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Pavel Dudek's super Gainclone group buy

Colour of the pcb

  • Black

    Votes: 31 37.8%

  • White

    Votes: 12 14.6%

  • Red

    Votes: 14 17.1%

  • Blue

    Votes: 13 15.9%

  • Yellow

    Votes: 3 3.7%

  • Green

    Votes: 13 15.9%
  • Total voters
    82
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A

AndrewT

R.I.P.
Joined 2004
I was following this discussion, but now I am lost.

I think the problem is that the poster does not know what he/she needs. They don't know the difference between bridged and balanced. They are not the same!
hfxrzw said:
Hi PA, I can only agree with that :)

In the documentation there's quite a bit of documentation on possible connections/jumper settings except for the one I'm contemplating. I'd like to use them as balanced monoblocks. Hot to one channel and cold to the other? Could you advise how to do so with the jumpers etc. Thanks!
Click to expand...
A balanced monoblock cannot remain balanced if one splits the balanced impedance cable into separate Hot and Cold feeds to two separate amplifiers.
 
Last edited:
N

nthall

Member
Joined 2015
AndrewT said:
I was following this discussion, but now I am lost.

I think the problem is that the poster does not know what he/she needs. They don't know the difference between bridged and balanced. They are not the same!A balanced monoblock cannot remain balanced if one splits the balanced impedance cable into separate Hot and Cold feeds to two separate amplifiers.
Click to expand...

I known the difference between bridged and balanced. Would the amps work if you split the balanced input, into two separate balanced inputs, and see the amp for Balanced Stereo Mode, and then bridged the two stereo outputs into a single speaker input? Like they do with multiple power amps in PA systems. Would Impedance be too low, and would the chip remain stable?

And the impedance difference between the hot and cold sides of a balanced cable can be delt with split into two amps, It's not possible with the stock build of this amp, but could be compensated for by tweaking some of the components.
 
Vunce

Vunce

Member
Joined 2014
Paid Member
Hi hfxrzw,

Maybe try this,
Set the jumpers on JP1 for single ended non-inverting,
From balanced connector: Hot to JP2(+), cold to JP3(+), Ground to JP3(G)
Output: output closest to the JP5 stencil goes to speaker(+)
output furthest from the JP5 stencil goes to speaker(-)
I've used this type of configuration on previous lm4780 balanced input/bridged output mono amplifiers. The difference is this one has an opamp input section.
Just trying to help out:)
 
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