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-   -   Mini-A Mono-block Is it possible ? (http://www.diyaudio.com/forums/pass-labs/223260-mini-mono-block-possible.html)

thor61 10th November 2012 06:38 AM

Mini-A Mono-block Is it possible ?
 
Hey guys, If building a Mini-A stereo amp, could one use a xlr as opposed to rca's for input and tap the 2 rear pos spk terminals for out-put ? If so what kind of power potential would it have ? :eek:

AudioSan 10th November 2012 08:19 AM

are you talking about bridging? whats the point with a bridge aleph mini? just build a aleph30.

thor61 10th November 2012 08:43 AM

The heat-sinks are much smaller and cheaper, plus I like the idea of true mono's ! So is bridging do-able ?

Zen Mod 10th November 2012 09:06 AM

yes it is

you can do it even without balanced input

enable balanced inputs (as in any Aleph with balanced inputs )

then fed one channel on positive input leg (negative grounded )

other channel fed on negative input leg ( positive input grounded)

of course - output from two hots

AudioSan 10th November 2012 06:05 PM

Quote:

Originally Posted by thor61 (Post 3235774)
The heat-sinks are much smaller and cheaper, plus I like the idea of true mono's ! So is bridging do-able ?

2ch aleph mini (1ch bidge)= around 60-65W dissipation
1 ch aleph30 = 90W dissipation.
but you can run aleph30 on lower rail voltage to drop dissipation and also power.
you will not get more classA power vs dissipation if you bridge 2 aleph mini's.
and aleph mini bridged amps will want to see 16ohm speakers.

thor61 12th November 2012 04:54 AM

I have a 400va, 2 x 18v transformer would this work for a stereo Aleph 30 ? If so what kind of output power could this configuration offer ? Also If using 4) 120mm tall x 200mm wide x 50mm deep heat-sinks 2 per channel be to small for this set-up ? :scratch: http://www.diyaudio.com/store/media/...0-adjusted.jpg

Zen Mod 12th November 2012 07:59 AM

power - as production one

heatsinks will be fine - that's the same as Modushop 4U/400 case

thor61 12th November 2012 03:19 PM

The heat-sink I'm talking about is a 3U 120mm tall. This heat-sink has a temperature coefficient of 0.5 C/W How many watts could this heat-sink dissipate ?

AudioSan 12th November 2012 03:54 PM

0.5C/W and 2 sinks pr side? so 0.25 C/W pr side. you can get away with 100W dissipation pr side if your ambient is 25C or less. and if you get the heat spread well over the sinks surface.

sreten 12th November 2012 04:31 PM

Hi,

Paralleling seems a more real world sensible option for more power.

rgds, sreten.


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