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Old 21st October 2012, 11:49 PM   #521
Reality first!
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Quote:
Originally Posted by dtses View Post
a quick question probably to AndrewT, Dario, linuxguru or other experts here.
what would be the best option to install FE in this rather small box:
I'm sorry but I really don't think, as I've already said, using that small box for both modules it's a good idea.

I suggest you to buy HiFi 2000 1GX288, it costs 30€ and you can fit all things inside it:

Click the image to open in full size.
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Old 22nd October 2012, 08:07 AM   #522
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Quote:
Originally Posted by ClaveFremen View Post
I'm sorry but I really don't think, as I've already said, using that small box for both modules it's a good idea.

I suggest you to buy HiFi 2000 1GX288, it costs 30 and you can fit all things inside it:
I need this rather small enclosure to match my Preamp/ DAC, otherwise I would have gone for a full size one! Anyway, thanks!
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Old 22nd October 2012, 08:58 AM   #523
AndrewT is offline AndrewT  Scotland
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...................Truth is, I taught Andrew everything he knows
Thanks, McBob.

I know nothing, except what I have learned and I am prepared to learn from anybody.
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Old 22nd October 2012, 09:33 AM   #524
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Originally Posted by dtses View Post
I need this rather small enclosure to match my Preamp/ DAC, otherwise I would have gone for a full size one! Anyway, thanks!
If you have access to/can buy a second one you could build monoblocks.

That small box is suitable for a monoblock.
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Old 22nd October 2012, 10:08 AM   #525
bcmbob is offline bcmbob  United States
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Just being silly again Andrew.

I am however, like dtses also doing the squeeze play on a build for the beta boards. The BLAT should be up and running in a few days and has a 7" x 10" footprint. Hope to have a full build thread/blog up by the weekend.
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Old 22nd October 2012, 01:02 PM   #526
Marra is offline Marra  United Kingdom
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I unfortunately seem to be getting nowhere fast.Carefully resoldered all the smd components and fitted a new 3886;cleaned the pcb's and checked for solder links non found so I fired it up through a bulb tester which glowed brightly for a fraction of a second but the led did'nt glow nor the relay click.When I checked voltages there is +-29.3v but across C102/202 I have +14v but only -7.8v.There is no dc offset on the output but 2v on the input which again slowly decreases.Help!
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Old 22nd October 2012, 01:12 PM   #527
bcmbob is offline bcmbob  United States
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I has been my experience if the wattage of the bulb is too high the relay will not activate in some situations. I have three different bulbs that I use. 20 - 40 - 60W.
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Old 22nd October 2012, 01:40 PM   #528
Marra is offline Marra  United Kingdom
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Its a 40 watter Bob and works perfectly with the other board.Confused as to why I have -7.8v when previously before replacing the smd's it was -14.4v or there abouts and there is now no reading across the diode on the relay.
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Old 22nd October 2012, 02:19 PM   #529
bcmbob is offline bcmbob  United States
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Sounds good. Have you tried swapping the relays or replacing the one on the non-functioning board?
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Old 22nd October 2012, 03:06 PM   #530
AndrewT is offline AndrewT  Scotland
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The relay is in the ground return of the speaker.
You can measure the output voltage of the amplifier direct between spkr out and audio ground.
The bulb tester is to prevent damage due to an assembly or modification error.
But that does not stop the bulb tester being used while actually playing music. But this only applies to lowish Idle bias current amplifiers. It does not work for high bias amplifiers like Roenders 600mA bias fc100.

So back to the chipamp that does not work properly with the vulb tester in circuit. The relay should be on a yimer noit on a voltage detector monitoring the supply line.
If the voltage detector reads a low supply voltage and as a result the relay may, or may not pull in. That is a relay driver circuit failure, not an amplifier failure.

You can over-ride the relay power detection by taking 12V direct to the relay coil, but as said earlier you can still measue outputs by clipping/probing audio ground.
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