$175 Class D amp--120 wpc

roymail · « **Reply #1260 on:** 16 Apr 2010, 07:02 pm »

Bob, very nice job and thanks for posting pics!

6SN7 · « **Reply #1261 on:** 16 Apr 2010, 07:06 pm »

Quote from: srb on 16 Apr 2010, 06:11 pm

Bob,

How did you do the engraved legends on the subpanel?

Steve

Steve,
The lettering was done with some metal stamps (punches?) I bought at Harbor Freight. I had to make a jig such that each letter lined up with the others, and some of the stamps had to be shimmed with masking tape for better alignment (what do you expect for $4.99?). The letters were done one at a time. I spent more time building the jig and making samples than I did actually doing the final stamping. I considered filling the letters with paint but gave that idea up in the interest of finishing the project.
Bob

srb · « **Reply #1262 on:** 16 Apr 2010, 07:11 pm »

Quote from: 6SN7 on 16 Apr 2010, 07:06 pm

Steve,
The lettering was done with some metal stamps (punches?) I bought at Harbor Freight. I had to make a jig such that each letter lined up with the others, and some of the stamps had to be shimmed with masking tape for better alignment (what do you expect for $4.99?). The letters were done one at a time. I spent more time building the jig and making samples than I did actually doing the final stamping. I considered filling the letters with paint but gave that idea up in the interest of finishing the project.
Bob

At first I thought they might be individual punches, but the impressions were cleaner and more even than I expected, and they lined up too well. Now I understand how, with your construction of a jig (and use of shims!).

Some years ago, I used some number punches and didn't get quite as even results as you did. I was stamping into tough steel, and if that subpanel is indeed softer copper, that could explain how you were able to get superior results.

Nice job!

Steve

Robert F. · « **Reply #1263 on:** 16 Apr 2010, 09:57 pm »

My amp is done now. First amp I have built. Sounds great,however, you folks that have one already know that.

roymail · « **Reply #1264 on:** 17 Apr 2010, 04:35 am »

Robert, yours turned out very nice, too I really like it.

The sheet metal lining looks good. Thanks for posting the pics for us to see. Glad to hear it's sounding good, too.

Please come back with some additional impressions about how well it performs after you've had a chance to do some more critical listening. What speaker are you using with it?

ebag4 · « **Reply #1265 on:** 17 Apr 2010, 04:39 am »

Very nice Robert! I really like your repurposed vents

. Very clever.

Best,
Ed

6SN7 · « **Reply #1266 on:** 17 Apr 2010, 01:58 pm »

Quote from: Robert F. on 16 Apr 2010, 09:57 pm

My amp is done now. First amp I have built. Sounds great,however, you folks that have one already know that.

Nice work, Robert. I really like the engine turned metal--a nice surprise for those looking inside.
Bob

pumpkinman · « **Reply #1267 on:** 17 Apr 2010, 07:57 pm »

Quote from: 6SN7 on 16 Apr 2010, 04:05 pm

I finally completed the assembly of my first mono bloc--the box for the second one is ready to be filled. I'm using these to power my 4 ohm Magnepan MG12s, and although this amp is running a bit warmer than it did when it was sitting out in the open, I think it will do fine with the current array of vent holes (the floor separating the two boards is vented as well as the top and bottom lids). If I ever upgrade to a Super D, I'll use these same boxes but put the output boards in side-ways.
Bob

Absolutely stellar Bob. If you have a warm fuzzy feeling inside there's a good reason
after seeing your pics......................Bill

etcarroll · « **Reply #1268 on:** 17 Apr 2010, 08:13 pm »

Pumpkinman -

I just fired up your amp with the Maverick 1 DAC, see that thread for my future observations.

I must say, it all sounds very nice.

Gene

MLS · « **Reply #1269 on:** 17 Apr 2010, 09:06 pm »

I am interested in how the Mav D1 and the ClassD amps sound together.

Scott

bundee1 · « **Reply #1270 on:** 17 Apr 2010, 09:35 pm »

Beautiful work all around and thanks to everyone involved in the project. I am also interested in how the Mav D1 and Class D amps sound together.

I am a little confused as to how the output impedance of the Class D works with the Maverick and why.

Mariusz · « **Reply #1271 on:** 17 Apr 2010, 09:39 pm »

Keep on eye for this and other threads on Cheap and Cheerful.
Lots of good people with one goal in mind: great fidelity on the budget.
In the future I (we) will compare Class D amp(original) with Maverick DAC/pre, Nelson Pass B1 buffer (finished) and Dodd Audio battery powered tube buffer kit (in the works).

Mariusz

bundee1 · « **Reply #1272 on:** 17 Apr 2010, 09:43 pm »

Thanks Mariusz. I look forward to it.

pjchappy · « **Reply #1273 on:** 17 Apr 2010, 10:45 pm »

For those using a separate switch and fuse, how exactly do you wire it together? I have jtwrace's case and I cannot tell how to connect this via the pics. Not sure how to do it via the Class D diagram, either.

Thanks!

Paul

mjosef · « **Reply #1274 on:** 17 Apr 2010, 10:56 pm »

Switch first in line then followed by fuse..

roymail · « **Reply #1275 on:** 17 Apr 2010, 11:12 pm »

Quote from: pjchappy on 17 Apr 2010, 10:45 pm

For those using a separate switch and fuse, how exactly do you wire it together? I have jtwrace's case and I cannot tell how to connect this via the pics. Not sure how to do it via the Class D diagram, either.
Thanks!
Paul

This diagram should help.
http://classdaudio.com/documents/transformer_115VAC_instructions.pdf

jtwrace · « **Reply #1276 on:** 17 Apr 2010, 11:29 pm »

Quote from: mjosef on 17 Apr 2010, 10:56 pm

Switch first in line then followed by fuse..

IEC > fuse > switch

pjchappy · « **Reply #1277 on:** 18 Apr 2010, 12:27 am »

Should have been clearer in my question. I understand the order, I can't tell for sure how to hook up the power switch, as it has 3 terminals. Again, I'm referring to the set-up using jtwrace's case.

From what I'm seeing, it looks like the transformer's positive leads are going to the center terminal on the switch and then the positive terminal on the switch is connected to the fuse holder. Then, the IEC negative and the transformer's negative leads are all hooked up to the 3rd terminal on the switch. Is this correct?

Thanks again!

Paul

jtwrace · « **Reply #1278 on:** 18 Apr 2010, 01:16 am »

Yes, the two red leads from the tranny go to the center of the switch.

see here http://www.audiocircle.com/index.php?action=gallery;area=browse;album=2778 take note of the white writing of on the switch as well.

No the IEC ground can go to the case. See the above gallery with the picture marked "tranny". The two black transformer wires go to the switch. There is no ground on the transformer.

Is this clear enough?

pjchappy · « **Reply #1279 on:** 18 Apr 2010, 01:35 am »

Got it.

Meant to say IEC negative in my post above.

(edited that one. . .)