dreamie

Looks reasonable..  I hope your R2 isn't 100k since you opted for using ~0.1uF signal caps.  Try 220k/ 470k instead.

 

4-pin DIP socket?  That's interesting..

Hmm.. how would the R2 value staying at 100k affect the overall circuit? Thanks in advance for the forthcoming enlightenment.

Read the META42 article on the signal cap value and u'd know why.. I'm not about to spoonfeed ya.

It's in the original META webby I suppose? It's late.. i'll search tmr. Thanks.. seems like there's still hope..

Completed my CMOY. It sounds like a MALFUNCTIONING RADIO WITH EXTREMELY BAD RECEPTION!!! Lots of static like sound... Tried it on a headphone for a few seconds but my ears begged for mercy so i used it as a preamp and I could hear it more clearly on the speakers alot of static like noise. Could it be because of the PIO? Old caps sound like old radio...

My previous CMOYs without any caps didnt sound this bad!!

I'm gonna scrap the PIO... gonna save me alot of board space. Are the Evox Rifa caps any good?

AHHH... MY WEEKENDS WASTED!!

Why don't you read the datasheet? The info are all there if you put a little effort to go thru it. And the best thing is you'll learn something more from the datasheet.

 

From Datasheet, the TLE2426 max current out is +- 80ma

 

Max output from Burr Brown's OPA like the 2132 or 2604 (from memory) is about +- 35ma... TLE2426 is more than enough, coz more than often the OPA don't reach to 35ma, unless you're driving low impedance headphone like the Grado.

 

You're doing a Cmoy right? So I assume you'll be usingn just one opamps without buffer.

Guess I was too carried away to forget to read the datasheet.. my apologies...

Hmm... then I suppose I can use the TLE2426 to power a pair of opamps after all.

Thanks for your enlightenment.

they draw next to nothing on idle.

 

they can draw quite abit depending on the load.

Thanks for your input.

Any idea how much it draws for the worse condition? Thanks.

I guess i will settle with a simple voltage divider as per Cmoy schematic. The PIO caps are taking up almost half of an Altoids tin can. Oh yea, I got an Altoids tin can, found it somewhere in the house.

Hmm.. after looking at it carefully seems like it wont work...

Any idea how much current these opamps draw? TIA.

Did up something...

http://www.villagephotos.com/image.asp?id_...256&sessionkey=

Compared with the PPA supply, this has shared ground (not sure if PPA is sharing ground) and lacks a few transistors to attenuate the noise (right?).

Would this work? Thanks.

(never used villagephotos b4. if pic doesnt show, try: http://www.villagephotos.com/browse.asp?selected=820071 )

Hmm... have some questions regarding the TLE2426. I'm afraid it can't supply enough current to the opamp. (most probably OPA627, 637 or AD8610) Are there any solutions to it? Tangent audio mentioned BUF634, but that's gonna eat into precious real estate. The PIO caps have already claimed owner on a large plot on land...

Looks reasonable.. I hope your R2 isn't 100k since you opted for using ~0.1uF signal caps. Try 220k/ 470k instead.

 

4-pin DIP socket? That's interesting..

Hmm.. how would the R2 value staying at 100k affect the overall circuit? Thanks in advance for the forthcoming enlightenment.

R5 is optional, but is it good to have one? Thanks once again.

Got that socket from Koba. It is inside the bag of normal sockets... just gotta look hard enough.

Elvis fine.

IMHO, Sponge Bob just look gay!

 

dreamie hope no offence taken.

I think so too.

Anyone got surplus of that Pengiun mint?

Hi everyone.

I would like to view the schematics of some CMOY amp variations, could some kind soul put it here? THank you!

I have acquired the following components for the project.

2* Matsush*ta (Panasonic) LXF series 680uF 16V capacitor.

4* 0.068uF Nichicon 'Paper-in-oil' (PIO) capacitor.

8* 1% metal film resistors.

1* 5% carbon resistor.

2* 3.5mm socket.

2* 4-pin DIP IC socket (Made by Texas Instruments... patented. )

Anything I left out?

I plan to parallel 2 of the PIO caps to get closer to the 0.1uF. Takes up alot of real estate, but it is PIO.

Planning to use the TLE2426 virtual ground driver to obtain ground reference, instead of using a voltage divider ala CMOY style.

Please advise. Thanks a million!

Any Elvis fans? And for Sponge Bob fans, you know who you are!

I want the Sponge Bob one.

Can someone help me buy? I don't have a CC to qualify for a eBay account. Thanks. I probably only need 2 of the 6, but will take all if there are no other takers.

Thanks in advance.

can get some idea of the size difference from this pic, its only a little longer then the Altoids

 

its actually a better choice if u r using 2 batts

Thanks. Seems like only the Hudson and that chinese sweet is available in Singapore.

You got any of them up for sale/giveaway?

i was looking for those strepsils tins before i found the Altoids now all the strepsils come in plastic packings

Everything comes in non-recycleable (a.k.a. use-and-dispose) package nowadays.

Just saw the Hudson at 7-11 for $3.08. Seems a bit 'long', which makes it look kinda improportional. Any comments on this tin can?

Thanks for all your inputs.

Guess it isnt easy to get tin cans in Singapore.

Just saw the Dilbert tins...

Any place I can get the tins locally? Thanks.

Have scoured through the last 4 page but found nothing related to it, only a comment by Firefox stating 7-11 and Guardian retailing Altoids, but it is followed by a comment which says the Altoids cant be found at 7-11.

As so, I would really appreciate it if someone would tell me where to get it. Thanks in advance.

I don't really like the Hudsons. Prefer the Altoids and the Penguin with the striking background.

Thanks once again!

I know that there are a lot of cases of the megaworks blowing their fuses and having blown their subs... might be an indication of shabby construction. I have no idea for gigaworks. Its a very new product.

 

At that price papaya, get the klipsch 5.1 speakers.

I'm a happy user of the megaworks, no blown subs...

Francis' Megaworks blew after a few days of blasting.

is there a stereo equivilant of the 627?

There's only a single version of the 627, sad to say.

Confirm its power output stage is MOS FET K214/J77.

The tubes are for input and voltage amplification,

and "current driving stage"?

(sorry, hopefully you guy/gal know what I am talking,

correct me if I am wrong)

 

What tubes? let me pull out the whole thing and see.

Need to de-solder some connections.

 

How does it sound? good question,

This is the one thousand and one headamp I have,

The only thing I can say is......

I have nothing to compare.

I supposed the tubes work as a buffer?

no OPA627s

but i still prefer the AD8610s...

btw Ruach, i'm w00t from echoloft.

if im correct, the terratec uses the same chip as the revo..

the chip that addresses the PCI bus (Envy24) is the same. but the DAC and stuff may not be.

I thought you read the thread

 

basically, just replace everything labeled "buffer" or "filter" in the picture. if you want to do all 8 channels that is.

for the front two, just the buffers and filters in the top right hand corner of the pic lah

oo.. so only have to replace 3... thanks.

hey, if you got a better method, by all means go ahead man.

 

did you search the forum?

did you read my past thread?

http://www.sgheadphones.com/index.php?show...pic=616&hl=revo

the very FIRST post has all the instructions!

still quite blur on what to do...

I hope you read the entire thread where I did the mod.

 

desolder: use soldering wick to suck up all the solder and pry the opamp off the board lah

wah.. this kinda desodler method ah...

i rather use hot air gun.. but afraid the other smt stuff ard the opamp falls off leh..

btw, i read finish whole thread still no idea which are the opamps to change..... or shld i change all

thx again. may replace all the output caps with blackgates when i have the moola

bump