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Old 5th January 2010, 08:35 PM   #1
dukep is offline dukep  United States
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Default Chipamp with potential

I was inspired to make a desktop amp that work well for an Ipod/ cpu. YOU can build it and be proud of it. It should happily work by your side for many years, like a 'faithful dog'. It should also impress you and others with the quality of sound. Finally, it will evolve to meet your future needs.

I designed this amp with a conglomeration of other circuits that I was impressed with. Many of these circuits are commonly known, but here they are all packaged onto a single board. So, build board as you need, then add an audio source and good speakers = Rock out ~.

Key objectives:
Pre-amp/ amp that fits in a external CD rom case (tight!)
Use available low cost components, Apexjr parts
Full assembly on one easy board layout
Input flexibility (CD, mp3, phono, microphone, computer, alien waves, etc.)
Quality audio output,LM4766 chip amp (0.01% THD from 20hz to 20khz, 30watts/ch)
Fader option between 2 input sources (satisfy the DJ in you).
Bi-amp preamp stage
Idiot proof DIY construction (this is a stretch goal)

Are there interested person's here for this unit??

Duke
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Old 5th January 2010, 09:01 PM   #2
dukep is offline dukep  United States
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to add,
circuit board is 5.5in square
it has tone controls, if you want them
the biamp is 12db with separate opamps, so the bass can be driven by a bigger amp when needed.

don't think I could have fit much more in. See the attached
Attached Images
File Type: jpg osk stereo 80c.jpg (124.3 KB, 577 views)
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Old 5th January 2010, 09:01 PM   #3
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I would be interested in some data and schematics on this chip... I'm currently working on building a "sub miniature" bass guitar amp that I can take to starbucks and play along with a friend on an acoustic guitar... Also, could you please include a link to where I could purchase this chip?
Thanks,
Clayton Langeneckert
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Old 5th January 2010, 09:49 PM   #4
dukep is offline dukep  United States
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I intend to offer the circuit board with the amp chip and a few op amps, Lm4766 and Lm833. Not many people would have these chips in their stock.

A kit is the intention as a option. I'll buy in bulk quality components (met-oxide resistors and pet caps) and set up packs to help the novice.. like legos! It should be build-able by my 12 year old.

Circuit diagram to come (I changed it while doing board artwork)...
Build procedures to come..

It is a very flexible design for inputs. You should be able to configure for almost any input.
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Last edited by dukep; 5th January 2010 at 10:06 PM. Reason: oops
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Old 6th January 2010, 12:00 AM   #5
mikje is offline mikje  United States
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dukep,
Depending on the timing and price, I might be interested.
Mike
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Old 6th January 2010, 12:44 AM   #6
troystg is offline troystg  United States
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It could be called a "miniaturized" stereo since you only need source and speakers to have a full system. What's impressive is that it can scale up to be a big system without waste!
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Old 6th January 2010, 12:04 PM   #7
pool is offline pool  Sweden
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I'm interested, it would be perfect for the kids tv/game setup. I can see some other uses to so depending on the price I would probably be interested in more than one board.
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Old 6th January 2010, 02:33 PM   #8
dukep is offline dukep  United States
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Would the group want just the amp chip and board?
or
A kit to include resistors, caps, opamps, pot.. etc
There are yet other options
Zen (volume pot only, 1-2 opamps)
Standard (tone controls)
DJ (mixer and phono stage)
and then there is the biamp stage.
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Old 6th January 2010, 02:43 PM   #9
mikje is offline mikje  United States
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Quote:
Originally Posted by dukep View Post
Would the group want just the amp chip and board?
or
A kit to include resistors, caps, opamps, pot.. etc
There are yet other options
Zen (volume pot only, 1-2 opamps)
Standard (tone controls)
DJ (mixer and phono stage)
and then there is the biamp stage.
Is it possible to get ballpark figures for the prices of different combinations?
Thanks,
Mike
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Old 6th January 2010, 08:18 PM   #10
Apex Jr is offline Apex Jr  United States
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I've been working with Dukep to find the right components and
have them in stock and offer killer pricing on this.

Depending on the final PC Board used I will be able to offer quite
a few of the items needed and once it finalized will also offer a kit
to finish the project. And have some choices depending on how
fancy each of you want to be.

Steve @ Apex Jr
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