[aphexii]

Quote:

Originally Posted by infinitesymphony /img/forum/go_quote.gif The datasheet for OPA2227 says that the operating range is 2.5 to 18.0 V, so it doesn't appear to be a picky op-amp regarding voltage. Some people believe more power is better even for op-amps like these, but since it's not picky, there is not likely to be a significant audible difference, though there will be a difference in battery life.

I appreciate the help, thanks!

One more newb question, if I decide not to use the optional R5 resistors, do I have to just use a plain jumper in that spot? Or can I leave it empty?

 

[infinitesymphony]

Quote:

Originally Posted by aphexii /img/forum/go_quote.gif One more newb question, if I decide not to use the optional R5 resistors, do I have to just use a plain jumper in that spot? Or can I leave it empty?

Something must be bridging those connections, otherwise the circuit won't be completed. Use a jumper.

 

[aphexii]

Quote:

Originally Posted by infinitesymphony /img/forum/go_quote.gif Something must be bridging those connections, otherwise the circuit won't be completed. Use a jumper.

Gotcha thanks.

One more newb question if I may. Between the positive and negative battery strap soldering pads (directly below the 8 pin dip) is a smaller hole. Do I just solder a straight small jumper in there? (almost like a plug?)

LINK

 

[infinitesymphony]

I can't remember what Josh said that was for, but yes, as far as I remember I just soldered in a jumper and nipped off the ends on both sides, which is what seems to be going on in that picture.

 

[funch]

AFAIK it's just a pass-through from one side of the board to the other. I built 5 amps using Josh's boards and didn't do a thing with that hole, and they all worked fine.

 

[aphexii]

Whew! All done! Thanks for the help guys!

I am not doing too well putting this thing into a tin though, even using a template I'm having a heck of a time getting the holes properly sized and lined up properly.

I'm really considering getting that tiny Hammond case (~$13) and getting a custom Front Panel Express, which came out to ~ $16 plus shipping. Around $30 total, might not be a bad solution for me as the case is killing me

 

[Joshatdot]

Dang it's been busy here last few days!

Sorry I didn't answer the questions myself, I was working & went to my grandpa's 90th b-day.

I've wanted to do a PFX for a Hammond case, but I got impatient with its program and didn't design.

What problems are you having with mint tin case?

 

[aphexii]

Quote:

Originally Posted by Joshatdot /img/forum/go_quote.gif Dang it's been busy here last few days! Sorry I didn't answer the questions myself, I was working & went to my grandpa's 90th b-day. I've wanted to do a PFX for a Hammond case, but I got impatient with its program and didn't design. What problems are you having with mint tin case?

No prob. I think my paper punch just sucks, it almost had me crying like a little girl trying to break through both an altoids tin and the zippo tin I wanted to try. I eventually make it through, but its not turning out so well as I had to push so hard it started to disfigure the tin

Then i tried punching the line outs and it went down from there. Just so hard to make it through, the punch slipped to the side a bit and now the holes don't line up...

I actually got the design of the PFX done I think, just trying to decide if i want to spend the $30 on the case total (PFX + Enclosure). Though, the idea of a black enclosure with black fill letters just makes me smile

I have to say though, I'm kinda amazed I got this thing to work on the first try. Sounds GREAT! I'm using a single 9v, vishay's, 2227, white LED. Though right now, i'm enjoying it as it sits on a antistatic bag

Great job on the PCB btw, really helps out the newbs such as myself! THANKS!

EDIT: Just had an idea. My dad is big into woodworking, wonder if he could craft a small wooden case for me. Hmmmm.

 

[Joshatdot]

That would be cool..it would be like a RA clone

 

[Sotiris]

has anyone used 2 opa134pa? i have them and i have problem with the virtual ground.the volts before connecting the opa's is 4,5 and 4,5 at the capacitors.but when i connect them it falls to 7 volts and 1.i dont use TLE2426 but the classic resistors and capacitors.so the soun is heavily distorted.

 

[fortney]

A CMoy in a Hammond case, etc. would look very nice. The main virtues of the Altoids tin is that it is cheap and once was unusual...

I mounted mine in a plastic polycarbonate case and have been happy with it that way.

F

 

[bidoux]

Where can I get this Cmoy board ?

 

[Joshatdot]

Quote:

Originally Posted by bidoux /img/forum/go_quote.gif Where can I get this Cmoy board ?

here http://www.head-fi.org/forums/f42/fs...boards-253920/

 

[aphexii]

So the Unibit seems to be working great for poking holes, I just need to figure out how to line everything up perfectly so the holes are in the right places.

Maybe a sheet of paper?

 

[diredesire]

Quote:

Originally Posted by aphexii /img/forum/go_quote.gif No prob. I think my paper punch just sucks, it almost had me crying like a little girl trying to break through both an altoids tin and the zippo tin I wanted to try. I eventually make it through, but its not turning out so well as I had to push so hard it started to disfigure the tin Then i tried punching the line outs and it went down from there. Just so hard to make it through, the punch slipped to the side a bit and now the holes don't line up... I actually got the design of the PFX done I think, just trying to decide if i want to spend the $30 on the case total (PFX + Enclosure). Though, the idea of a black enclosure with black fill letters just makes me smile I have to say though, I'm kinda amazed I got this thing to work on the first try. Sounds GREAT! I'm using a single 9v, vishay's, 2227, white LED. Though right now, i'm enjoying it as it sits on a antistatic bag Great job on the PCB btw, really helps out the newbs such as myself! THANKS! EDIT: Just had an idea. My dad is big into woodworking, wonder if he could craft a small wooden case for me. Hmmmm.

You may want to move the amp to something other than an anti static bag

They're conductive AFAIK.