New Dr. Boogey Layout: Board Mounted Pots - In Need of Review

[Kearns892]

I've been working on a new layout of the Dr. Boogey with the hope of simplifying the build process, mainly by incorporating board mounted pots. This would lead to neater wiring and (assuming the PCB layout is good) significantly decrease the chances for oscillation and noise.

To make the layout even more "bomb proof": the JFETs all use the same orientation, trimmers are easy to access with the effect boxed up and are logically ordered, and there is plenty of room to work in.

I based this layout off the work of Gauss Markov, and I used his same ground separation in my layout. Also, since Gauss Markov's layout seems to be the Gold Standard of Boogey layouts, I used his convention for parts labeling to avoid confusion.

To help against noise, I tried to follow the practices outlined in Gauss Markov's thread Here, and John Lyon's thread Here, as well as several others.

I think I did a decent job until the tonestack where the physical requirements of the pot position resulted in some long traces and some "backwards" (right to left) signal flow.

To the high gain experts out there, does the tonestack section look problematic? Are there any other potential problem points? Please Critique!

EDIT: The layout is designed for right angle pots oriented "behind" the board such that the controls on the panel are:
Volume - Presence -  Gain
Treble   - Middle    - Bass





I've posted the schematic that I worked from. I traced it directly from Gauss Markov's in a program that would check the layout against the schematic. Also note the resistor labeled "Mid" is for tweaking a 5K pot to get a 2.5K.

[audioguy]

I think if you really want reviews you're going to have to post the PCB files for people to etch and build their own... then you'll get some feedback.

[kvandekrol]

I don't have any input on the board layout (the finer points of high gain layouts are beyond me), but I wanted to say that this looks like an awesome project. The Dr. Boogey was on my build list and I will definitely use this layout when the time comes if you have everything worked out by then.

[Maik]

please load up a ready to each pcb pic...

[Kearns892]

I'm glad to hear people are interested! I was hesitant to post a transfer image, as this is still unverified and I was hoping someone smarter than me could look over the layout from a theoretical standpoint first.

But, since it has been asked:



or download the pdf file from my dropbox Here

The transfer should be 3.2 in x 2.5 in border to border (8.13 cm x 6.35 cm)

Again: Unverified!

[Kearns892]

Sorry! I fixed the transfer image for anyone who is interested. I couldn't edit my post so I altered file the image was linked to.

[askwho69]

Nice! pcb mounted pots is very very cool!

[deeno]

has anyone ever tried this layout? it seems to me correct, but someone has already used it without problems?