Light wah layout

JOHNO · Post by **JOHNO** » 12 Jul 2011, 16:41

Yay, lets build one. Layout NOT VERIFIED. Give me a day or two so i can go over it a bit more, clean it up and build one. I did some "stupid layout tricks" just to confuse you.

Also i will redraw the schem and post it up here too.

Light wah.png

Hmmm can't post the link to DIYSB ,anyway ya can check it out there if ya like.

the band · Post by **the band** » 12 Jul 2011, 22:16

JOHNO wrote:Yay, lets build one. Layout NOT VERIFIED. Give me a day or two so i can go over it a bit more, clean it up and build one. I did some "stupid layout tricks" just to confuse you. Also i will redraw the schem and post it up here too.
Light wah.png
Hmmm can't post the link to DIYSB ,anyway ya can check it out there if ya like.

doesn`t work? should do though: https://www.diystompboxes.com/smfforum/ ... ic=88582.0 verified on page 17 there: http://dl.dropbox.com/u/7464107/lightwah%20layout.pdf

JOHNO · Post by **JOHNO** » 13 Jul 2011, 02:55

the band wrote:doesn`t work? should do though: https://www.diystompboxes.com/smfforum/i ... ic=88582.0 verified on page 17 there: http://dl.dropbox.com/u/7464107/lightwah%20layout.pdf

I'ts just that i'm too stupid to post a link.

JOHNO · Post by **JOHNO** » 13 Jul 2011, 04:03

I'm not sure if i have the wrong schem or if there is a mistake on roberts pcb layout. there are two things that are not matching up.
First up, Pin 2 of the lfo goes to 1m/R15 and back to pin 1 but continues on to connect to 6k8/R16 then into the speed pot, across 150k/R17 and back into pin 1. But on the pcb layout 150k/R17 connects to pin 2 not pin 1. I don't know if this will have any effect but it doesn't match the schem.
And secondly, The transistor in the Dark/light section,looking at the schem, +9v is connected to the sensitivity pot which feeds the base of the transistor. The collector is connected to two leds in series then back to +9v. So far so good, this bit matches up with roberts layout. But on the schem the emmiter is connected to the foot ldr then back to the base. But on the pcb layout the emmiter is going to ground. Anyway, fuck this bullshit i cant even explain what the fuck is going on let alone sort it out so i give up. If anyone else wants to continue on with the layout ,feel free.

JOHNO · Post by **JOHNO** » 13 Jul 2011, 06:27

Ok I feel better now, i've blown off some steam smashed a few things up and calmed down.

JOHNO wrote:And secondly, The transistor in the Dark/light section,looking at the schem, +9v is connected to the sensitivity pot which feeds the base of the transistor. The collector is connected to two leds in series then back to +9v. So far so good, this bit matches up with roberts layout. But on the schem the emmiter is connected to the foot ldr then back to the base. But on the pcb layout the emmiter is going to ground.

Ok i've got this bit sorted out. The emitter is supposed to go to ground.
Anyone got any idea whats going on with the lfo section?
I can't download the stupid schem amarndo has put in the gallery at DIYSB. Why the fuck cant they just post the schem up where everyone can see it. There are schem's posted in the thread but they don't match the layout. I'm starting to lose it again.

JOHNO · Post by **JOHNO** » 15 Jul 2011, 08:08

Why do i get the feeling im talking to myself?

Nevermind.

Here is what i've got now. It's still NOT VERIFIED. Its a bit large but i want one and i like big boxes.

As i said earlier the schem and the layout don't match up so i used the layout to make the connections on this layout. Does that even make sense? Oh well, hear it is.

Light wah.png

Nocentelli · Post by **Nocentelli** » 16 Jul 2011, 15:04

nice one, johno, i've been following the thread for this at diysb for a while -the most recent demo is just great and i'm ordering parts!. i was thinking about a few extra features (uh-oh!): Firstly having a extra switching streo jack for an expression pedal that defeats the foot-wah LDR (maybe a bit pointless), secondly having an envelope detection circuit to give a third control mode (maybe too much hassle). if i end up re-doing a layout to accommodate these extras, i was thing about using a quad opamp instead of the two TL072s - is there any problem with this idea in principle? i have no idea about noise, ticking potential.

JOHNO · Post by **JOHNO** » 16 Jul 2011, 15:39

Nocentelli wrote:nice one, johno, i've been following the thread for this at diysb for a while -the most recent demo is just great and i'm ordering parts!. i was thinking about a few extra features (uh-oh!): Firstly having a extra switching streo jack for an expression pedal that defeats the foot-wah LDR (maybe a bit pointless), secondly having an envelope detection circuit to give a third control mode (maybe too much hassle). if i end up re-doing a layout to accommodate these extras, i was thing about using a quad opamp instead of the two TL072s - is there any problem with this idea in principle? i have no idea about noise, ticking potential.

I've been following the thread too, and yes i agree the demo of the circuit does sound good. I think i might make one with just the foot wah section and drop the lfo.
I can't help you with your other questions.

ballfire · Post by **ballfire** » 22 Jul 2011, 10:18

use the schematic with a opamp lfo not the ic timer on lfo..it ticks

Nocentelli · Post by **Nocentelli** » 27 Jul 2011, 19:33

Johno - Have you verified your layout yet? I quite like stripboard, and might well have a go.

While waiting for dozens of LDRs to arrive, I re-did the verified perfboard layout posted by deadastronaut himself at DIYSB - The only thing I've done to it is put in some coloured traces so I could make sense of the schematic, allow me to build the sections separately to verify they're working bit-by-bit, and to help out with debugging should it not work first time:

Lightwah_deadastronaut_perf layout.gif

Nocentelli · Post by **Nocentelli** » 27 Jul 2011, 20:43

edit - removed erroneous implied +9v connection to L20:

Nocentelli · Post by **Nocentelli** » 28 Jul 2011, 14:14

askwho69 wrote:
Nocentelli wrote:nice one, johno, i've been following the thread for this at diysb for a while -the most recent demo is just great and i'm ordering parts!. i was thinking about a few extra features (uh-oh!): Firstly having a extra switching streo jack for an expression pedal that defeats the foot-wah LDR (maybe a bit pointless), secondly having an envelope detection circuit to give a third control mode (maybe too much hassle). if i end up re-doing a layout to accommodate these extras, i was thing about using a quad opamp instead of the two TL072s - is there any problem with this idea in principle? i have no idea about noise, ticking potential.

this is good idea please share some if you're done, im also following the thread on DIYSTBX!
:::)))))

I'm going to build the straight-forward, deadastronaut version first, then may try adding other sections as neccessary: Stay tuned (I'll post at DIYSB, too).

JOHNO · Post by **JOHNO** » 29 Jul 2011, 03:37

Nocentelli wrote:Johno - Have you verified your layout yet? I quite like stripboard, and might well have a go.

No i have not verified it yet.
I had a brain meltdown and removed all my layouts from the board. Seem like no one is interested in building pedals just interested in pedal politics.

Dr Tony Balls · Post by **Dr Tony Balls** » 29 Jul 2011, 13:41

I'm definitely interested in this (and have been) but i'm a few weeks behind you. Ive had plans for building his circuit but wanted to breadboard it first and make sure I liked everything, and didnt need to tweak.

Nocentelli · Post by **Nocentelli** » 30 Jul 2011, 06:43

Johno - Don't lose heart, people will be building DIY stomps long after Freekishgate, Retrogate, JHSgate etc have been forgotten: Thanks again for your vero layout.

Dr Tony (if indeed you are a qualified medical practioner) - Good news, always nice to have someone else to compare notes with; i haven't yet received my parts order and have a busy weekend ahead, won't be breadboarding til next week. i might just wire up that perf layout i posted as a test bed, and socket all LDRs and LEDs to test out different combinations, and maybe socket the caps in the in/output and filter sections to tweak the response. I'm also semi-tempted to try out vactrols, especially if I end up making a couple of these... might even try etching boards for this one.....

i'm slightly suprised by the (seeming) lack of interest in this project - i love the idea of a "virtual" footwah - maybe it's the holidays, maybe people are transfixed by the legal nonsense going on, maybe everyone already has a wah?

greenskull · Post by **greenskull** » 30 Jul 2011, 07:07

Please don't give up, I'm in the middle of a build frenzy as of late and this one has certainly made it on my "to do" list! I've been eyeballing this thread, but lurking around here mostly as I expect most others are doing as well.

JOHNO · Post by **JOHNO** » 30 Jul 2011, 07:08

If you guys are going to build this be sure to use ultra bright leds. I had just the wah section on the bb with standard leds and there wasn't much range in the sweep. It wasn't bright enough at the max sweep. Also i found the foot lrd was kind of a pain to use. It is basically full on or full off which is ok for crazy metal solos but for slow sweeping wah riffs it's not that great. It might have something to do with the type lrd used in the circuit, i used cheap ones from jaycar. But you can use the wah with the shadow of your head or the neck of your guitar or even by pushing the bass player around the studio (my favorite).

Light wah.png

Dr Tony Balls · Post by **Dr Tony Balls** » 29 Aug 2011, 14:34

Man does anyone have the schematic for this that they can confirm WORKS? Ive got two drawn from different people that match but I cannot get the LFO to do anything at all. Breadboarded twice and checked all my parts and all I can get is an LED that says on constantly instead of pulse.

Nocentelli · Post by **Nocentelli** » 29 Aug 2011, 19:26

I used this one, and it worked fine on the breadboard: I'm pretty sure it's good.

I couldn't get my perf layout to work, so tried doing a vero... FAIL AGAIN. Oh well, i'll get this working in a box one day.

JOHNO · Post by **JOHNO** » 30 Aug 2011, 03:06

Nocentelli wrote:so tried doing a vero... FAIL AGAIN.

Did you use my layout?