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Old 24th April 2008, 10:37 PM   #11
OXAUDIO is offline OXAUDIO  United Kingdom
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Quote:
Originally posted by x-pro


Hi,

I've emailed you through the forum and on reply will send you the diagrams. Most likely the LED2 itself is at fault - just replace it first with a good quality green LED, lifting it at least 15 mm of the PCB. Mind the polarity! If it is the transistor (also possible, thought less likely) the correct type is ZVP3306A from Zetex, available from Farnell:

http://uk.farnell.com/9524851/semico...ZETEX-ZVP3306A



In 1996 I was working for Creek Audio and Michael was my boss . That does not change the fact that I've designed all electronics in that amp, including the PCB layout.

Cheers

Alex
I have now completed the repair to the A3i. LED2 was indeed faulty, and, having replaced it(with an orange LED incidentally- I didn't have any suitable green ones to hand), set the bias so that there is ca -1.2v at the collector of Q10, then test run the amp., first with no signal applied, for maybe 30 to 40 minutes, then for 2 or 3 hours continuously playing music of various types and at varoius volume settings, without any further problems.
Forgive my possible ignorance, but does the LED HAVE to be green? The orange one seems, so far, to be OK.
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Old 24th April 2008, 10:58 PM   #12
x-pro is offline x-pro  United Kingdom
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Quote:
Originally posted by homemodder
Hi X-pro

I would like to ask if you have spice models on the mosfets(zvp3306 or zvp3310). I tried using the models from zetex but they dont seem to work with lt spice.
Sorry, no, I don't have these models.


Quote:
Originally posted by OXAUDIO
Forgive my possible ignorance, but does the LED HAVE to be green? The orange one seems, so far, to be OK.
Good to know that the amp works. Green colour is important only because of the voltage drop on the LED. For green it is about 2V. On an orange LED the drop could be a bit less. Measure the difference - if it is only 100-150 mV than you probably can get away with this.

Cheers

Alex
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Old 25th April 2008, 10:29 AM   #13
OXAUDIO is offline OXAUDIO  United Kingdom
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Thanks, Alex. Voltage is within those limits so far, but I'll get a few green LEDs just in case...
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Old 2nd May 2009, 05:47 PM   #14
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Talking cambridge audio A3i amp

Hi x-pro , very nice to read your post in forum . i am new ,so i can not email you in forum . could please send me full schematic to my email
eddyvu@hotmail.com . Thx.
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Old 2nd May 2009, 06:08 PM   #15
x-pro is offline x-pro  United Kingdom
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Default Re: cambridge audio A3i amp

Quote:
Originally posted by xeddyvux
Hi x-pro , very nice to read your post in forum . i am new ,so i can not email you in forum . could please send me full schematic to my email
Done.

Alex
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Old 19th April 2010, 10:53 PM   #16
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merciiiiiiiiiiiii
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Old 20th August 2011, 01:14 PM   #17
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Hello X-Pro,

I have a cambridge Audio 3i which is genrating a lot of backgrounfd noise and wanted to know which potiential components would cause this to occur, can you plese send me a schematic of the amplifier as well. Thank you!
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