Jump to content

The Multi Amp aka Dynalo Mk2


Recommended Posts

Ordered off board version of golden reference boards from seeedstudio 1.6mm 2oz copper

Will have some extras for grab when my order gets here.

Kevin, are Golden reference boards finalized? You mentioned that there is oscillation unless some parts are not omitted...

Link to comment
Share on other sites

the oscillation was in the ltspice simulation.


board run now, will know for sure once i build it.


possibility of z-foil .15 spacing resistors, going to screw up

the ground plane on the back


will try later


no 20 ohm z-foil resistors that i can find...

Edited by kevin gilmore
Link to comment
Share on other sites

  • 4 weeks later...

one of my boards can't be adjusted below 1.3v/-.4v, can/should I change r26 to get the values closer to 0?


Also getting like 3V input DC, is this normal? Right now I'm floating everything and tying IEC ground to earth, amp boards are taking com from the power one supply (equivalent)

Edited by nopants
Link to comment
Share on other sites

Back when Monster cable was first selling their cables with 3 sizes of wire (fat for the bass and thin for the treble), Frank van Alstine offered to wire the thin ones to an AC plug and plug it in while a Monster salesperson held on to one wire in each hand.  For some unfathomable reason, the salesperson declined. >:D

  • Like 2
Link to comment
Share on other sites

  • 1 month later...
  • 2 weeks later...

I happened to order 3 extra amp board sets when building this amp and I won't be using them.

Anybody needs a set, send me a PM and I'll ship them your way for cost of postage. These are rev 9, with smd ptza06/56 and the rest through hole. 

UPDATE: all board sets spoken for.

Edited by MLA
all boards gone
Link to comment
Share on other sites

  • 1 month later...

1.25 volts

160 ma current draw on each rail at 20v


Hi Kevin:

How hot do the heatsinks on your GoldenReference PS get at this condition?

I just tried running my SUSY Dynalo with the GR PS running on 18V rails and about 18mA per output mpswx6 devices (360mV voltage drop on the 20 ohm emitter resistors). I was using the same heatsinks as shown on your pic but they got too hot to the touch and I had to put much larger heatsinks on. I am a bit surprised. 

Edited by mwl168
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.