Step 17: A Different Type of "volume" (updated)

An easy way to work out the volume in "ml" was to fill a liner  with water then pour the contents into a cup to measure the volume and weight.

I could have measured the mould with a ruler but this was quicker and gave me an indication of approximate weight of resin needed to fill the volume of the mould, you also have to factor in the displacement of the item being encapsulated.

I estimated water would roughly be a similar density and weight to the resin.

Now you know the volume you need to follow the instructions for the resin you have purchased to find the correct ratio of resin to hardener.

I used Polycraft DSM Synolite Water Clear Casting Resin + MEKP Catalyst  (1 to 2%), I believe it is a polyester resin the ratio of Catalyst to Resin was around 1%.

It was pretty hard to measure out the catalyst in such small amounts.

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.

<p>this was painful</p>
<p>thx alot this was very fun build</p>
Absolutely gorgeous work! When I saw it for first time I had to do it. But then I didn't succeed with mold. Now I doing it again. My soldering skills are not good at all, but it works.
Hello,<br>This is an awesome instructables!! And the end product looks awesome<br><br>Just a Q: how would I go about adding a potenciometer?
<p>Carefully, for me to add a pot... it was not worth the risk of failure after the pour, especially when I can adjust it from the source. </p>
<p>hey there, love this instructable, how much did this cost you make and how long did it take ?</p><p>i shopped around for an OPA2107 and some places wanted &pound;12 for a single piece :O..</p><p>but, looks like you put some real time and effort into yours ?</p><p>i wonder what it would look like it it had a frosted with a blue LED in it! :O</p>
<p>Any audio grade Dual Op-Amp will do </p>
<p>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.</p>
<p>Hey! how you identify the audio_in 1,2 and 3 pins in socket?</p>
<p>Did you peel the silver caps before use or do they come like that?</p>
<p>I skinned the caps for no other reason than aesthetics</p><p>If they were Rubicon Blackgate I would have kept the labels :)</p>
<p>I'm curious if this could work with 5 volt? I'd love to build one with a micro USB input for power so that it could be plugged into a phone charger or a computer. It would add to the portability of the amplifier.</p>
<p>Nope its a dual rail Op-Amp +/- the input voltage is halved.</p><p> 5v more like 4.75 after losses would make it 2.5v per rail.</p>
<p>Man - I don't think there are many people who would have the manual dexterity to solder up something like that. I know I don't. It's really well done, very pretty. </p>
<p>And good luck replacing a part in it! ;^)</p>
<p>Nice piece of work there. Your wiring is beautiful. I love all the radiused bends!</p>
<p>I am a electron pixie noob. How does this not overheat or melt?</p>
<p>Good Instructable. One kinda has to want it to go to all the trouble, but once over the &quot;I want it&quot; hurdle, it's cool!</p>
<p>Any for sale?</p>
<p>same here? :)</p>
<p>this is great project, excelent job!!</p>
<p>Excellent but if it is a failure ???</p>
<p>very nice project</p>
<p>A thing of beauty.</p>
<p>This is one of the best instructables I've ever seen</p>
<p>I love this brick of art!</p>
<p>I love the way the components and wiring are made into art in this project - beautiful build :) makes it a look a bit sci-fi!<br><br>I tried to respond to the reverse battery protection comment below but the reply button won't work, so I've put the response here instead<br><br>A better method of reverse battery protection is to use a P-type mosfet &quot;the wrong way round&quot; in series with the positive supply line, and it acts like a kind of &quot;smart diode&quot;. Connect the gate to the negative supply. Then when the battery is the right way, the mosfet's intrinsic diode conducts the first little bit of current, enough for it to turn on, then it acts almost like a short. Connect the battery the wrong way and it<br>stays off, no current can flow.</p>
This is so beautifully crafted! ? look at those curves off that IC! Oh it's orgasmic
<p>The P2P you mention means point-to-point, not peer-to-peer.</p>
<p>One technique for reducing air bubbles is to have your entire assembly on a board. Once you have done your pour, slide the board so that one edge is supported on the edge of a table and tap the underside of the board to dislodge any air bubbles, which will rise to the surface. </p>
<p>Excellent Work!</p>
<p>This is one of my favorite Instructables of all time. I have shared it with many, and am hoping to one day try making it myself.</p>
<p>Glad the readers are still enjoying my Instructable.</p><p>Its great to see the readers builds :)</p>
<p>Its Very Nice !!!!!! </p>
Great instruction ! :D <br>*the diode by the led is just for visual purpose
<p>Hey! how you identify the audio_in 1,2 and 3 pins in socket?</p>
<p>Hey can you please help me with the OPA2107 replacements. i can't find it</p>
<p>Hey, I just wanted to say that this method for prototyping is extremely beautiful. Its very inspiring!</p>
<p>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.</p><p>Keeping the LED after the diode will work as a signal of reversed polarity.</p><p>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.</p>
<p>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. </p><p>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.</p>
<p>In series with that back-biased diode, add the coil of a relay. The coil will limit the amount of current passing through the diode. Then, have the relay break the power connection to the rest of the circuit and maybe light-up a red LED to show the fault condition.</p>
<p>I like your idea much better! I don't like the reverse-diode protection because it could potentially damage the power supply, or it could be damaged and impossible to repair (in this particular case). Having the relay there makes a lot of sense, and there's a lot of very small relays in the marked so it wouldn't add much weight or complexity to the project.</p><p>Honestly going to use that in my builds from now on!</p>
<p>I think it might be better, now that I thought about it some more, to either use a SSR instead of a mechanical relay to cut down on the time it takes to shut down power, or to wire a mechanical relay with a blocking diode so it energizes with correct polarity and block power to the amp until the relay has time to trip</p>
I have never seen precision and art like soldering like that. You operated like a surgeon! Outstanding!
<p>Dear all. </p><p>I am from Viet Nam.<br>I dont know name of Liquid make resin molding.<br>Where do me can order this liquid? (Amazon, alibaba)<br>Please help me.</p>
<p>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?</p>
<p>Not if you run it slowly and don't over heat the work.</p><p>Depends very much on the plastics.</p><p>I am willing to sacrifice a &pound;2 belt to get the result.</p>
<p>That's just what I did, sacrificed a belt. </p><p>But in retrospect, after doing my first ever casting, I do realize that if I sanded more slowly this would not have happened. </p><p><a href="https://www.instructables.com/id/Ice-Cube-Clock-3/" rel="nofollow">https://www.instructables.com/id/Ice-Cube-Clock-3/</a></p>

About This Instructable




Bio: Rupert Hirst "If I can't beg,buy,borrow or find something then I guess I will just have to make it" ...TallmanLabs
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