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Kerry

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Posts posted by Kerry

  4. The Multi Amp aka Dynalo Mk2

    in Do It Yourself

    Posted

    I've done this a number of times, but on 1oz copper.  I used a stencil with an oven, which really helps.  I've also de-soldered and re-soldered them.  Another way is if you let the paste melt on the board first without the chip and then apply flux and heat, you'll be sure to have the right amount of solder on the pads.  

    • Like 1

  6. The Multi Amp aka Dynalo Mk2

    in Do It Yourself

    Posted

    11 hours ago, Pars said:

    Kerry,

    Since many (most?) used Amb external regulators instead of the onboard, most would not be able to access the enable pins/function of the regs. Just a thought.

    My evil plan is to get people used to smaller and smaller parts until those regs look big 🙃

    • Haha 1

  8. The Multi Amp aka Dynalo Mk2

    in Do It Yourself

    Posted

    1 hour ago, Pars said:

    Congrats!

    When you saw the offset spike, were you checking the single-ended output (L+ or R+ to gnd)? If you look at the balanced offset (L+ to L- or same for R channel), you won't see this. It is something I noticed awhile back and is caused by the Meanwell bricks not coming up at the same time on power-on. Balanced phones should be fine (common mode or balanced offset won't spike). I would not leave single-ended phones connected on either power up or power down.

    Yeah, I don't have time at the moment, but If I were going to fix this, I'd just use the enable function of the TPS7A regulators with a timer.

    PS  I did these boards in DipTrace and have not converted them over the Eagle yet (which I use exclusively these days), so It's a complete redo. 

  22. What Are You Building Today

    in Do It Yourself

    Posted · Edited by Kerry

    I used a 10 mil flat end mill. You need a really short flute. Length of cut should be about 15 mils. 

    I did several passes since the board wasn’t completely level. 

    Fun stuff

    Edit:  I’ve had no luck with v shaped tools. 

  25. Technical Assistance/Advice Thread

    in Do It Yourself

    Posted · Edited by Kerry

    Just a note.   There are a few videos on the internet on this (not many).  I wanted to be clear that I mixed the alum powder with water about 4 tbsp / cup (or as much as can be dissolved).  Some of the videos show mixing it with acid, which is not necessary, so therefore not advisable.

    The alum I used was a non-ferrous food grade version, so I could pickle some tomatoes or cucumbers if I'd like with the extra :) 

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