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Old 16th May 2007, 12:28 AM   #21
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I don't know how to post 2 or 3 pistures at the same time.
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Old 16th May 2007, 12:31 AM   #22
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Combined
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Old 16th May 2007, 12:32 AM   #23
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And the pcb picture
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Old 16th May 2007, 05:50 PM   #24
Nrik is offline Nrik  Denmark
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Nice job, Iván
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Old 16th May 2007, 06:20 PM   #25
ssmith is offline ssmith  France
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Nrik,
Sorry to bother again, but just trying to think through what you said.
In other words, for the opamps in the filter stage, best to stick with something like the OPA2134, but for the output there is room for experimentation?
By the way, Rod also says that although he recommends the TL072 as "the most economical option... You may use any 8-pin dual opamp without concern" (throughout the board) -- the only caveat being that if using very fast opamps, the use of sockets could cause oscillation...

ivan: looks like nice work -- I'm a noob so I bought the PCB from Rod....
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Old 16th May 2007, 06:29 PM   #26
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Ivan!
Great work, what did you use to design it?
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Old 16th May 2007, 09:21 PM   #27
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Hi, guys

It's the first time that somebody apreciate my work, thank to everybody.
Well, because I'm novice in electronics, I use the "Express PCB" then use the PhotoPaint (corel) to improve the traces and finally to make the PCB, use Press'nPeel to transfer the picture to the copper. I have "Eagle" too, but to me is complicate.
If anybody need the hi-res pictures send me an e-mail.
Thaks to everybody
Iván Francisco
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Old 16th May 2007, 10:04 PM   #28
Fenris is offline Fenris  United States
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Quote:
Originally posted by ssmith

ivan: looks like nice work -- I'm a noob so I bought the PCB from Rod....
I'm using a pair of Rod's PCBs, but I get really bad hum on one channel. I'm not sure if it's my implementation or a design flaw.
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Old 17th May 2007, 08:49 AM   #29
Nrik is offline Nrik  Denmark
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Quote:
Originally posted by ssmith

In other words, for the opamps in the filter stage, best to stick with something like the OPA2134, but for the output there is room for experimentation?
You can use other opamps for the filterstage if you like. Just avoid the ones with bipolar input, like NE5532, LM833, etc.
But many people say that when used as a buffer like in this circuit, the benefit from very expensive opamps are not really that big.
So there is no need to buy the fastest most expensive video opamps you can find.

In my world the OPA2134 sounds great, and is pretty cheap, and I promise that you will get a great result using it anywhere in this circuit.

The output amplifier ( the one Elliot suggests as an add-on circuit with level-control - NOT the last opamp in the filtercircuit) can be anything. Here the it is okay to use NE5532 or LM833 or other bipolar input opamp, and here you can probably get better sound if you buy even better opamps like AD797, AD845 or THS4032 (watch out for the special feedback needed by the latter two and that these only come in SMD)...

But I'll just stick to OPA2134 or maybe OPA2604. There are some other threads in here that discusses wich opamps are best.
You can even substitute the whole output circuit with a discrete bufferamp with bipolars, FETS or tubes whatever you fancy - it is a regular bufferamplifier and not a part of the filter circuit itself.

Quote:
Originally posted by ssmith

By the way, Rod also says that although he recommends the TL072 as "the most economical option... You may use any 8-pin dual opamp without concern" (throughout the board) -- the only caveat being that if using very fast opamps, the use of sockets could cause oscillation...
TL072 is a very old opamp, OPA2134 is newer and sounds much better.
He is basically right about the oscillation thing, but nowadays the fastest video opamps only comes in SMD, so I dont think you'll experience any problems with regular DIP8 opamps.

My suggestion to use sockets was only if you felt like experimenting with different opamps.
If you just want it to work, just solder the opamps in the PCB without sockets (with OPA2134 ), put it in a box, forget about the opamps and just enjoy your music.
Or use sockets and you can change to a new opamp every week after reading on diyaudio.com about this f a n t a s t i c new opamp, spend all your time switching, listening and trying to determin wich one is the best...

I guess what I'm saying is....just use OPA2134 guys.
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Old 17th May 2007, 05:42 PM   #30
ssmith is offline ssmith  France
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nrik.
Once again. Huge thanks.
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