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Old 18th June 2010, 04:31 PM   #201
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It is difficult to change the gain without unbalancing the circuit global characteristics. I wouldn't try it at all.

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Regi
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Old 18th June 2010, 04:44 PM   #202
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My previous power amp is 12x and it allowed me to listen with vol at 12 o'clock, with very nice sensitivity of the vol. In comparison, 31 times of the MyRefC is quite a lot more for me on 96dB speakers... All the resistors seem to be in the right places. I guess I won't be messing with anything, but the sensitivity is less than ideal for my application. I'll give it a propoer listen tomorrow.
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Old 18th June 2010, 04:52 PM   #203
AndrewT is offline AndrewT  Scotland
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That's an extra 8dB of gain.
I would not reduce the gain of MyRefC by 8dB.
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Old 18th June 2010, 08:00 PM   #204
billo44 is offline billo44  United Kingdom
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Quote:
'There won't be any room for stand offs, unless they are <0.95mm high.
I envisage a double layer of thick insulating tape to keep the soldered pins from touching the aluminium chassis floor. But, will the lid fit without buckling or crushing?'
Andrew, have you got space to mount the smoothing caps off board, lying down...
Or use a hole saw to put holes in the top of the case with the tops of the smoothing caps poking out?

Too messy for you perhaps?

Bill
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Old 19th June 2010, 01:15 AM   #205
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Default More cap questions:

I am still soldering away and making good progress. This is really fun. I think this one is obvious but, to verify, is C1 the unlabeled 220uf cap on the lower left hand corner of the board?

C4 and C5 came supplied with 10 mm lead spacing and the circuit board has 7.5 mm spacing. How are you dealing with that?

TIA,

rick
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Old 19th June 2010, 08:39 AM   #206
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Lazarus500 View Post
is C1 the unlabeled 220uf cap on the lower left hand corner of the board?
C9, C14, C1 & C2 are our 220uF. The unlabeled 220uF is right next to C2.
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Old 19th June 2010, 12:30 PM   #207
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Still head down and soldering stuff on board number one of my 6 channel project - my plan being to fit the whole thing into one custom case and use 3 of these trafos - when I suddenly thought that it might not be such a good idea to have all that stuff using just one 13A IEC?

Could someone advise me about this or maybe suggest any other reasons why this is not such a good idea. I haven't ordered the trafos yet and haven't even started the case, so it's not too late to alter my plan.

Thanks

Gary
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Old 19th June 2010, 05:30 PM   #208
AndrewT is offline AndrewT  Scotland
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where are your speakers?
Why do you need all the amps in the same chassis?
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Old 19th June 2010, 05:51 PM   #209
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Stanphink, IMHO, I would take the approach of making 3 stereo amps in 3 different cases. It will give you 3 times less the weight, and you will have the modularity advantage. Just pile them on top of each other for a 6 channels system.
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Old 19th June 2010, 06:08 PM   #210
udailey is offline udailey  United States
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Gary
I like the idea of all in one case because you will do less metal work and it will cost less overall.
I otherwise would prefer multiple cases. Grounding will be easier if you have a problem. Can you imagine tracing down anything in there if you have an issue on one or more channels? I mean, maybe if it was 30" wide and a foot or more deep it might be easy to work around in but otherwise, with channels stacked on top of each other or real close together it is going to be a pain later.
Uriah
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