This headphone amplifier circuit is different to conventional modern construction techniques in that it is air Wired,P2P (peer to peer) or free form wiring just like in the good old Valve days before the intervention of  PCB's and the transistor.

Rather than a traditional enclosure, the hole circuit is encapsulated in polyester resin to enhance the internals.

If your reading this and thinking why do you need an amplifier for headphones then click here

Although allot of cMoy headphone amplifiers are designed to be portable this one is designed for the desktop although a battery pack could be made also.

This is a pretty long instructable so "make a brew" as we say in Yorkshire and get comfy .

On the upside there is plenty of pictures :)

killer14791 month ago

hey there, love this instructable, how much did this cost you make and how long did it take ?

i shopped around for an OPA2107 and some places wanted £12 for a single piece :O..

but, looks like you put some real time and effort into yours ?

i wonder what it would look like it it had a frosted with a blue LED in it! :O

LG43 months ago
This is an awesome instructables!! And the end product looks awesome

Just a Q: how would I go about adding a potenciometer?
Mjtrinihobby4 months ago
I have never seen precision and art like soldering like that. You operated like a surgeon! Outstanding!
Binleo4 months ago

Dear all.

I am from Viet Nam.
I dont know name of Liquid make resin molding.
Where do me can order this liquid? (Amazon, alibaba)
Please help me.

blackcorvo7 months ago

Add a series schottky diode with the positive supply, and that should make any possibility of capacitor failure from reverse polarity very minimal, while not reducing the supply that much from the ideal voltage.

Keeping the LED after the diode will work as a signal of reversed polarity.

Also, for a better spread light from the LED to the resin, you could have sanded it lightly so it would get a white finish to it.

LesB blackcorvo4 months ago

Another method used to protect against polarity reversal is to put a diode back-biased across the power input. This way the diode shorts out a reversed power supply.

The advantage of this method is that it does not introduce any voltage drop. But the diode needs to be hefty to hold the power supply in its current limiting mode without opening.

LesB1 year ago

Usually you are not supposed to take plastic to a belt sander because it clogs up the sandpaper. Did you have any problem in this regard?

koogar (author)  LesB4 months ago

Not if you run it slowly and don't over heat the work.

Depends very much on the plastics.

I am willing to sacrifice a £2 belt to get the result.

LesB koogar4 months ago

That's just what I did, sacrificed a belt.

But in retrospect, after doing my first ever casting, I do realize that if I sanded more slowly this would not have happened.


jsharp21 year ago

I noticed that you have Top and side views but not bottom. I think a bottom view would be incredibly useful understanding the layout.

koogar (author)  jsharp24 months ago


straydoggio5 months ago

Beautiful work.

jolshefsky7 months ago

Very sexy!

Mrmorton1037 months ago

nod to some of the craftsmanship of valve days reminds me of Hiwatt amp porn
like http://hiwatt.org/images/70HiwattFacesGuts.jpg

beautiful build – much more “3D” than I’m used to looking at electronics.

the screwdriver lead bending tip for this kind of application too.

Jdohl697 months ago

A step by step instructable where the "why" was explained just as well as the "how". I'm going to do this project not just to have a headphone amp for my bose over-ear phones, but to learn more about electronics along the way. Thanks! May be the best instructable I've read.

troyka9 months ago

stunning, never wanted a pre amp untill now.

privatex9 months ago

Beautiful preamp!

Excellent job man!!

sisaiah1 year ago
Amazing and looks cool. I love it great
Boobr1 year ago

Wow! pure genius!

I know it's counterintuitive, but actually pouring a thin stream of resin from a height of 3 feet or so is better for eliminating bubbles than pouring close to the mold.

GunnerXL1 year ago

Remake this amp for second time,added two 9V rechargeable battery and edit the schematic after discussion with my dad.Replacing OPA2107 with TL072NC,added a plastic shell casing and a hook(I need portability).Works perfectly with my Alessanddro MS1i.

LesB1 year ago

Beautiful! I absolutely love the look of the guts-within-clear-resin concept.

I bought this kit (link) to build a digital "ice cube" clock with a blue fluorescent display.
The kit has that acrylic enclosure, but I would like instead to enclose it in resin. This would make it even more like the ice cube of its moniker.

One concern is that contraction of the resin during cure would crack the glass fluorescent tube. Any thoughts on that? I can get replacement tubes on eBay for $6, so I might just try it and see what happens.

Another thought: In order to avoid having to do the sand-and-polish, how 'bout if I put the circuit inside an acrylic box and pour the resin into that? Will the seam between the two clear plastics disappear? Or will the resin dissolve the acrylic? An then there's the heat. I could use polycarbonate instead, which is less susceptible to chemical interaction than acrylic and has a higher service temperature.

Shifting the topic from the enclosure to the amp: Another reason for me to have a headphone amp is that I have damaged hearing (too many Greatful Dead concerts when I was young). The high frequency in my heaing roughly follows a second-order attenuation starting aaround 300 Hz. With a headphone amp, I can build-in filter circuitry to compensate for this attenuation.

Thats absolutely beautiful :O

mboracci1 year ago
excellent job, i think i would have tinted the resin slightly, with a fluorescent pigment and used a uv LED inside, there are so many applications for embedding electronics as art, and this has created eexcitement for the sculpture aspect of electronics
Jimmeh301 year ago
" air Wired,P2P (peer to peer) or free form wiring just like in the good old Valve days before the intervention of PCB's and the transistor."
It's actually called "point to point" wiring and PCB's and Transistors don't "intervene" with anything. I think you mean "invention" or "advent". It's enough to put me off reading the rest of the article for fear of screaming at my monitor in frustration.

VERY nice job though friend! Good to see your fabrication skills far outweigh your language skills :)
pmk2221 year ago
I'm curious as to how you found the correct lengths for the large copper wire and how you knew where to bend them. obviously you had an idea of how you wanted this to look but reviewing the pictures I'm still uncertain how I would be able to get the correct length and shape without making it look terrible. you did an absolutely beautiful job and I wish to congratulate you on a functional piece on art. thank you for sharing this amazing project.
rtozier1 year ago
Thanks for this Instructable! It motivated me to build one myself!
Rummidge1 year ago
Precioso! Very good looking and... It finally works. Gorgeous! I wish I had the patience and skills to build one. I am impressed.
sercancer1 year ago
Hi there!! It is very good instruction. Well done.
Ive got a question. I am thinkin to use this resin coating for my project. Is this copper skeleton essential? Thanks in advance
Is it possible to do this with a electronic project with a screen and toggle switches.
Do you have any examples of this.
M.Hawse1 year ago
My wife bought the parts for this cMoy amp circuit for my birthday so that I could build a couple of these. Anyhow, we managed to get only quality components, yet everything was still very affordable. I just finished making my first one of these 15 mins ago and it worked perfectly the first time--no kidding! My success on this was due to your generous build documentation. I haven't sealed the circuit yet because I want to see what I can do to add mods I can insert onboard (volume, on/off, bypass...etc), but the music that gets pumped out of this is a very beautiful thing. I've tested this amp with all of my Kicker, Philips/o'neil, V-Moda Crossfade, and TurtleBeach headphones. The circuit delivers on every single one. Thanks again for posting this.
greenpoise1 year ago
I am new to all these Headphone Amplifier thing and was just wondering, how is the quality on such design? compared to commercial amps?
davidm2002 years ago
testing the circuit will eliminate any need for diodes..... although it looks pretty cool.... wall sockets? i guess you need diodes since it changes polarity (60hz...well at least in korea)
M.Hawse2 years ago
This is soooo sweet! Now I have to go build one (or two).
Many thanks for posting such a great article with clear photos. This is definitely one of my favorites.
ToXiCATOM2 years ago
wow!it is so coollllllll!!!
atterack8333 years ago
stunning , im thinking of making my xbox laptop (battery powered ) incased in such , what would be the weight of 3201cm3 be ? im assuming heavy but how heavy 7 lbs i assume as water weighs that not bad as fiberglass 3/16 of an inch is 8 lbs
I don't know what resin weighs but 3201cc of pure water would weigh about 3.2kg. I'd assume most resins like this ultraclear one would be quite a bit heavier.
koogar (author)  legless3 years ago
I do know that this particular resin weighs around the same as water.But if it was possible to encapsulate an XBOX your about right legless:P
big waste of parts if ont thing fails lol
360 , and as long as your amp worked than it will , also so long as it doesnt crush it or crack it when it expands , 26 - 28 pound weight , so its not a cary everyware thing and it would weigh more if i did a keyboard and be harder to seal , if i did , it would have to be acrilic
id' worry a LOT about heat. though it'd be cool as heck to see....
ya id have to wattercool , it would be un servisable , but it would only be a special edition , like the seamless polished stainless steel or the seamless brushed aluminum or even the standard material but with raised inserts and a halo theme models , id only make %10 of total sales for each so if i sold 10 id make 1 of each of those , i wanted to make a seperate waterproof model , but i might as well use that one , anything hotter than the chips he uses would get a water block , any others would have a tiny heat sink put on before caseing , all the water cooling system would be tested in a box with the hose`s sticking out for the radiator , but id just run a flow of cold water intstead , maybe in a tub till its warm then id swap warm water for cold 1 bucket at a time , that would use less water , then when i know it works for at least 24 hours id set it up for casing but id just leave a plug for the fan and 2 hoses for the rad , those would be screwed in , and if it gets sub mersed in watter a sensor would shut power to the fan till the temp went up too high , that way the fan doesnt break and the water can cool the radiator it would be big and heavy but i think it would be cool , hold your breath and game under watter (i know i have to make a controller now too) but the main thing is it could drop (oh btw if theres an over load at the fan port it will shut down so it doesnt burn out the plug) to the ocean or lake floor and divers or umaned vehicle could retrieve it and then just replace the fan
badideasrus2 years ago
this is soo cool. i love the open design. i've always wondered why they bother with the boards soemtiems. wouldnt it be just as easy to string together the components without one? well, this prooves it can be done.... just takes up more space than i'd thought it would.

still, that thing is beutiful, and neat. i really want to make one now.
sconner13 years ago
Well done! This looks as good as a commercial product.
I've built a few portable c-moys but none so pretty.
I wish I could think of an easy way to get a battery compartment with touch terminals for a couple 9V's in the mold.
sculpty/playdoe. fill the batery compartment to the brim? not sure, but i'd think it'd work. then after it's set, just dig it out.
DoctorHow2 years ago
great project and great volume quality too! But Is it possible to add a volume knob in this circuit?

jcduplessis2 years ago
Wow! Awesome instructable. Really well done! This art rather than electronics!
shaddoty2 years ago
would a 9v battery work?
szechuan532 years ago
this is gorgeous! i immediately began building a guitar booster pedal, i just need the epoxy and some sealed jacks. this is simply the best way i have ever seen electronics presented, kudos to you!
mrlunna132 years ago
Absolutely beautifully done! So pleasant to the eyes! It looks like it belongs in a display with a "DO NOT TOUCH" sign next to it.
Great ible by the way!!
TJParmenter2 years ago
This thing looks so sweet
A Burr-Brown amp beautifully free-formed in clear resin... engineering, machinery, and art, each at their best!
Marker10242 years ago
This is soo cool! I love the idea of casting in resin. The amp is truly beautiful you should be proud. I hope to make one of these some day. Please post a video of it in action?
tamasic12 years ago
Instead of using wire to suspend the electronics for casting, attach tiny diameter acrylic tubes to the vent holes on the capacitors using a little resin to hold them in place. Have them point straight down, like the wire suspenders. Two birds with one stone. Suspension of electronics and vent tubes without drilling, Possibly invisible after casting.
I really like this, the finish is superb! I was wondering how much power it will handle and if there is a way to add volume control? I have some little 1.5-2" speakers I got from an iMac which I'd like to make resin shells for but they also need driving, this would be perfect!

Now your headphones can go up to 11 TOO!
One beautiful project.
gweeds2 years ago
jeffeb32 years ago
This is so freaking cool. I am going to have to make something in resin very soon. Very creative using the LED power, and the wire sculpture as part of the schematic. I need to think of a good analog electronics project, so I can use a bunch of big capacitors or inductors. Maybe I need a new power supply for something :)

What kind of planning did you do for parts placement? Did you do that in a CAD program (eagle, KiCAD, or something else)?
koogar (author)  jeffeb32 years ago
Hi Jeff

I pretty much laid it out as in the eagle schematic.I then bent the power and ground bus within the maximum dimensions I wanted.
Jeff ,I dont think i would advise encapsulate a power demanding PSU or anyting that generates heat.
This particular project generates no heat.
emdarcher2 years ago
one of the most beautiful electronics projects that I have seen.
Dear Friend.

How you avoided the crushing of components, or fractures of the "block", due to shrinkage of the resin, after catalyzation?
Forgive-me for my bad english.

koogar (author)  Carlos Marmo2 years ago
mix the catalyst at 1% to slow the curing and stop excessive heat.
tpod2 years ago
I can't find .6w resistors. The lowest wattage I can find is 1/8 watt. Is it because I'm in the US? I realize this might be a stupid question. Electronics are not my strong suit.
koogar (author)  tpod2 years ago
1/2 watt would be better you should be able to find those or 1/4

1/8 will work but borderline

in the UK 1/2 watt have been basically phased out for 0.6watt
Pesoen tpod2 years ago
"I can't find .6w resistors. The lowest wattage I can find is 1/8 watt"

1/8 = 0.125
kormsbee2 years ago
Too bad it's a one off. I'd buy one. Its fantastic
nsievers2 years ago
Well done and original. As someone who has built several Chu Moy amplifiers in more traditional ways, I can really appreciate this project.
EET19823 years ago
Hi how are you? I was wondering if it would be possible to put a pot to adjust the volume. This is a great instructable. Thank you for sharing :)
Hey grate build! Im not big into electronics but im starting to and your instructable is grate! But where can i buy all the parts? I looked around on some internet sites like mouser but i don't know enough to make shore im ordering the right parts. I also feel that if i walk down to radio shack and ask for help the people there will have no idea that half these thing even are.

Any help would be grate!
Thanks honda53rider!
dean141113 years ago
hey, how did you elavate the electronics from the bottom of the mold? if you did. becuase im building i differnt project and i dont want the electronics to touch the bottom of the mold. please reply.
Step 14 showed 'Elevating the circuits'- Great idea!
koogar (author)  dean141113 years ago
To elevate the circuit within the casting I soldered a couple of wire risers on the virtual ground running down the middle of the amplifier.

Is there any way that you can add a potentiometer in somewhere for volume control? If so, where would that go?
kivanović3 years ago
Can I use this (http://www.ti.com/lit/ds/symlink/opa2604.pdf) chip instead of OPA2107 amplifier?
koogar (author)  kivanović3 years ago
yes that will be fine Kivanovi
Thank You for your answer!
excellent work!!!
Excellent job! Bravo!
Very nice look!
lstellaus3 years ago
Very nicely done!
tudgeanator3 years ago
Truly beautiful work. On your schematic the current limiting resistor for the LED is 10k, whereas in your writing you say it is 1k a couple of times, jsuk :P.
koogar (author)  tudgeanator3 years ago
Anywhere from 1k to 10k will be good it all depends on the input voltage and how bright you like your LED.

I think at some point down the line I did change it for that very reason :)
XLR8R223 years ago
Wow! Great looking build! I built a similar headphone amp but used a tube/mosfet hybrid design, but I just stuffed it all in a cheap plastic box. This gives me some great ideas, thanks for sharing!
cazcharles3 years ago
Absolutely Fantastic, i'm going to have a go at something similar, could you tell me the values of the turquoise resistors and what voltage LED did you use
Arx3 years ago
What do you think would happen if you powered it with the wrong polarity of adaptor?

I'd be a bit concerned with covering the capacitor's vents. It might make for a pretty big bang.
koogar (author)  Arx3 years ago
I don't see a reason that the polarity could be reversed if your using a manufactured power supply with a jack.

I suppose you could using a battery pack or pick up a power supply with negative centre jack by mistake, but they are pretty rare I haven't seen one in years and believe me I have boxes full of wall warts and power bricks.

And yes it would be a nice bang.

Plenty of commercial products go bang when the polarity is reversed also :)
sconner1 koogar3 years ago
One could (with a few more parts) make it polarity proof by adding a bridge rectifier on the power input. That way it won't matter which polarity is used.
Heck, throw in a filter capacitor and use an AC wall wart.
This basically moves most of the power supply inside the resin and makes it more resilient/flexible. Use any wall wart up to 30VAC depending on the opamp and cap voltages you use.

ooh OOH, and a slide pot on top for volume control.
Oh the possibilities!
Arx sconner13 years ago
Yeah, that's what I was thinking. All except for the 30VAC part. Most common opamps want max +/- 18V.

Rectified 30VAC will give you 42V, and that's not accounting for the fact that under such a light load the transformer will probably give you way more than its rated voltage.

A 20VAC tranformer would probably be about the limit without adding regulation. I would probably not go higher than 15, just for safety.

If you just used a diode instead of a bridge, the 30VAC would work, but you would get a lot more ripple, and would probably not be able to use lower voltage 9VAC etc, which are way more common.

Arx koogar3 years ago
Centre negative is certainly a lot less common, though I have a few in my bin of wall warts. AC isn't all that unusual either.

My main concern would be how it would go bang if it did occur. The X, or K shape on the top of electrolytics is intentionally weakened so that if the electrolyte boils it just splits it open and leaks a little bit. if it doesn't the whole can will often just blow off the top, leaving you with a mess of stringy fluff.

With neither of those possible, it would probably build a lot more pressure, and maybe crack the block, somewhat explosively. (or maybe it would just vent the gas down the wire channels and pressurize the whole thing a bit.. I don't know.)

A diode might be a good idea, just to be on the safe side. A cheap rectifier bridge would be even better, since you wouldn't really have to care about polarity then.

Don't get me wrong, I'm not trying to fearmonger or anything (OMG, you defeated a safety future... you might die, etc.).
It was just an observation. I've been curious about potting electrolytics. Is it frequently done, or only with tiny ones and film/ceramics?

mlawson-1 Arx3 years ago
I doubt anything dangerous would happen if a small power supply was hooked up backwards. First, the Op-amp would crow-bar the power supply at ~1.2v due to pin protection diodes and internal parasitic diodes. Second, the aluminum electrolytic capacitors should just re-form with reversed polarity.

Now, hooking it up with reversed polarity across a car battery? Amp go BOOM!

Regarding the lack of hum, I think it's the op-amp's fault. Still, I bet it would hum if placed near a large motor or over the coil of a big speaker.
Arx mlawson-13 years ago
electrolytic caps don't take well to reverse polarity. Re-form in reverse? I've never seen such a thing. I have seen them blow their cans on reverse or over-voltage. the 4 amps or so that is typical of a small switching "brick" is more than enough to blow their lids under the right conditions.

Again, I'm not saying that it would happen. I am just saying that it's something to consider. The safety vents aren't just there for looks. ;)
koogar (author)  Arx3 years ago
I had considered the capacitor issue, I think the best workaround would be to drill a small pilot hole through the resin towards the end of the capacitor caps,similar to an escape valve.

I chose to leave out any components that were not absolutely necessary as it was a just a concept. Yes if you wanted a protection diode it could be installed.


A simple protection diode could be added to the circuit to prevent the reverse bias i think....
Wazzupdoc3 years ago
louis.m3 years ago
Really elegant and well thought out!
adnanyumer3 years ago
Maldrax3 years ago
Beautiful assembly..
Great Job...
thebluebulk3 years ago
do you sale these?
koogar (author)  thebluebulk3 years ago
no sorry its a one off
Wow, the "skeleton" looks awesome. I've got to do this with my electronic projects. Not a huge fan of the resin for accessibility reasons (in case I want to modify or fix the circuit), and it is a little nasty, environmentally. However, esthetically, it looks really good! Thank you for sharing this! 5 stars!
koogar (author)  The Green Gentleman3 years ago
Thanks and yes I loved the bare skeleton look also :)

But it was too nice to hide and too fragile to use so I think it was a good compromise to encapsulate the amp as a "off the wall" proof of concept.

I realise that it is totally unserviceable but that didn't put me off.I figured if the amplifier did not work or developed a fault in the future it would still be a worthwhile conversation piece. I get allot of comments just leaving it lying around by itself on my desk.

All you can do to safe guard against faults later in life is to use the best components you have at hand and match the paired resistors values with a multimeter especially in the power supply section.


Even if it did stop working it would make a great paper weight - people pay $100's - $1000's for a good paper weight.
That makes perfect sense. And again, it looks awesome!
yoyology3 years ago
This is such a beautiful device. I admire your attention to detail. Inspiring!
gbaines3 years ago
Lovely project, I am trying to make this, but in the UK, I cannot find an 1K 1/8w resistors, maplins, rs-components, digikey and ebay all turn up a blank.

Could I use wire wound resistors, I can find these in some shops

koogar (author)  gbaines3 years ago
Actually 1/8 was my mistake which I pasted a few times it should have read 0.6 watt metal film resistors.You should have no problem finding those or 0.5 watt

I have updated the instructable

Thanks for bringing that up .
gbaines koogar3 years ago
phew, thanks for that, thought they were small!
dmaratt3 years ago
A nice blend of Audio Electronics and Art.
Great Job!
ebayboy983 years ago
Hi, Were did you get all of your parts? I cant seem to find any of them.
jcomtois3 years ago
I've always liked when folks make a "sculpture circuit" like this, and you did a very neat job. The resin coating is an excellent variation too.
recuat3 years ago
Can you just give me the brand that you are use ringht now?
This will help all the member who want to do this project
koogar (author)  recuat3 years ago
Recuat, I just updated the instructable to include the exact type I used.

"Polycraft DSM Synolite Water Clear Casting Resin + MEKP Catalyst (1 to 2%), I believe it is a polyester resin"

Although I have mentioned it twice before in the comments :)


I have spent many years soldering at a bench, and admire your nearly flawless work. A fine job.
recuat3 years ago
Hi, i'm verry intresting on your project, can i know what type of resi did you use for casting? or do you have any link please? Thanks,
koogar (author)  recuat3 years ago
Its actually a polyester resin I believe.

Polycraft DSM Synolite Water Clear Casting Resin + MEKP Catalyst

I did not included much regarding the resin other than it was the water clear type as there are many varieties, which all require different ratios of resin to hardener.

So mixing it etc. is really down to the type you use.


PS118 recuat3 years ago
I hate to be a, "me too", but I'd also like some info on the resin.
lazychino3 years ago
pretty awesome!! i got the same question as below what resin did you used?
koogar (author)  lazychino3 years ago

Thanks for all the great feedback. Its the first time I have cast anything so my experience with it is limited

Its actually a polyester resin I believe.

Polycraft DSM Synolite Water Clear Casting Resin + MEKP Catalyst

I did not included much regarding the resin other than it was the water clear type as there are many varieties, which all require different ratios of resin to hardener.

So mixing it etc. is really down to the type you use.


elabz koogar3 years ago
Did you have to vacuum the resin? It does seem incredibly clear, no bubble in sight.  Can't imagine this being achievable without vacuum yet I myself would not attempt to vacuum an electrolytic capacitor.
Was it not a problem or have you de-gassed the resin before pouring, then poured so carefully?  Or is Polycraft DSM Synolite Water Clear Casting Resin such a great resin that none of that vacuum hassle is needed (I wish this were the case, I'd get myself some)?  

koogar (author)  elabz3 years ago
I didn't use a vacuum dome, apparently this resin has good air rejection
Ron09093 years ago

Thank you for taking the time to explain the ins and outs (no pun intended) of
your creation. A truly informative and inspirational 'instructable' that is a pleasure to read and contemplate along with the highest quality of workmanship.

Thank you :)
2al3 years ago
Very nice project. I really love it.

Would it be easy to integrate a recharchable battery pack alongside the external power supply ?

Also a line-out in combination with a USB-DAC would be extra nice.
legless 2al3 years ago
A potted rechargeable battery pack might not be such a good idea as the batteries can get quite warm while charging.
Nick.D3 years ago
This is seriously an awesome piece of work. I tried building a cMoy amp many years ago. I screwed something up (was probably to impatient).

This has inspired me to try again!
tachtanlee3 years ago
Perfect job!!!
micraman3 years ago
That is beautiful. Amazing. Inspiring. I'm definitely gonna make something along these lines for my friends birthday
mdeblasi13 years ago
Here's what I'd like to see.
A tiny plastic fish, embedded in the resin when you're pouring.
So that it later looks like it's swimming around in there.

Other than that, ♥♥♥!
Now that is a work of art!

I played with resin paper weight stuff years ago. Great fun, smelly... you could clear a whole house in seconds! But apparently you can get low odour versions now?

Anywho, Fantastic concept and construction. Most impressed :-)

I have all sorts of new casting ideas in my head now.....!
NarNar3 years ago
Oh sweet baby Jesus.
TangoDelta3 years ago
This is a really nice project, great work! I always considered free-forming as a method only to be used for cramming stuff in really small spaces, you've proven here that it can be really beautiful!
Mic1003 years ago
It's really a good idea, well explained and well done
Thanks You :)
Tomdf3 years ago
Whoa ho! I love freeform circuits, but if you let them sit on a shelf they get covered in dust and crud. I even tried making some circuits that would fit in bottles, but this, this is a MUCH better solution. Its so stylish and perfect for presentation.

I had no idea this could be done. I am going to go crazy making resin encased solar engines now!

Thank You!
Javin007 Tomdf3 years ago
*perk!* Resin encased solar engines?
Tomdf Javin0073 years ago
Using the resin casting technique explained here, but use almost any of these circuits.

There is a lot one can do with electronics without actually knowing what they are doing :P
laudes Tomdf3 years ago
HeeeHeeHe I agree, I know very little about electronics ( being a web dev. ) but I do enjoy learning.
Talib3 years ago
You have opened my mind to many ideas. What a great idea to project housing.
Sleep E3 years ago
Nice work! You should be proud of your endeavor.
Thank you for sharing it with us.
Nice, It like a piece of art.
iakirov3 years ago
Replicator3 years ago
An inspiring ible :D
That is the coolest thing I have seen. I was wondering if you would make a big one... for home audio. Way cool.
koogar (author)  bigtreehouse3 years ago
In this Circuit the current draw is less than 20ma so heat is not an issue .If you chose a power amp it would not last very long :)

Not only the chip but most of a Hi-Fi amplifier gets warm.


mr.frob koogar3 years ago
I was going to ask how it handles heat as it warms up, but then I realized it's a headphone amp and heat is almost negligible. Beautiful work, thanks for sharing!
Bumbolt3 years ago
Now i remember an episode of Makers magazine's series. You are an Artie! Making look very nice!

Great work!
DaniDiaz3 years ago
Congratulations! Very nice project. Regards from Spain :-)
Buen trabajo y muy bien documentado, merece la pena ternerlo en cuenta.
kholt423 years ago
Yeah, a lot of people already said it, but wow - that is a beautiful piece of work. The symmetry is so pleasing to look at. Thanks for sharing.
bobbym5293 years ago
reivajx3 years ago
La verdad te quedo muy bien, se ve genial.
Muy bueno a la idea. :D * * * * * Estrellas.
skrubol3 years ago
If EM noise was a problem, you could (in your next version) embed metal screening around the circuit attached to the virtual ground.
At audio frequencies, the circuit is probably too small to even pick up EM noise (unless it was coming in through one of the cables.)
koogar (author)  skrubol3 years ago

I had some concerns while building the amp it was starting to look like a TV Aerial but its dead silent even next to my Mobile phone and Wirelesss Router.

But funnily I have a commercial audio product that does pick up EM/RF from my mobile phone paging signal.


rippa7003 years ago
Master craftsman - well done - a true thing of beauty.
mojo-chan3 years ago
Are the silver caps off-the-shelf or did you strip the paint off some normal ones? They look very retro!
koogar (author)  mojo-chan3 years ago
I simply cut the PVC jackets off the capacitors, just for appearance sake.
One thing to remember when doing this is to mark the capacitors negative side before hand.


bishopdante3 years ago
That's a very nicely made piece of circuitry!

World's biggest IC haha.

There might indeed be heat issues with using non-thermal plastic, but it looks very pretty.

One of the coolest things I've seen with resin-encased objects, you can just laser-print onto acetate, and pop some of that in, thus creating writing inside the plastic.
koogar (author)  bishopdante3 years ago
Thanks :)

If you look at the bottom of the instructable I tested for heat issues.It gained 2c over ambient temperature with an hour of use.

With such a low power circuit heat just is not an issue the current draw is less than 20ma.


urant3 years ago
This is just so beautiful that I had to use the Pic as my desktop background. Really, a thing if beauty.
sterago3 years ago
Really impressive! This is beautiful and inspiring ;-)
RMHayes19543 years ago
It's great to see the combination of art and science in action. You've done a remarkable job. Thank you.
EXTREME INGENUITY, ELEGANCE, SIMPLICITY & PRACTICALITY all on you desktop in one Gorgeous little display package !!!


(could be worth THOUSANDS !!!!!!!!!!)

{No, SERIOUSLY, PUT IT IN TATE!!! !!! !!!}
franmmd3 years ago
Great concept and excelent execution. Good work.
iscroman3 years ago
Cool!... I want one of those master pieces... =) I know basics about electronic but I'm not good with the estetic of my creations... XD... What´s the cost of one of them (without the Linksys power adapter). Please, sell one to me! =P
I want one!! Where do i order?
tinmarks3 years ago
This really is a masterpiece! I totally love the look. I wonder how it feels to touch it. In the pictures, it looks like it was glass :).
Javin0073 years ago
LMAO! Loved the christmas tree ornament. This is just beautiful! Makes me wish I knew something about electronics!
markb7103 years ago
A very impressive instructable . You did a fantastic job! I would love to see one like this with sound actuated LED's w/ veering degrees of color ......Just a pipe dream on my part. BTW I loved all of the pictures great close ups with high quality.
iOskr3 years ago
Wow!!! your work it's awesome. Thanks for sharing
Deathcapt3 years ago
looks awesome, how well does it handle continuous usage?

Is heat a problem?
pwillems3 years ago
That is a work of art, well done.
Jayefuu3 years ago
Nice! I swear I've seen this somewhere else before 15th May, was your blog featured on Hackaday or something? Congrats on getting in the newsletter!
plugable3 years ago
Great work with the resin! I suppose is epoxy by the finished look...
Sweet. I've potted things for water proofing before, but I've never thought to do this. Very beautiful and clever.
Super pretty!
sonnybar3 years ago
What brand/type of resin was used? Clear Epoxy?
rimar20003 years ago
You are a MASTER!

Your excellent and prolix work remember me those beautifull Animusic videos
This looks amazing !
randofo3 years ago
Beautifully done. Nice project.
TheRafMan3 years ago
That is just beautiful, even without the resin.
DouglasG13 years ago
I like your circuit.
Brilliant! Thank you so much for sharing!