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Need help with Amek Angela A10 modules

Discussion in 'Pro Audio Equipment' started by PhantomBox, Nov 1, 2007.

  1. PhantomBox

    PhantomBox Active Member

    Hi there.
    I'm racking up two Amek A10 (A10-A2, actually) input/output modules from a Amek Angela console.
    I allready made the power supply and now I'm in the making of the in/out connections (MIC in, LINE in, PATCH send and return, BALLANCED output: IF there is one on this module?).
    Now I realize that a schematik plan for this (A10-A2) module would be usefull to have, because I do have a folder full of troubleshooting hints (issued by AMEK), but I don't have any schematics of this precise module.

    Could somebody help me???
  2. moonbaby

    moonbaby Mmmmmm Well-Known Member

    Have you tried the Audio Asylum website?
  3. Boswell

    Boswell Moderator Distinguished Member

    Try Bo Hansen in Sweden. I believe he has rebuilt an Amek Angela console.
  4. PhantomBox

    PhantomBox Active Member

    Nothing there on the Audio Asylum Website.
    And I've just contacted Bo Hansen. Let's see I've I'm lucky.
    By the way, I managed to put the modules to work (they are amasingly quite), but they only work in unballanced mode.
  5. Kev

    Kev Well-Known Member


    lots of people there that do that sort of stuff
    including Bo
    who was a very early member when Group DIY used to live here

    also try Joe Malaone (JLM Audio) for power supply and driver boards etc

    or you could contact me if you need any further advice or suggestions
  6. PhantomBox

    PhantomBox Active Member

    Thanks Kev.

    Actually, I could use some advise.
    Bo told me that I could put an op-amp on the module, connected as an inverted amp with 1:1 unity gain, starting from pin 2 and then phase reversing the signal to pin 3.
    I was thinking of a NE5534 op-amp, since this type is allready used on the module on various parts.
    What do you think? Do you know if in this case I have to connect a 10pF capacitor between pin 5 and pin 8?
  7. Boswell

    Boswell Moderator Distinguished Member

    Yes, if you are going with the NE5534 you should connect a capacitor between pins 5 & 8. I would favour 22pF rather than 10pF for unity-gain configurations. Beware that there are sonic differences between the various makes of NE5534. If you can find samples of the original Signetics part you would get best consistency. Try 10K for the feedforward and feedback resistors, although the value is not critical as long as they are matched.
  8. Kev

    Kev Well-Known Member

    I take it that the you are most interested in a balanced output ??

    yes a unity inverted NE5534 amp ... with the above suggestions is a fair start

    I'd be more inclined to use a dedicated driver unit ... with or without an output transformer

    this output driver could be more powerful than a simple 5534 pair

    something that can driver multiple inputs and can be loaded with a 600ohm input ... like an LA2 ... without fear of loading effects.

    these can be configured to provide output levels from -10 to +28 dbu
    balanced(transformer'd or psudo balanced)
    or unbalanced

    keep the versitility up

    for inspiration ... excuse the shameless plug

    JLM Hybrid
    http://www.jlmaudio.com/JLM Hybrid opamp.htm
    JLM Dingo

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