BJF Lil Green Wonder - or is it??

[HamishR]

Chuck so far so good no leaks. But you've got me worried now... I'll use a fresh gasket next time I open it up. It's more letting the smoke out I'm worried about.

Hey phi1 - You got me thinking more about C5... So I did some more experimenting, wondering if there was a compromise which would suit both situations and I think there is. Changing C5 just a little bit makes a huge difference to how the pedal sounds. From what I've been told it seems that the bigger C5 is, the more the low end creeps into the midrange in that crucial area around 7-800Hz. Well I don't know where am I am frequency-wise but I had found 100nF to be too much for the Gretsch and 47nF too little for the Les Paul (although it did sound pretty good). But it seems that 82nF for C5 works beautifully with both guitars. In fact I think it sounds best of all the options I tried. So here is an updated schematic if anyone is interested - It may not work as well with your rig but it sounds great with mine. It also cleans up surprisingly well with the Gretsch's volume control (which has a treble bleed on it).

 

[phi1]

Right on, experimenting is what it’s all about.

If you’re ever curious where you are frequency wise, you can use F=1/(2*pi*R*C) where R is R7. F is the frequency below which lows start to be attenuated (it’s not a complete cut). You can use an RC filter calculator website to do it easier (it’s the same equation for this as a LPF RC filter).

Of course, crunching numbers is no substitute for using your ears as you well know!

 

[HamishR]

At the risk of wearing out my welcome... After talking with Chuck he convinced me this could get even simpler while still sounding the same. He's right. Really annoying - he's almost always right.

So here is the schematic for my latest version and I dare say my last. This is a simply great all-round OD for me and particularly amazing with a Gretsch with Filter'trons. And as a minimalist at heart I love simpler.

 

[HamishR]

And pics of the new version. I may change the knobs because it's all a bit lairy for me! But it's a cool look.



View attachment 7217

 

[cooder]

Looks great, thanks for sharing, might have to give this a try as well!

 

[Chuck D. Bones]

Looks great! The schematic is a LOT like a Timmy at this point. Just a little different tuning on the BASS & TREBLE controls. Last stage could be wired for some gain, but I'm sure it's plenty loud as-is.

The schematic shows the TREBLE control wired backwards. Resistance should be minimum at full CW.

 

[HamishR]

That's interesting - I'll have another look at the Timmy schematic. Thing is this sounds a fair bit more aggressive than a Timmy. I even built a Timmy III recently with the same clipping diode combo as I have here and while it sounded better to me than the original Timmy it's still quite polite compared to the Gringo, as I am now calling this circuit. And yeah - with gain and volume at around noon it's just above unity volume-wise.

 

[cooder]

Looks great! The schematic is a LOT like a Timmy at this point. Just a little different tuning on the BASS & TREBLE controls. Last stage could be wired for some gain, but I'm sure it's plenty loud as-is.

The schematic shows the TREBLE control wired backwards. Resistance should be minimum at full CW.

How would you suggest to wire/change the last stage for more gain?
Add a resistor in feedback loop of op amp stage?

 

[Chuck D. Bones]

Just copy the Timmy's 2nd stage for a 6dB boost. If you go any higher, you risk saturating the 2nd stage.

 

[cooder]

Cheers Chuck!

 

[HamishR]

I discovered that I showed the treble control wired backwards when I built it and found that I had wired the treble pot backwards. I thought I had updated the schematic but obviously not. But hey - the pedal looks cool! And the interior pic seems to have disappeared.

 

[HamishR]

updated schematic with treble pot the right way around:

 

[cooder]

Awesome thanks might have to give that a try too! Thanks for sharing!
Vero build looks superb!

 

[HamishR]

If it helps here is my Vero layout.

 

[cooder]

Thanks but my vero would look horrible... I'm enjoying at the moment Diptrace, might whip up a board that way. Cheers again!

 

[HamishR]

Ha! Well there you go - I can't make up a PCB. But I can do Vero.

 

[ADAOCE]

If it helps here is my Vero layout.

View attachment 7253

Thanks!!