Crystal cMoy Free Form Headphone Amplifier

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.

Comments

[dean14111]

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.
thanks

[Tspherix]

Step 14 showed 'Elevating the circuits'- Great idea!

[koogar]

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.

http://runawaybrainz.blogspot.co.uk/2012/04/audio-crystal-cmoy-freeform-headphone.html

[recuat]

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
thanks....

[koogar]

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 :)


Thanks

Rupert

[recuat]

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]

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.


Cheers

Rupert

[PS118]

I hate to be a, "me too", but I'd also like some info on the resin.