Ludwig Phase II Clone Debugging and Miscellany

[theehman]

R18, 120k 0.25W missing from BOM

I had R18 written on my sheet but I forgot why I wrote it there.  Thanks for reminding me.


PCB:  holes for 1N4004 are too small.

[UKToecutter]

1N4004's must vary on lead diameter.
Mine went in but they were a bit 'tight'

[theehman]

Might be a good idea to mount the trimpots on the bottom of the console PCB.  It would make tuning possible without dismantling the pedal.

[UKToecutter]

QF+1 missing from BOM (NPN EBC)

[Seven64]

just got my boards today and gonna get started on it really soon.  wondering if its possible to use the m-audio expression pedal (ex-p) for the manual control.  they are about $30 on ebay, and was thinking it looked better than wasting a wah enclosure.

[R.G.]

The PCB issues have been corrected on the layout for the next version.

I'll update BOM with QF+1.

wondering if its possible to use the m-audio expression pedal (ex-p) for the manual control.  they are about $30 on ebay, and was thinking it looked better than wasting a wah enclosure.

Any rocker that has a 5K linear pot, or can be modified to do that will work. I don't know what pot value is in the M-audio exppedal. Pretty much any linear pot value can be used with the buffer circuit as mentioned earlier.

I'm inserting a collected errata page on the instructions for this board set, which I dub "the UK Boards".

Trimpots can go on the bottom for access.

[Seven64]

nice.  if anyone doesnt get it by the time i get around to it ill pioneer up that one, as its only $30 which is generally cheaper then i can find a wah for.  and it already has the cable as well

im excited to get started on this one.  except i dont have room on my board for it....

[R.G.]

On the issue of using expression pedals with the Ludwig clone: I found this listing of expression pedal pot values by sonda01 on Harmony Central.

Roland RV-5 - 10k linear
Line6 EX-1 - 10k linear
Mission EP-L6 - 10k linear
Moog EP-2 - 50k linear (reducable)
M-Audio EX-P - 10k linear
Korg EXP-2 - 50k linear
Boss EV-5 - 10k linear
Boss EV-7 - 10k linear ("extra range" pot adds up to 50k ohms)
Boss FV-50L - 50k linear
Proel Volume Pedal - 100k linear
TC Electronic X1 - 25k log
Ernie Ball VP jr. (active) - 25k log
Ernie Ball VP jr. (passive) - 250k log
Kurzweil CC-1 - 20k linear
Pigtronix EP-1 - 20k
Bespeco VM18L - 20k

None of them are 5K linear. However, the 10K's might work as is with some tweaking. All of them would work (although weirdly for log pots) with the buffer circuit, I think.

[UKToecutter]

"I'm inserting a collected errata page on the instructions for this board set, which I dub "the UK Boards".

R.G.

It's a good thing that I'm not sensitive........

:-)

Andy

[R.G.]

AWK! Sorry. It's true what they say, us engineers are clueless about people. 

I hereby un-dub them and re-dub them "R.G.'s Second Attempt".   

[UKToecutter]

I vote for a blue solder mask on the next batch!!!

[R.G.]

I'm good with that!

[UKToecutter]

You know, one of the great things about this build is that there are very few 'special' components required.
Apart from the switches and the trim pots most of the components came out of my stock bins.
Even the 2N5551's and the 2N5401 are soooo cheap that I bought 100 each at about £7.00 total.

Great work with the layout RG and total respect to Keppy, Dino and PinkJim for getting it off the ground.
My boards are stuffed, I've centre punched my case and now I have to wait for mouser to get the 3PDT switches into stock.

What we need now is a 'son of Phase II' to bring it right up to modern standards.

Andy

[R.G.]

Adding transistor pin voltages to the buildit manual.

...oops, did I say "manual"??   

[UKToecutter]

Here's where I'm up to:



Andy

[R.G.]

Nice work indeed.

[Keppy]

nice.  if anyone doesnt get it by the time i get around to it ill pioneer up that one, as its only $30 which is generally cheaper then i can find a wah for.  and it already has the cable as well

Stereo cable? Don't forget, this one needs three conductors!

[Ry]

Nice looking build!

[UKToecutter]

R.G. 
What forward voltage and working current have you assumed for the LED's?

[R.G.]

I think I guessed at about 2V, although with 40V+/- to play with, it's almost immaterial.  I didn't want to load the regulated 35V, so I just glommed on lots of resistor in series and used several 1/4W's to get the power dissipation that causes. The suggested supply is way underused for power, so I just wasted it in resistors.

Call it 46V/8.1K = 5.6ma per LED, about.