BLACK FOREST High Gain Preamp - Based on the Bogner Uberschall

[deadastronaut]

if it works , do it...!..very cool.   ....now make it adjustable?


me too on the hosting btw..

[J0K3RX]

if it works , do it...!..very cool.  ....now make it adjustable?


me too on the hosting btw..

I thought about making it adjustable but it works real good in both boost and normal modes, doesn't clip off the notes or decay, even if I roll my vol on my guitar back so...
I put a 500k pot in place of the 330k resistor and it works but if you switch off the gate it's still affecting that resistor which makes it sound like doodoo in normal mode.. I suppose I could get all crazy and make it switch back to a fixed resistor 470k or 220k but I really don't want anymore knobs.. maybe a high/med/low gate? Confusing It work great I think so, unless somebody else wants to take it to the next level I am gonna just sit on it for now

I think the best way to make it adjustable is to replace the 1 meg resistor with a 1 meg pot! That would eliminate any problems when the gate is off since that is bypassed...This is a Peavey JSX noise gate btw And, I have to credit Mensur for bringing it to my attention!

See for yourself
http://elektrotanya.com/PREVIEWS/63463243/23432455/peavey/peavey_jsx20_guit.pdf_1.png

[deadastronaut]

arghhhhhhhh

it sounds ideal for high gain chunky riffy stuff...nice one....and best of all simple too, ultra cool

and yeah nice idea on the subtle/medium/blunt switching...

re: pot numbers/switches?...arghhhhhhhhhhhhhhhhhhhhhh i know, so/too many options, but worth it definately for hi gain chunky riffs.....on/off etc..optional.

[pakrat]

I've got my board filled, can't fire it up until later though 

[Cap]

Hi! thanks j0k3rx for sharing this!Really like it. Since I have some spare j201 I 'm working on a squeezed pcb layout, 1590B size. As a small contribution to this topic and awesome forum i think I'll share if you don't mind 

[J0K3RX]

Hi! thanks j0k3rx for sharing this!Really like it. Since I have some spare j201 I 'm working on a squeezed pcb layout, 1590B size. As a small contribution to this topic and awesome forum i think I'll share if you don't mind  

Please do!   Make it 3 or 4 knobs if you can!!!

[Cap]

Actually I'm working on the full 6-knobs version like this drBoogie I made loooong time ago...
http://www.diystompboxes.com/smfforum/index.php?topic=86731.msg730006#msg730006
16 mm pots, vertical precision trimpots with boss style dc connector soldered to the board i think. Hopefully I'll order some presens boards next week to try the layout

[pakrat]

Nice job on that Dr Boogie!

[J0K3RX]

Actually I'm working on the full 6-knobs version like this drBoogie I made loooong time ago...
http://www.diystompboxes.com/smfforum/index.php?topic=86731.msg730006#msg730006
16 mm pots, vertical precision trimpots with boss style dc connector soldered to the board i think. Hopefully I'll order some presens boards next week to try the layout

Riccardo,

Oh Damn!!!   That is one of the best boogies I have seen yet!!! Make this pedal like that and I will be very happy!!!
Puts mine to shame! Very clean job, looks very professional!

Very excited to see what you come up with!!!!!!!!!!!

Damn Italians... lol

Just kiddin... I'm half Italian so it's all rock & roll!

Edit: Man, the more I look at your Boogie the more of a boner I get!    I like the pot wiring with the strain relief in the board!!! I have some Dr.Boogie mods I am gonna do soon and I am gonna use your board! I assume you won't mind since you posted it here?  

Edit Again: Kinda reminds me of these but yours looks much better!!! And, just try to find those JFET/MOSFET's... never gonna happen!
http://www.nikitaeffects.com/jfet/jfet_series_en.html

[Cap]

Many thanks Jim  You are free to use the layout and I want to see your drBoogie build! My suggestion is to use presensitized boards since the layout is very dense but I think it's suitable for PnP too. Thanks for the link..never seen before.

The black forest layout it's a bit different because i'm trying to reduce the amount of off-board wiring mounting the pots on the pcb. All in a single sided board
I'll do the best to finish this in a reasonable time.. wish I could have more time for diy 

In the meantime a little preview 


it's not complete yet, maybe there are errors..if you can send me a schematic I can double check the connections

Ciao!

[pakrat]

Wow, that's nice Riccardo!

[pakrat]

Ok, I have a build report for this thing: At first I wasn't happy with the amount of gain I was getting, so JOK3RX advised me to experiment with R5 and R22 (normal and boost) and I'm glad I did! So far I'm at 68k for R5 and 100k (might be a little much) for R22 but I'm still experimenting. I haven't built the gate addon but I'm doing that right now. My advice to anyone who is into high gain pre's is to build this sucker, and experiment with R5 and R22 to get it to your liking. All in all a great sounding high gain pre that doesn't have that ugly fizzly high end.  I'll get some sort of sample together when I have time, but don't wait.... build this!

[Cap]

Still unverified. Hope to verify the layout in the week-end

http://dl.dropbox.com/u/3511352/Black%20Forest%20Rev1%20test.pdf

this is so close to the final version, one jumper on the board and a couple of jumper wires to do under the board.
Once verified I'll provide all the info to wire this fx  

..in a 1590B   ;

EDIT: Thanks pakrat for the report, i use the same numeration of the components in my layout so it's easy to make mods

[pakrat]

I love that layout! Well, I guess I'm building another......

[J0K3RX]

Still unverified. Hope to verify the layout in the week-end

http://dl.dropbox.com/u/3511352/Black%20Forest%20Rev1%20test.pdf

this is so close to the final version, one jumper on the board and a couple of jumper wires to do under the board.
Once verified I'll provide all the info to wire this fx  

..in a 1590B   ;

EDIT: Thanks pakrat for the report, i use the same numeration of the components in my layout so it's easy to make mods

This is a work of fine art!!! Some people just have a knack for this stuff and you my friend are a genius! And, all on single sided pcb too with on-board pots!!!   To me laying out boards is like solving a rubix cube... and I sucked at rubix cube but, I gotta have me some HIGH GAIN so I make my lame layouts...

BTW - What if I make an ENGL using the same layout? That would make your 1590b layout even more bad@ss huh!!! 

[Cap]

BTW - What if I make an ENGL using the same layout? That would make your 1590b layout even more bad@ss huh!!! 
Posted on: Yesterday at 03:22:15 PM

Would be cool!

[J0K3RX]

Still unverified. Hope to verify the layout in the week-end

http://dl.dropbox.com/u/3511352/Black%20Forest%20Rev1%20test.pdf

this is so close to the final version, one jumper on the board and a couple of jumper wires to do under the board.
Once verified I'll provide all the info to wire this fx  

..in a 1590B   ;

EDIT: Thanks pakrat for the report, i use the same numeration of the components in my layout so it's easy to make mods

Cap ~

I was thinking maybe you could add the pot for the noise gate where the presence is? You could still have the effect of the presence by running a 10nF and 56k to ground or something like that... just wouldn't be adjustable with a pot. I find that I have the presence all the way up almost all of the time anyway... Would be nice to keep the most usefull features since you are working with very limited space... Just a thought?

~ Jim

[Cap]

OK! The layout should be correct. Please report errors if you see any.

I used the same numeration of components as J0k3RX did.

http://dl.dropbox.com/u/3511352/Black%20Forest_1590B%20layout.pdf


- pots need to be soldered by the copper side so you can easily bias the effect
- there is only one jumper (red) on components side and the other jumper wires are the yellow airwires

Not tried to etch yet. I need blank boards!!

@ Jim: In the next days I'll try to modify the layout with the gate pot..I'll let you know if it's possible without going crazy
Anyway it can be modded with the addon board or a piece of perf

Comments are welcome! and as a good italian I must write "sorry for my bad english" 

Ciao

[pakrat]

Very nice Riccardo!

[J0K3RX]

Here's mine... probably won't work cause I am dyslexic I have so much trouble laying out tone stacks with on-board pots etc.. But this is what I am shooting for! BTW - The 5 light blue lines indicate where jumpers are to be installed. Also, a few wires need to be added to the switches...