F5X -- the EUVL Approach - The Build Thread - Page 37 - diyAudio
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Old 16th January 2013, 02:40 AM   #361
EUVL is offline EUVL  Europe
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I did not feel criticized, just tried to explain why it is so.
Thanks for organising.


Patrick
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Old 19th January 2013, 01:25 PM   #362
NicMac is offline NicMac  Italy
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Default second channel under intensive care


6 DMM's would be nice
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Old 19th January 2013, 05:51 PM   #363
EUVL is offline EUVL  Europe
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I see you are enjoying yourself.




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Old 19th January 2013, 07:18 PM   #364
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by EUVL View Post
I see you are enjoying yourself.




Patrick
Of course

And tonight high-power fun with the PSU and my new-build 4 x 100W 4R dummy load

I may now have to lear to use my PicoScope
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Old 19th January 2013, 07:41 PM   #365
EUVL is offline EUVL  Europe
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My dummy load.
No heat sink required.

Patrick
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Old 19th January 2013, 08:09 PM   #366
NicMac is offline NicMac  Italy
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Without the heat-sink my dummy load would exceed the 200˚C rating of the aluminum clad resistors. With the sink I can however handle all 4 supply lines contemporarily and.......

it works a charm!

MS22 75004 thermistor and 3.15A slow-blow fuse. All OK.
5 mV ripple P2P (the scope say 100Hz! Why I thought I was living in a 50Hz country).
Rectification and caps does not generate much heat. The R's in the CRC get very warm, but nothing to worry about.

I have 15V over the load, but I expected a bit more. I hope it is sufficient also for the regulated supplies.
The transformers are not the ones from the GB. I got these from Canterbury windings and they were ordered before Patrick's increased the voltage specification. These have 15V/18A secondaries.

One happy builder

Nic

P.S. what is the easiest way to get traces from the PicoScope software to this forum?
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Old 19th January 2013, 09:57 PM   #367
Horio is offline Horio  United States
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Here is my 3-point matching rig, for measuring the JFET's.

Click the image to open in full size.

I attached it to a heatsink I had laying around so it wouldn't move all over the place while I am matching the parts.

Last edited by Horio; 19th January 2013 at 10:27 PM.
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Old 19th January 2013, 11:08 PM   #368
NicMac is offline NicMac  Italy
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Alexis,
the control PCB is between me and music so I kindly ask for your help in explaining the interface. I do have your schematics, but this is not entirely helpful as there are no pointers towards the amp schematics. To make it easy for you I have below listed the connections I would like you to indicate. Layman terms like "cathode side of left channel speaker relay", would be greatly appreciated. I am sure that several others would appreciate this information. Also a picture of the recommended jumpers for a default F5X would be greatly appreciated.
Cheers,
Nic


PCB left hand side:
LSP1/SENSE1
1: ??
2: ??
3: ??
4: ??
RSR2/ISR2
1: ??
2: ??
3: ??
4: ??
MR/TRP RST
1: ??
2: ??
3: ??
4: ??

PCB right hand side
SENSE2/LSP2
1: ??
2: ??
3: ??
4: ??
ISR1/RSR1
1: ??
2: ??
3: ??
4: ??
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Old 20th January 2013, 02:33 AM   #369
EUVL is offline EUVL  Europe
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> 5 mV ripple P2P (the scope say 100Hz! Why I thought I was living in a 50Hz country).

Draw a rectified waveform and count the ripples.
Or do a simulation with LTSpice.

> Rectification and caps does not generate much heat.
> The R's in the CRC get very warm, but nothing to worry about.

As they should.

> I have 15V over the load, but I expected a bit more.
> I hope it is sufficient also for the regulated supplies.

No real concern.
The regulator still regulates as a cap multiplier even under 16V.

> P.S. what is the easiest way to get traces from the PicoScope software to this forum?

Screen shot.


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Old 20th January 2013, 09:46 AM   #370
ashaw is offline ashaw  Australia
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Here is a connection set that is equivalent to EUVL's original Schematics.
LSP1/LSP2/ISR1/ISR2:
OFF - ON
SBY - OFF
SUD - ON
TRP - ON
RSR1/RSR2:
OFF - OFF
SBY - ON
SUD - ON
TRP - ON

Attached is a connection diagram put wire straps where the red lines are.
The connectors that this board is designed to use, if you mant them are 4 way Molex Microblade connectors.

Note:This Board has 24V relay outputs, If you want to use 12V relays as per EUVL for the protection shorts, you must wire them in series off board.
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Last edited by ashaw; 20th January 2013 at 09:49 AM.
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