Finished my UCD180 amplifier

[ekaerin]

Hi all,
I have finished my UCD based poweramp. The sound is really good.
What is nice is the clean sound even at high levels.

I must say the guys at Hypex made some really nice work down there
in the Netherlands.
No pops, no hiss, no hum just clean music.

/ Mattias

[ekaerin]

And the outside,
The box is macined aluminum. The bottom and front/back are about
4.5mm thick.
I have mounted the trafos on silpads (well, they are the least efficient).
Since I had to rewind the trafos I never put the mylar tape on the secondary-ambient
back on. So they should sissipate some heat to the bottom.
Also I did not have time to make supply boards so I used experimental
boards which I reinforced with desolder-wire where necessary.

/ Mattias

[badman]

Just kidding My UCD amp is red too Looks nice!

[classd4sure]

That's actually a cool cover, until someone spills their drink on it.

I'd recommend finishing off that top edge with some sort of trim, you'll thank yourself for having done it when someone's shirt doesn't get caught in it and pulls the sucker down.

[ekaerin]

Hi,
Thanks 4 the replies.
The red was some leftover from my RC model boat and I think it is cool.
Usually I always use Bruel & Kjaer green, which is a bit "Instrumentation".

The amp will not sit on the record player so no one will spill anything
on it.
But you are right, I don´t need the ventholes and to keep dust out I might
just change the top. The amplifier was finnished in panic like 1:30 in the
morning for my friends wedding in the evening the same day.
It was driving a pair of JBL PA/Studio speakers with 15" in the bottom.
Did we play loud?...Yes we did! (100+dB/W SPL)

/ Mattias

[FastEddy]

I notice that those are honkin' speaker cables ... type? ... DIY?

Also I believe that those are "unbalanced" RCA input type ... yes?

[ekaerin]

Hi,
The speaker cables on the pictures are way to thin, about 0.5mm2.
I will use at least 1.5mm2.
The speaker connectors are isolated High current/voltage type banana
jacks on the amp. On the cable I just put Wago type banana plugs.
I used banana plugs for simplicity and thats what I had at home.

The input connector is a 3pin DIN type connector often used for microphones
when XLRs are not used. I didn´t have space left for the XLRs.
I wanted to use the Neutrik XLR/Tele combo but that guy extends even
further into the case than the standard XLR.

/ Mattias

[ekaerin]

Here is a better pic of the connector

[FastEddy]

Assuming you were able to use the Neutrik XLR/Tele combo ( ?? http://www.neutrik.com/content/Produ...l2id=204_57051 ??), how would you wire it up??

I'm looking for a relatively standard, reproducable way to do this connection for both balanced and unbalanced amplifiers and pre-amps ... a serious DIY project that may go to production.

Thanks

[ekaerin]

Eddy,
How to wire the XLRs and teleplugs are standardised. Also if you use
2 pole teleplug, you dont have the ring on the connector, it will work
on a balaced input since the negative signal will be grounded.
But it is best to make the unbalanced part at the sending end and use
balanced cable/connection to the amp letting all common mode noise
picked up by the cable be suppressed at the balanced inputstage of
the amp.

The Neutrik connector have separate terminals for the XLR part and the
teleplug part that you can solder wires to or get the PCB mounted one.

Please see the attached pdf from RANE it is very good reading as are all
of their technotes, at least to me.
I take the liberty to post it here.

/ Mattias