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Tangentsoft cmoy amplifier

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WATCH RELATED VIDEO: CMoy ( Chu Moy ) amplifier and power output test

Headphone Amp (Chu Moy)


Here is how to put a CMoy headphone amplifier inside an iPod Nano package. What makes it medium level is some of the aesthetic design elements such as exposing internal circuity and the Apple "white-wash" theme. This build would be considered easy if some of these design elements were skipped. This Instructable doesn't cover the CMoy headphone amp build because it has been well documented elsewhere. The one small but main difference is the power LED.

Both the components were then mounted on the PWB instead of the enclosure. C1 capacitor was larger than expected so extra holes were drilled and minor changes to the trace layout need to be made to accommodate them.

Solder all the lead wires, using white 26AWG wire. The leads should be 6 inches long. For this build the lead wires were soldered onto the parts side of the circuit board. For ease of final assembly and for aesthetics, it would be better if the wires were soldered on the trace side of the circuit board. Hint: The iPod packaging came with a plastic iPod holder. Use this as a template. Fit the Back Cover to the back of the iPod package by filing the edges for a tight fit.

Polish the edges of the Back Cover by using finer and finer sandpaper. Finish off with grit wet sanding. Polish the edges with plastic polish to get a glossy smooth finish. The next piece to fabricate is the Battery Wall. These dimensions are approximate. The Battery Wall is not a structural component so it doesn't have to be sized perfectly.

The Battery Wall is needed simply to keep the batteries from sliding around. Use acrylic glue to attach the Battery Wall to the Back Cover.

Glue the joint as shown in the diagram. The inspiration of the Battery Cover came from the original iPod packaging. The iPod packaging has an elegantly designed cardboard box. The box contains the earbuds, docking adapter, etc. This box was used as a type of template for the Battery Cover. First carefully unfold the cardboard box without damaging it. Scan the unfolded box.

Using Photoshop-like software, "shrink" the overall length to a size that fits the batteries. At this point, customize the Apple logo, etc. Printing the Battery Cover can be tricky.

To get the exact size, play around with the overall image size in the Photoshop-like software. First print on plain paper, cut it out, test fit, resize, reprint, repeat. When the size is perfect print it on matte photo paper. Then cut it out with a ruler and Exacto knife and fold it up. To ease the folding, score the fold joints first.

Use the diagram for measurements. Care must be taken during drilling, the iPod package is thin and brittle so it is easy to crack the plastic while drilling. Use water as a lubricant to keep the plastic from melting while drilling. Next fabricate the tabs. The tabs have two functions, one to hold the CMoy circuit board and the other to attach the back cover assembly. Shape the tabs with a file. Sand the edges with sandpaper using finer and finer grit. Wet sand with grit then polish.

Use acrylic glue to permanently attach the tabs to the package. Use the diagram to position. Using a drill press, drill holes into in each tab. First use the CMoy circuit board to mark the center of the holes.

After drilling use a tap to thread the holes. Next, drill corresponding holes into the Back Cover Assembly. To do this, temporarily screw in the plastic bolts so that the heads are just underneath the inside surface of the Back Cover Assembly.

Fit the Back Cover Assembly noting the correct position. Careful, it is easy to mistake the top from the bottom. Next mark the Back Cover Assembly where the bolt heads touch the inside surface. This is simply to mark where to drill the holes. Carefully drill the holes in the Back Cover Assembly.

Use water as a lubricant. Mask off the parts you don't want painted first such as the lead wires on the circuit board and the threaded shafts on the jacks and pot. Start with a light coat of gray primer and finish off with white paint. Scan the circuit board, use Photoshop-like software to create a mask. Provide cut outs for the circuit board components. Include component labels if desired.

Test with paper, print, cut, test fit, resize and repeat. When perfect, print it out on matte photo paper and cut it out. To save matte photo paper, include these labels on the same page as the above Circuit Board Cover. Cut these out and glue them to their respective components. Make sure the "In" and "Out" labels are correctly marked, it is easy to mislabel the jacks.

One final step in the Apple white-wash theme is to paint the inside of the Back Cover Assembly Step 2. Simply spray paint it white and avoid getting any paint on the edges. These can be found at your local hardware store in the form of a U-shaped white drawer handle pull.

Cut the plastic rod to length, round off the edges with a file. Then use sandpaper with finer and finer grit to get a smooth surface. Wet sand with grit, then use plastic polish. Temporarily install the CMoy Circuit Board. Using the attached schematic solder up all the lead wires. Tricky parts are remembering which jacks are In and Out and also the Ground on the Volume knob. Next connect the battery clips.

Start by harvesting 9V battery clips from this Instructable. Cutting down the batteries clips help. Using tin snips, reduce the overall size of the battery clips.

Solder per the schematics. Slide in the Circuit Board Cover, this isn't glued into place. It is simply held in place with friction. Next, fabricate some spacers that fit in between the Circuit board and the inside of the Back Cover Assembly. It should have a hole large enough to freely fit the plastic bolts. Finally, using a hot glue gun, glue the knob Step 6 on the volume shaft. This holder is used to attach the headphone amp to the iPod.

Simply place the iPod in the holder and mark the location of the headphone jack. Remove the iPod and drill a hole using a stepped drill bit. Lastly, add Velcro to the holder and Back Cover Assembly.

Please click here if you are not redirected within a few seconds. Step 2: Fabricate the Back Cover Assembly. Step 3: Fabricate the Battery Cover. Step 4: Modify the IPod Package. Step 5: Apple White-Wash Theme. Step 7: Final Assembly. Step 8: Attach IPod.


No matter what I do my cmoy amp won't work proprorly

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CMoy Pocket Amplifier all-audio.pro Says for about 20$, I can build it myself, anyone have any word on this?

CMoy Amp Kit- A DIY headphone amplifier kit


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Cmoy Headphone Amp

tangentsoft cmoy amplifier

Here is how to put a CMoy headphone amplifier inside an iPod Nano package. What makes it medium level is some of the aesthetic design elements such as exposing internal circuity and the Apple "white-wash" theme. This build would be considered easy if some of these design elements were skipped. This Instructable doesn't cover the CMoy headphone amp build because it has been well documented elsewhere. The one small but main difference is the power LED.

The text is misrepresenting the content of the reference. The reference merely states that a cmoy is not a good tool for evaluating op amps as some will work, and some wont.

How to Build the CMoy Pocket Amplifier


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CMoy Amps? Do I need one? Sennheiser PC350

Searching results in the suggestion that the CMoy amplifier is probably the ideal starter project. Whilst there are many resources to help you build this kit, I would highly recommend heading over to the Tangentsoft website. This site provides a gentle introduction to DIY audio and a very good walkthrough of the build. In addition there are suggestions for alternative choices, background reading and troubleshooting. I will say that the first time I tested the amp I got decent sound, that is testament to the design and the excellent guide I used. I first came across this when I built a kit amp and had problems, as described in this post.

For those intesrested in DIY a CMOY amp can read up on the following.. I did my by following a very comprehensive guide by Tangentsoft.

IAmp - CMoy Amp in IPod Package

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DIY CMoy headphone Amp, point to point: worth it?


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I Wanted to make one of these for a while now, not because my mp3 player lacked the power to drive my ashamedly poor headphone or that my headphones had a high impedance but because I shall be ready.

On a shoestring budget for an amplifier to boost the sound quality from your high-end headphones? After months of painstaking research, you decided to break open your piggy bank for that pair of high-end headphones that you have been dreaming of. But to your greatest dismay, the sound quality was well below your expectation. This was unlike the reviews that you read religiously from headphones-related forums. Not giving in, you dug in and did further readings.

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Comments: 4
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  1. Urtzi

    Bravo, seems remarkable idea to me is

  2. Penley

    as it turned out not in vain =)

  3. Bednar

    I fully share her point of view. Great idea, I agree.

  4. Liam

    You are not right. I'm sure. I can prove it. Email me at PM, we will discuss.