'LIGHTWAH'

deadastronaut · July 18, 2011, 07:39:02 AM

no never had a heat problem on the tranny..

i put that 4.7k in there before the pot, as i did burn a pot out though when testing on bb.....but when i did that it was fine!...

deadastronaut · July 18, 2011, 10:39:54 AM

made some pcbs for it today!...

vendettav · July 18, 2011, 02:05:34 PM

looks great!
wish i could etch pcbs

nocentelli · July 18, 2011, 02:50:31 PM

Quote from: deadastronaut on July 18, 2011, 10:39:54 AM
made some pcbs for it today!...

You sellin'?

deadastronaut · July 20, 2011, 05:56:39 AM

guys : its too time consuming to be worth my while...cutting/printing/ironing/etching/drilling/tidying edges etc....
its quite a bit of work!...and i couldn't charge for my time too...if i did, they'd be quite pricey.... plus worldwide post etc...

anyhow:

try it on perf...which i have never tried..

or do a vero layout!...which would be bigger, but more accessible to everyone!...

JOHNO · July 20, 2011, 06:53:49 AM

Nice work on this Mr Rob, sounds cool. Just one thing though. There seems to be a problem with the schem, concerning the connections of the speed pot to IC2. In the schem R17 (150k) connects directly to pin 1 of IC2. But on the PCB layout R17 connects to pin 2 of IC2. And also the ground connection on the transistor is not shown on the schematic. It kind of made it a @#$%ing nightmare to do a working vero layout. Just thought i'd point it out to you. If you guys want to check out the vero you will find it at FSB.

deadastronaut · July 20, 2011, 07:09:23 AM

@johno:

hmmmm...which schematic?..

so you got it going then?...

p's i couldnt find your vero!.. $:-\$

JOHNO · July 20, 2011, 08:32:51 AM

I used the schem from page 15 drawn by you. There are two schems on that page and neither match up to the Pcb layout on page 17. And matt put up a schem on page 19 and it also does not match up with the layout. Maybe I'm missing something but i don't think so, I've checked the schems against the layout a million times.
I haven't built the vero yet. but it's a direct trace of your PCB (layed out differently though) so it should be ok.
I'm surprised you couldn't find the lay out, search for "Light wah"

deadastronaut · July 20, 2011, 08:46:36 AM

ok, i found the thread , but it wont let me see it as i'm not a member....and i can't be arsed with yet another password etc...

i'll dig around my files and see if i can get the verified scheme up ok!,.

p.s, dont use a tlo74!...high risk of ticking ok!.. already thought of that.......and the expression socket..........and envelope detector.....

in the end i kept it simple!...

JOHNO · July 20, 2011, 08:56:03 AM

Cool, can you check out the connections i'm talking about and let me know if i'm right or wrong. I think matt is having pcb's made and if he used the incorrect connections he is gonna be pissed.
I didn't use tl074's i used 072's, I hope it doesn't tick. I'll have to get around to building it.

deadastronaut · July 20, 2011, 08:58:52 AM

ok i'll have a look through it and make it more tidy etc....especially if matt is going for it...yeah he'll be well pissed off otherwise.....

there is no ticking on this at all.....no bloody 555 involved..

check back later ok.

deadastronaut · July 20, 2011, 09:39:26 AM

ok here ya go...this is the proper one i used...matt had a 10uf on the wah input...its not its a 4.7nf

BoxOfSnoo · July 20, 2011, 09:44:43 AM

Quote from: deadastronaut on July 20, 2011, 09:39:26 AM
ok here ya go...this is the proper one i used...matt had a 10uf on the wah input...its not its a 4.7nf

(old schematic goes here)

Isn't that a short between R11 and C7?

deadastronaut · July 20, 2011, 09:46:22 AM

yes!...

hold on ill sort it...

done!...

JOHNO · July 20, 2011, 09:55:50 AM

Thats better. I'm very surprised no one has brought this up earlier as I noticed it a couple of weeks ago. I guess nobody thought to compare the schem to the layout. Thank's for clearing it up rob. Perhaps the other schem's should be removed to avoid confusion.
If you look at matts schem you will notice he has the wrong connections on IC2 also and i guess on his Pcb, but i have not checked his Pcb. But i don't think it will work.

If someone could remind me how to add the layout I will post it up here. It's been a long time.

deadastronaut · July 20, 2011, 09:58:59 AM

no problem, hope its cleared it up for everyone...i'll remove what previous stuff i can ok..

matt will have to check in, to sort his out!...hope he hasn't gone ahead yet!!!...

edit: cleaned out old stuff ok...

mattthegamer463 · July 20, 2011, 11:23:39 AM

Hey guys,

I corrected my drawing, there appears to have been a number of components that have "appeared", or re-arranged themselves since I did my drawing based on the schem from page 15. Maybe we should clean up the obsolete schems before anyone else gets confused.

Here is the new one, it matches the new schem that is posted above.

I haven't ordered any boards, I don't intend to until I have 9 of them spoken for, and the tenth is for me. One guy is interested in "2-3" so there are lots floating around. I think $2 is a reasonable charge, plus postage to wherever you live. I think I can do padded envelopes for them in the standard mail, shouldn't be more than a couple dollars tops.

PM me with interest and I'll keep people updated here.

deadastronaut · July 20, 2011, 11:40:51 AM

looks ok,

only bits that looks a little weird is wah opamp should be pin 1 to C4...then THE 3.3K-6.8K..not after.

and speed pot should be reversed...3 2 1...

ive cleaned out the old schemo's etc...

mattthegamer463 · July 20, 2011, 11:48:05 AM

Quote from: deadastronaut on July 20, 2011, 11:40:51 AM
looks ok,

only bits that looks a little weird is wah opamp should be pin 1 to C4...then THE 3.3K-6.8K..not after.

and speed pot should be reversed...3 2 1...

ive cleaned out the old schemo's etc...

Corrected. I was rearranging stuff and a lead got stretched, made it look like it was mis-connected. It was actually fine. Anyway I fixed the above.

deadastronaut · July 20, 2011, 11:49:41 AM

cool.

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