F5X -- the EUVL Approach - The Build Thread

[EUVL]

I did not feel criticized, just tried to explain why it is so.
Thanks for organising.


Patrick

[NicMac]

6 DMM's would be nice

[EUVL]

I see you are enjoying yourself.




Patrick

[NicMac]

Originally Posted by EUVL

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

[EUVL]

My dummy load.
No heat sink required.

Patrick

[NicMac]

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?

[Horio]

Here is my 3-point matching rig, for measuring the JFET's.



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.

[NicMac]

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: ??

[EUVL]

> 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.


Patrick

[ashaw]

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.