frequencycentral Verified Dr Boogie layout - no offboard wiring!

[frequencycentral]

I wanted to board mount all the pots and use vertical trimmers for this layout. I'm pretty sure the layout is correct re the connectivity (though there may be errors as I haven't triple checked it yet), I'm just a little concerned about the proximity of the gain control to the input section.

Oh, the input is the green pad, the output is the blue pad.  

[Brymus]

Hey Rick that looks nice.
I am no expert,but I do have a Dr Boogie thats not in an enclosure yet.
SO I stuck the gain pot and its at present unsheilded wires directly on the input part of the board and input wire,which is also unsheilded.
And no increase in noise at all,zip,nada
I hope that helps you.
I do plan to use shielded wire for the in and out as well as the gain pot before boxing it up.
I also added a 12n from input to ground and this removed alot of noise without changing the sound.
Bryan

[Michael Allen]

Proximity shouldn't be an issue with the gain pot I wouldn't think, since the leads will be so short.

I don't think you can do it in the software, but you might add a ground plane

[frequencycentral]

Verified!

Dr Boogey

Nice build! That's my layout, yes?

http://www.diystompboxes.com/smfforum/index.php?topic=83671.0

How does it sound? Any issues with the layout - or is the layout now a verified layout? I still haven't built one using that layout yet.

HI Frequency

It works just fine. There are a few changes on my build.
The 2k pot was a 5k with a 5.1k across the lugs.
The 25k pot was a 100k with a 39k  across the lugs.
The 20pF was subbed with a 100pF
C12 was subbed with an electro as I ran outta non polar.
Oh and I had to put a 20nf and 10nF in parallel for the c21.

I biased the jfets all to 4.5v or near as damnit. It sounds fantastic. I may yet tweak the bias to see, but for me the level of hiss is totally acceptable for such a high gain circuit.
I used shielded cable throughout, as you can see a bit longer than I should have but I wanted things flexible and did the wiring outside of the enclosure.

My only gripe is my big 1nF box caps and the 100pF wimas are too big really for this layout. I dare say ceramics for the small values woulda worked well.
All in all it was a squeeze but it works first time, no issues. The tone controls (the treble in general) seem very "interactive". Is this expected / normal?

Cheers!

board pics

Parallel arrangement for C21, resistors across pots.


In hindsight my trimmers arent ideal either, Trim 1 and 2 are above R1 and R2...
see C5 - too big really, its sat on top  of R6.
C16 and C16 a bit close too.

Ian

[deadastronaut]

brilliant!..

[mr_deadmaxxx]

the two lugs on your trimmers are not shorted?is that ok?

[stallik]

Hi,
I've built this circuit and while it sounds really, really good, i'm plagued with what sounds like a mains hum. It's a loud hum with the best 12v power supply I have but is deafening with a 9v battery! no matter how I adjust it. I can lower the hum with the 12v supply by reducing the gain at any stage but to get rid of it completely, I have next to no overall gain from the circuit. I populated the board with what I had around so no foil box caps, instead a mixture of ceramics, tantulum beads & electrolitics. I think the latter are the correct polarity. Ive used sheilded wire. The orange wire at D1 is a temporary mess, i popped a couple of posts in to quickly change the diode. This has now been correctly installed & the footswitch had now been replaced with a 3PDT to get the led working
Am I asking too much to make this thing quiet?

[stallik]

Just to finish this one off in case anyone reads this old thread, my issue was caused by the 9v  not being connected to ground. It's now quiet - very quiet & sounds great

[frequencycentral]

^^^ Nice! I've got a few space PCBs for this if anyone is interested.

[Keeb]

^^^ Nice! I've got a few space PCBs for this if anyone is interested.

I've been looking to build on of these and the no wire pots are definitely appealing!
Interested in parting with one?

[Subzero]

I'd like one pcb too.

[LonePhantom]

Yeah, I'd be interested. How much would it be for one pcb? Cheers

[frequencycentral]

^^^

All folks who requested PCBs - check your PM's.

[radio]

Hi

I'm interested too,hopefully not too late.

[J0K3RX]

Great job Rick!!! I etched it last night and should have it up and working tonight...

[tazwolf]

I would be interested in a pcb if they are still available.


/Taz

[deadastronaut]

@jokerx: 

let us know if you do any mods on this!...especially to the tonestack!!!..cheers rob.

[stallik]

Just thought I'd post acouple of pics of my final build. This was the first time I've ever made a PCB & I'd wanted to use the smallest possible box, Zvex style. I had to grind away 2 of the screw posts in the corners to make room for the 6 pots & was forced to use endpin jacks as there was no room for normal ones. As you can see, it all fits - Just! I even had to make a film protector to stop the metal battery casing shorting the solder joints on the underside of the board. Of course it will be a total nightmare if I have to get at the board for any reason...
The sound is just amazing. I plug it into an old Roost valve amp and it compares very favorably with my boogie with the exeption of it does not clean up as well as the real thing when I turn down the guitar volume. On the other hand it has more gain & sounds much more like a boogie than the real thing when playing at 'don't wake the wife' volume

[J0K3RX]

stallik - That is a great looking build!! I made one also but for some reason mine isn't working? I have to go back over it and figure out where I went wrong... I have built probably 8 or 9 Dr.Boogey's and no problem... hmmm? Seems like this one was gonna be a breeze but noooo damn-it!!! Well, it was easy to build now I just gotta figure out wtf I did wrong lol

[deadastronaut]

+1 cool build...squeeze that mutha in there!!!..