Here is what some people want

Marcos - Munky · September 03, 2003, 03:55:18 PM

The Woody layout is finally online. Thanks to Tomboy for redraw the layout, he did a great job. If anyone find anyerrors in the layout, tell me, then I will correct.

jsleep · September 03, 2003, 04:11:24 PM

Hate to be picky, but could we get that with a modern quad opamp pinout (TL074)?

Jeesh, I just looked a gift horse in the mouth.

Sorry,
JD

Marcos - Munky · September 03, 2003, 05:16:09 PM

No problem. Could you tell me what is the pins that I need to change to convert it to a TL074, then I can try to draw another layout.

BILLYL · September 03, 2003, 06:27:12 PM

Munk-

Thanks to you and Tomboy for a great job. If you like I can make a ExpressPCB version if you like.

Thanks

BILLYL

:shock:

Aharon · September 03, 2003, 08:33:17 PM

Ok,pardon my ignorance but how do I make a board out of the basically black and grey image I get on the screen,comes out with parts and everything.
Thanks for the job,well done.
Aharon

SoundTech · September 03, 2003, 10:34:37 PM

The JPG image is just the layout of the whole board with components. I think you need what's in the ZIP file, but I don't have Eagle on my machine, so I'm not sure.

Marcos - Munky · September 04, 2003, 11:45:41 AM

Hey Billy, fell free to do your version. I think this will make more people happy. Aharon, you could erase the parts in some image software, but it's a hard and boring work.

Thomas P. · September 04, 2003, 01:14:24 PM

Quote from: AharonOk,pardon my ignorance but how do I make a board out of the basically black and grey image I get on the screen,comes out with parts and everything.
Thanks for the job,well done.
Aharon

For best print results download it on EAGLE download. It's free and they have a version for LINUX, too

Regards,
tomboy

jsleep · September 04, 2003, 03:27:30 PM

Hi Tomboy,

How have you been?

http://anela.mtk.nao.ac.jp/messia3/cic/datasheet/tl074.pdf

Page 2 top right-hand corner is the DIP TL074 pinout. This is the standard pinout for 90% of the quads available now-a-days, so it will give us a lot of opamp options!

Thanks!
JD

jsleep · September 04, 2003, 03:29:14 PM

Whoops, that last post by me was meant for Munky.

Thanks,
JD

Aharon · September 04, 2003, 05:48:14 PM

For those that wanted a clearer positive image of the PCB(including me)if you stick it in Paint and use the Invert Colour option the background will become white and the traces will remain gray.Easier to make a board that way.
Aharon

Marcos - Munky · September 04, 2003, 09:50:41 PM

Hey JD, do you have the LM4136 datasheet?

Paul Perry (Frostwave) · September 04, 2003, 10:03:35 PM

The LM4136 data sheet (and many others) appears to be at the Jaycar site:
http://www1.jaycar.com.au/semiconductor.asp

Jaycar are an Australian parts supply company. With some guitar fx kits, but the stuff here is better!

Marcos - Munky · September 05, 2003, 11:36:26 AM

Thanks. I will take a look and try to draw a new version.

Aharon · September 05, 2003, 01:04:37 PM

Hey Munky,isn't there a connection missing from the trim/diodes to pin 10 of the 4136?.
Regards
Aharon

Bill Bergman · September 05, 2003, 02:20:53 PM

I've got one populated and ready to solder except for the 39nf caps and the "small pf" caps. How small is small and does it matter if the 39nf's are ceramic or metal film. I have 39nf ceramics and 33nf metal film. Is 39nf critical or would 33nf be OK?

oops...... I meant mylar caps not metal film :oops:

Marcos - Munky · September 05, 2003, 02:48:34 PM

Thanks, Aharon. I corrected the layout. About the small pf caps, Mark said that a cap in a small pf value could reduce some noise. You need to try with both to see what sounds best. I don't remember very well, but I think Mark said that he used 220pf.

Bill Bergman · September 05, 2003, 06:30:47 PM

Would a 200pf and a 250pf be ok for the "small pf caps" ? I don't have 2 of the same value.

Marcos - Munky · September 06, 2003, 01:17:33 AM

I think it's a good value. You need to try to see how it sounds.

Mark Hammer · September 06, 2003, 10:01:09 AM

I'd have responded to your question sooner but my modem crapped out on me and I had to run out and buy a new one last night in between all the other errands.

The feedback cap in the input and output stages is just to keep the noise from getting unreasonable. Just about anything that yields roughly 15khz bandwidth is fine. I say this because some people may choose to change the feedback resistor value either because iut's all they have in their parts box or because they need more, or less, output. For instance, using a 470pf cap with a 22k feedback resistor in the output stage would get you a rolloff starting around 15.3khz. This will take off a bit of the upper top end hiss but still leave plenty of siuzzle. You can raise of lower than rolloff according to taste and need.

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Here is what some people want