Re: Tannoy Reveal and LM3886 power amp IC

In article <QaNGj.26622$vr3.11573@xxxxxxxxxxxxxxxxxxxxxx>, jakdedert <jakdedert@xxxxxxxxxxxxx> wrote:
Eeyore wrote:

Wink wrote:

"Arny Krueger" wrote:
"Wink" <x@xxxxx> wrote in message

I see some 3,300 uF 80 volt
Nichicon LQ-M caps for sale on the Active Electronics
web site for less than $1.60 each... ;-)
Did you mean All Electronics?


http://www.allelectronics.com/cgi-bin/item/EC-3380/140300/3300_UF_80_V_ELECTRO
LYTIC_SNAP-IN_CAPACITOR_.html
whoops, yes All Electronics.
It turns out they're a very good size. I probably can pack 20-ish kufd
a side in there, but would start at 3300 and experiment. I ordered a
dozen.

Well ..... you may not like how 20,000 uF sound ! It will change the clipping
behaviour agin.

Couldn't this strategy also overwhelm the the preceeding stages
(transformer/rectifier/fuse) by creating a huge inrush current upon turnon?

Thats why some amplifiers have a slow start circuit.

Also, while monitoring the rails at the circuit, any fluctuations
are caused by the wiring and power supply. Any changes with various
capicitors can be monitored here. If there is no change, I don't
think there is any way the output could change.

greg


My advice to you is to get a larger amplifier so you're never close to
clipping.


I've resolved the voltage on the 63 V BGs torment. I ordered toroids
with this sec: 50-43-0-43-50. The 43 V taps will run produce 56 V
under load. A compromise value, not excessively low.

Why? With proper voltage filter caps, the original would appear to be
adequate. The 63 volt rails were only--marginally--problematic to the
63 volt rated magic caps.

Err .... if only life were that simple ! Capacitor input PSUs are not like
resistive loads.

Should I eject the BGs like a retching dog to Ebay hell, the 100 V
winding will allow a return to 63-ish volt operation, maybe with the
cool Nichicons.

Or cool Panasonics or cool Samwhas or cool Rubycons or cool Nippon Chemi Cons
!

The damn BRAND is IRRELEVANT !

Graham

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