williamneo

check for u if my brother wanna sell, will get him to sms u if he wants too.

me also opt for D1!

Black mind already set for akg701

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ops sorry.... wrong info... got to make a change.. thx heady you are right is 4700nf! dead meat i can't edit my previous post

lol yup it was a 50pcs bulk order.... didn't saw that.

Haha, what e hack sia.... farnell anyhow place the pricing.

Hi Sean! this is polypropylene type capacitor. The different is there is no (+) or (-) on it, u can use either direction.[attachmentid=3966]

This cap brought at SLS

was at farnell website looking thur some op-amp, happen to saw this chip AD797ANZ by analog devices. It Cost $599.19 for just 1 Pcs of this IC.... What darn expensive.... anyone has use this chip before? sorry for being sua ku.

[attachmentid=3965]

Bro add it here! btw your capacitor use wrongly wor for the 4.7uf (aka 470nf) should be Polypropylene type. which has no + or - Sign on the cap de. as for ur power supply there the smaller cap also wrong wor. The power supply there also polypropylene type not Electrolytic type. The bigger cap is correct. If let say your headphone compatible issue then might need to try out different gain. as you can see the 120k ohm resistor right. u can try change it to 90k ohm resistor. so the break down is....

1st add the R5 (100 Ohm) to remove the Hiss.

after the that u see if you are happy with it a not.

IF NOT.... then

change the caps and try listen to it, if everything is fine then leave it at it is.

if not carry on with the changing of the gain level by swaping the 120k ohm to 90k ohm.

After 1 day of listening to TL072, My final conclusion is, Opa 2227 is still better , for my point of view, Amplifier = Amplified the sound to a louder volume without much change of the original sound from the source. Both chip has good soundstage and detail. But when come to full knot of the volume the TL072 has a cut off somewhere at 3/4 full turn whereby opa2227 has not cut off till full turn. So in term of this I would prefer OPA2227 is a better chip then TL072. Just my 2Cent to share with you guy who has the intention to select chip among this 2.

I understand that most people will find OPA2227 is the best fit IC for CMOY.

But recently I try out this TL072 on CMOY circuit, seem that TL072 has a better detail and soundstage then OPA2227. Anyone out there has try TL072? Please give some comment.

Nice work,comy is a simple and best headamp.you can try many op.

Recently i have try the TL072, their sound so close... seem like TL072 has a slightly better detail and soundstage then opa2227. Anyone has any comment on this?

make sure ur gounding is connected properly, e.g pot ground, power gnd and source gnd is connected together. there is a kind of cable with both end is the same like ur headphone plug.

so far... look alright.

lol that pot diagram is i draft out last minutes when u ask.

give you one more in case you need it

[attachmentid=3964]

After you have successful build it please show me some picture ok so i can post online to show off your amp! Thanks

Thanks! I was just there. Only managed to find the JRC4556AD (not AL). Do you think this will be okay? As for the TLE 2426 virtual ground, I wasn't able to find it at all so I'm just going to use your other power supply schematic.

 

Could not find any Dayton caps. Wanted to buy online but minimum order is USD50!! Postage was estimated at about USD30.

 

So I'm just proceeding with what I found and hope for the best.

 

Coming back to the virtual ground circuit, there was a 220uf Capacitor. What is the voltage for this cap?

The 100k Dual Volume Pot I got has 6 legs!! Any pointers you can give on how I can connect it? In the diagram, it looks like they are all connected to the ground. Should I connect all 6 legs to the ground?

For the virtual ground cap use between 25v to 35v will do.

for the dual pot they have 6 leg mean 2 leg are the ground, 2 leg are the in and 2 leg are th out.

[attachmentid=3963]

Good Luck!

just finished building a cmoy based on williamneo's layout and tangent's circuit using for the tle2426..

 

for some reason everything sounds fine with the creative stock earphones & mylar x3i's, but when i use a pair of shure e3g's the sound starts have a lot of distortion & noise (the shures are working okay when plugged into other things).

 

any suggestions on what the problem might be? thanks in advance..

Try change the gain, i assume your current gain is 11 if you follow instruction base on my side and tengent side. For gain 11 is basically stable for the op-amp operation. For most headphone compatiblities try use gain at 5-6. so how to change the gain? Just change the R3 to 2k ohm will get you a gain 6. Good Luck! Hope this would help ya!

space electronic at basement on the right of battery shop, the uncle say they have JRC 4556 chip. Sean JRC and NJM are the same company.

Good Luck!

Sorry Feesh as for the Lm4562 i have never try it before so i am not sure how it work and the compatible of it. I actually have done up one more cmoy instruction you may one to take a look see if this could help? http://williamneo.blogspot.com/2008/03/mos...on-on-cmoy.html

Hi! feesh, Thanks for visiting my site tutorial! ur descripiton sound like ur capacitor somehow has short circuit or bad soldering connection. Don't rush to complete the work, take your time slowly solder your connection. (not too slow till burn ur component and stuff) but focus, alway position your circuit board in a way you feel comfortable and secure b4 u point your iron on it. Take care! and good luck!

lol so i can choice my own name for that cloner? that will be cool ya lol.

alamakazam, SLT currently no stock, but I think they have JRC 4560 $2 each.

another new post on Grado RA1 Headphone amplifier. Learn how to do it here!