DC Entries: Last Batch

posted Feb 28th 2007 11:50am by Will O'Brien
filed under: contests

Here’s the final batch of entries we received and considered for the Design Challenge.

[Chris] sent in a stereo amplifier (watch out for pop-ups) designed for iPods (or similar) using LM386 amps and a minimal parts count.

[Fabian] submitted this excellent tube amp. It’s based on the ECC83/12AX7 tube, and runs off a mere 12-14VAC.

[Edgar] sent in this combination PIC/AVR programmer.

Finally, we’ve got a simple PIC/EEPROM programmer by [Ian]. (view the unzipped version here)

Comments [15]

15 Responses to DC Entries: Last Batch

ian says:

February 28, 2007 at 12:29 pm

I also made an instructable for my project so it is easier to see:

http://www.instructables.com/id/EWF5MO717GEWT14B3B

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CHAD says:

February 28, 2007 at 2:41 pm

looks like the first on in this list (chris — and his amp ) have gone over his limit can comeone link this of cache this

thanks

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CHAD says:

February 28, 2007 at 2:42 pm

forgot to add the tube preamp is badd a$$ cool one !!!

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joelanders says:

February 28, 2007 at 9:48 pm

i reeeally like the tube preamp. its awesome to see classic hardware being used instead of some $1.19 ic from radio shack.

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Monkey says:

February 28, 2007 at 10:12 pm

Cool stuff. The stereo amp link is down, seems a bandwidth problem.

I wish I would have put in an entry… maybe next time.

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lonasindi says:

March 1, 2007 at 12:34 am

I would love a better write-up on the tube amp, I don’t have a lot of experience building stuff like that, and tubes are heavy stuff.

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Alan says:

March 1, 2007 at 1:00 am

The tube amp is very interesting, it would have been nice to see the finished product though (or at least a 3D model)

Congrats to all the participants, each one was well done.

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fabian says:

March 1, 2007 at 2:58 am

hi, i was the one who posted the tube amp. it’s pretty easy to build since it needs no biasing or adjustments. But I can write a more detailed instruction for building and tweaking the amp. It will take me a few days, however…

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Edgar says:

March 1, 2007 at 7:33 am

Hello,
I did a page for my project the AVR/PIC Programmer, it is located here: http://www.ebarranco.com/had06/

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Andrew says:

March 1, 2007 at 1:54 pm

there were only four entries?

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fabian says:

March 1, 2007 at 2:25 pm

@andrew: no, there’s lots more; check out
http://www.hackaday.com/category/contests/

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james says:

March 2, 2007 at 10:01 pm

awesome tube amp. but i’m having some trouble getting started.

does anyone have a part list for digi-key or other distributor? im having trouble find parts for this sweet tube amp.

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fabian says:

March 2, 2007 at 11:17 pm

Hi, I only have a partslist for a German distributor. But I might help you finding the parts if you want. Write me to fabian [at] tubedogg [dot] de.

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person says:

March 4, 2007 at 12:41 am

These contest entries have been great ideas.
I just have one question.
What are you guys using to read your .sch files?

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Aaron says:

March 8, 2007 at 6:04 am

Thanks to Chris for adding the .ISO files. I don’t really want or need one but hey, I’m sure I have the parts laying around and if the work is already done for me, why not. Thanks!

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