Generic Wah

[rocket88]

awesome, glad you got it working right and all it was, was a bad transistor.

[lucas abela]

keen to experiment with this

i looked up halp style inductor in small bear and brought one of these

http://smallbear-electronics.mybigcommerce.com/eleca-halo-inductor/

it arrived and has 8 lugs while the vero layout has only 4 connection points

did i get the wrong thing or am i just missing something?

[rocket88]

What you need to remember is that the inductor only has 2 actual connection points, the rest are simply to anchor it to the board for more support. On the board I show 4 connections, 2 that are part of the circuit, 2 that are for support. You should be able to remove all but the 2 you need. One thing I can tell you about that inductor, I bought one once and it never worked. I ended up replacing it with another type and the wah worked perfectly. I love smallbear, and Steve as he's really helpful and has a lot of parts that can be hard to find, but I'm not a fan of their inductors and ended up having to throw it out as they claimed it was fine and passed every diagnostic test they had me do on it. But like I said once I changed inductors nothing else if worked no issues.

[lucas abela]

ok i take it the two points that share continuity on the MM are the ones i need to connect to teh two different points on the PCB and tehre is no polarity?

[Silver Blues]

Yeah that sounds right. An inductor has no polarity.

[lucas abela]

ok so i can't seam to find the RW on this layout?

am i missing something?

[lucas abela]

also this halo style inductor i got from smallbear has a metal covering that comes out on the bottom do i need to ground this?

[lucas abela]

im using the boomerang parts but being a newbie wanted to check some of the * points

*1 says that cin comes before rin dose that mean i should swap these parts over

*2 says there is a 620k resistor between the C and B of Q2 instead of rc2, dose tat mean i put a 620k resistor between row 4 and 5 on column 11 ?

[rocket88]

The top shouldn't have to be grounded, at least to my knowledge that is. I'll McKee another layout for you for the boomerang, as adding that resistor between c-b won't really work to well.

[rocket88]

New layout for you, specifically for the boomerang. i also show only 2 connections for the inductor to alleviate confusion about where/how to mount it.

[lucas abela]

thankyou so much this is awesome

[rocket88]

anytime buddy. enjoy and good luck on the build. keep me updated as to how it works out and if you have any issues.

[lucas abela]

will do had to start from scratch but going well still unsure where to put or what to do with RW?

[rocket88]

Rw is your wah pot.

[Sl8v aka Slav]

hi, rocket88
I also on my way to make Boomerang clone. I'm trying  to adapt Joe Gagan's take of Boomerang - Faux Boomer - from this thread http://www.madbeanpedals.com/forum/index.php?topic=20166.0
He suggests transistors in the certain hfe range, so i guess that is why resistor values are a bit different. Also he omits Re1 (like in Colorsound Wah) and use 3-4  trimmers including 250k on input (right?). So, for that version, i guess we can replace jumper from 620k resistor with value to get 930k in total.  And add more raws to create custom value of Cf capacitor (he uses 3 in parallel in his builds). I've ordered wah pot from him directly and got some more tips to building process, so will report my results soon. Thanks for time-saving vero.

[rocket88]

correct, the colorsound wah has the emitter of q1 directly to ground. the differences in some of the values is not just about transistor bias, but by changing some of them you will change the character of the wah itself.

joe is an awesome guy, and i make all my wahs with his tonetank, and will only use them. they sound amazing, and every one he's made specifically for my to the inductance i want.

anyway i digress. i took a look at the link you posted, and took a look at the schematic he posted. if you're going to make it like his you're going to replace Re1 with a jumper.replace Rin with a 250k trimmer, Rc1 with a 50k trimmer, and he also has a 100k trimmer inline with Cin and adds a 1nF parallel with Cin and 100k trimmer.

[Sl8v aka Slav]

I think 250k is not Rin, it goes to ground. 100k trimmer is rather Rin. Anyway...

[rocket88]

i took a look at the schematic again, and the 250k trimmer is Rin. a trimmer is like a pot, it has 3 legs. leg 1 is connected to the input, leg 2 go into the circuit, and leg 3 to ground. what its doing is controlling how much signal goes into the effect. the 100k trimmer is controlling how much signal goes into the 47nF cap into Q1.

[Sl8v aka Slav]

thanks for clarification, Rocket88. will start to build just after sorting tayda package

btw, i've compared values with Paul Marossy's BG1 schematic from Y2006: he uses Rin = 68k, all other values equal to those in table. Thus Rin will definitely be a trimmer.

[rocket88]

anytime man, hope it works out well. if you need any help, you know where i am to help.