Not sure if it is the same thing but I was having this with some diaphragms that had too low a resistance (ones coated with graphite). Using the other coatings like the anti static gel has got rid of that, perhaps trying acetone and then recoat? Chaz

Right so I know it's been quite a long time since I last posted that I've been progressively working on them in between getting a new job. Wachara- I hasve got some antistatic gel and seems you working reasonably well, it's got rid of all the problems that I was having with rubbed graphite (was...

Thanks, not finished yet, want to put a nice foam pad on it but its just one of these ear defenders taken apart - http://www.clarkforest.com/shop/safety-clothing/ear-defenders/peltor-optime-2-ear-defenders Quite nice a light, easily adjustable and fits our size of phones really well (luckily I...

A few work in progress pics, need to make a new headband pad, ear pads and sweat guard and work out a few kinks with the balance of the drivers but initial impressions are good, very deep bass and articulate with reasonably reserved mids. Any fellow builders got any advice on what modifications...

Think you hit the nail on the head, tried graphite (don't have any cleanser gel but will try to get some) and that bought the volume needed right down and seemed to bring out the full range nicely! Just putting the bits together now but you know how long the sewing bits around the pads takes...

Welcome and they look great! So put together one of the drivers this morning to see how it goes and makes a sound (yay!) but a couple of things I could do with some advice on: - bass response seems ok but treble is low- need more tension on the diaphragm? - needs a lot of volume to drive them...

Thank you for the compliments! Just waiting for the 0.5mm spacer parts now and pretty sure I will have everything ready to put them together though I fly out to sit of a beach in Malta till Friday so maybe next weekend I will get a chance :-) Koss is an even bigger problem in the the UK! They...

Thanks for the advice all - I went and used the sharpie option (after doing some test runs) so I could get nice a precise with the copper I wanted to remove. Seemed to work well and left the rest of the material in good shape. Also been putting together the cabling, bought a set of Stax Lambda...

The active area is about 95mm x 65mm eliptical using 2mm holes and around 63% open area. Have made them quite up to the edge so there shouldnt be much etching needed. They are quite compact and perhaps the active area could be a bit bigger but will look in to that next time. Question - when...

Here's some of the first bits from the CNC and makings, hopefully will be able to get on it next weekend when I am back from holiday :-)

Thanks for the diagram very useful :-) That is some serious resistance across the sheet, perhaps this is the issue as mine is only a normal multi meter and goes up to 2000k which is apparently no where near! Guess I will just have to give them a go and see what works. Again any steers on...

Well normal I would be all up for the endless experimentation but having tried the rubbing graphite and anti static with no luck (though not sure if that is due to my cheap multimeter) and an hour and a half trying to get the elvamide to dissolve according to the instructions and not a single...

Hello all, Progress is getting there on the phones (had some of the wood cups made but weren't quite perfect so having some more done) and more importantly finally got the Mylar through so plan to do some experiments before I actually make up the films but as always I have some questions for...

If I went bigger now where I would I be able to get on the next pair! ;-)   Actually I did have a nice thought about being able to maximise the area and keep the same basic shape (which I quite like) and that is to make the elipse slightly square sided, just a bit and should help increase...

Thought I would just quickly share a little screen shot of the exploded view from CAD of the phones I am currently making (obviously they are the machined blanks and will make some minor alterations like removing the tab from one of the spacers so I can get to the copper on one of them...

Oh just another quick clarity point is the coating purely to get a high resistance coating or are there other properties required from it?   Chaz

Quote: Ah right, well I plan to put a moisture protector (or whatever it is called) between the ear and the driver but guess dust can get in to the backside that is not covered. On the moisture protector, I was thinking of using some EPDM self adhesive foam and mount the 2um mylar to that...

Quote: Spritzer, may I lay down my hat in honour of your exceptional knowledge of everything headphone   I would post a wanted out on the forum for something like the SRD-7 but I have not posted enough yet (couple more to go!) but if anyone knows of one that would like to sell I...

Quote: Good advice thanks, do you know what the step up ratio is on the Koss? I know there bias is about 320v which is a little low for this headphone.   Also take it I probably want to be aiming for using the Pro bias from the Stax to get the 600v range rather than 230v?   Chaz

Yeah I think that is what I will end up doing (or find a pair of Koss ESP-6's, which are pretty cheap and simple dimantle for parts).   At the moment there is a Stax SRD-7 (around $125 USD) and a Stax SRM - T1 (around $500-600 USD) on ebay at the moment, obviously I know they are very...

Hmmm sounds like a bit of mine field of actually getting the right bits. Annoyingly I know a bit of the theory of how all these bits and pieces work but its information like this that is the real difference between something technically working and sounding great - so again thanks. Think I...

Good advice, not especially easy things to just source so I have found so far. What is the actual difference between and Audio and power transformer (I know one is designed to carry decent current and one to match impedance but what makes them different)? Reason I ask is so I can spot which ones...

Quote:   Great stuff spritzer thanks, quite similar to a diagram I found previously.   In terms of Transformers found these: http://www.maplin.co.uk/miniature-250ma-transformers-3688 (if you look at the 9v application because with a bit of quick math 240v primary and a 9v secondary is...

That's great thanks! So I have managed to source some lovely Cherry wood (only piece the entire timber yard had and is just big enough for the two cups with a little spare! So in terms of the energiser I was thinking of making a nice basic one to get used to it and work out exactly what...

Wachara C - Also how are you getting on this those enormous Jecklin Float type phones you mentioned a few posts ago? The drivers on them look instanely big