some cases.

GEDC0832.jpg
 
L

Libby123

Member
Joined 2012
hesener said:
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.....
Click to expand...

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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