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Old 18th May 2003, 09:32 AM   #1
Eccu is offline Eccu  Finland
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Question Crescendo protection circuit?

Still my other channel of Crescendo amplifier won't work.
damn !§$#

I have located that failure is on other protection circuit, but I do not know exactly where it is.

I add one picture.

Is that measure right (marked on red color)?
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Old 18th May 2003, 11:04 AM   #2
joensd is offline joensd  Germany
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Hi Eccu,
Iīm measuring 1,075V over the opto-coupler LED so thatīs OK.
What about the bias and DC-offset?
Are those values good enough to not turn on the protection circuitry?

Cheers
Jens

Hope to some pics of your chassis soon!
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Old 18th May 2003, 06:07 PM   #3
Eccu is offline Eccu  Finland
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Thanks Joensd again...

The problem is just this.... I don't get that 1VDC on that problematic channel.

I have two diode bridges like in attachment.
On channel which work, I take that 35 VAC to protection circuit from other diode bridge and to other channel which not work, I take that AC from other diode bridge.

:w rench:
All wirings are OK.
I have measured all resistors and diodes which are enclosed CNY17 optocoupler.
I have changed those CNY17 optocouplers from other channel to another.
Zero stage is OK too.


Now I feel that I'm electronic dumbass.
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Old 18th May 2003, 06:29 PM   #4
Rudy is offline Rudy  Belgium
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are both fase of the transformer connected like you need to if you would use 1 bridge, both fases at the diodes ( protectioncircuit thow ) should be 180° twisted.

There is now problem using 2 bridges but you should use same wiring as using 1.

If you dont want to change the wiring use a bigger elco for C9, but the shutdown will also be a little delayed witch is not so good after all.

Greetz Rudy
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Old 18th May 2003, 06:44 PM   #5
joensd is offline joensd  Germany
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Quote:
are both fase of the transformer connected like you need to if you would use 1 bridge, both fases at the diodes ( protectioncircuit thow ) should be 180° twisted.

There is now problem using 2 bridges but you should use same wiring as using 1.

If you dont want to change the wiring use a bigger elco for C9, but the shutdown will also be a little delayed witch is not so good after all.

Greetz Rudy
Eccu, Rudy is right.
With two bridges itīs tricky to connect it all up like Elektor intended to (using one bridge).
But as your first channel works it canīt all be that wrong.
How exactly did you wire the prot-PCB?
Wiring diagram would be handy.

Cheers
Jens - thinks Beavis is a dumbass
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Old 18th May 2003, 07:00 PM   #6
Eccu is offline Eccu  Finland
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Sorry.... now I dont understand what fase means... Do you mean phase?

At the moment I don't have wiring diagram from my system.

I try that twisting tomorrow
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Old 18th May 2003, 07:07 PM   #7
Eccu is offline Eccu  Finland
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It's quite miracle that I get that other channel to work with first run


Very big thanks to both of you!


I hope that "twisting" helps


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Old 19th May 2003, 05:03 PM   #8
Rudy is offline Rudy  Belgium
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jup i mean phase, fase is dutch for phase , silly me

greetz Rudy
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Old 19th May 2003, 05:39 PM   #9
joensd is offline joensd  Germany
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Quote:
It's quite miracle that I get that other channel to work with first run


Very big thanks to both of you!


I hope that "twisting" helps
No prob and gratulation!
But.. where are the pics god damn it...

Cheers
Jens
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Old 19th May 2003, 08:54 PM   #10
Eccu is offline Eccu  Finland
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I will post some pictures when amp is ready!!!!

Anyway..... Here is one picture from my old house. (No Crescendo)

You can see my first amplifier on lowest self.
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Old 20th May 2003, 04:12 AM   #11
Diode is offline Diode  United States
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Nice speakers....

Are they SEAS drivers? I built their big brothers in the D'Appolito arrangement with SEAS drivers. I love them!!!!

Chris
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Old 20th May 2003, 06:10 AM   #12
Eccu is offline Eccu  Finland
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Yes, Seas drivers. Those are DIY and about 4 years old. Somekind copy of Jamo Concert 8.

I like those speakers too, but x-over is still under modification because upper-freqs are little too "powerful". Or then I have too hard furnishing.
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Old 20th May 2003, 02:47 PM   #13
Eccu is offline Eccu  Finland
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Hello... I try (twist) swap those AC wires which goes to protection circuit, but it won't help nothing

But then I disconnect those AC wires from other diode bridge (which goes to good (working) protection circuit) and I connect those AC wires from bad (not working) protection circuit to that diode bridge and IT WORKS!

But I still not know why that won't work with that other diode bridge.

Both secondary windings are OK.
I measure both AC connections (from both diode bridges) to protection circuit and I get about 41VAC. Both works OK.

Do I miss something?


Is there any disadvantages if I connect both protection circuit to same diode bridge (same secondary winding)?
Will this effect somehow to other rail voltage because those AC wires are connected to diodes in protection circuit and other rail does not have this same kind connection?


But anyway.... now that fail reason clarified
Thanks to all on this thread!
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Old 20th May 2003, 03:36 PM   #14
joensd is offline joensd  Germany
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Quote:
Is there any disadvantages if I connect both protection circuit to same diode bridge (same secondary winding)?
You connected one secondary winding to the protection PCB?
Sorry, I still canīt get your connections.
Where did you connect the two AC and the ground connectors from PCB according to the schematic above?

Cheers
Jens
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Old 20th May 2003, 05:11 PM   #15
Rudy is offline Rudy  Belgium
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... lets try this again, from the beginning

what we tried to explain is that you needed to switch wire 3-4 sow that after you switched them that you could wire 5 and 6 to the protection circuit. This makes no difference for the amp itself but for the protection it does.

i am not saying that you cant use the other bridge for the AC chenking off the protection, but isn't what we all want 2 totally seperated mono amps ...

i hope its little cleared out now
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