Bootleg - SPL-10 Spiral

Chugs · Post by **Chugs** » 17 Jul 2011, 17:48

I've had this for seven or eights years and only just cracked it open. Sounds a similar to Small Stone. I like it .

Two 13600D JRC A0019D
Two TL072
One C945 K08C

Depth 10KB Phase 100KB Speed 100KB

The phase knob mixes between two settings similar to the colour switch on a Small Stone.

Nocentelli · Post by **Nocentelli** » 17 Jul 2011, 17:56

i'd love to see a trace of this: i like the idea of additional depth and colour pots on a smallstone....

Chugs · Post by **Chugs** » 17 Jul 2011, 18:02

Caps labelled.

Nocentelli · Post by **Nocentelli** » 18 Jul 2011, 09:33

can you post a pic of the box? i can't find a single reference to this pedal on the net.

rocklander · Post by **rocklander** » 18 Jul 2011, 09:44

Nocentelli wrote:i'd love to see a trace of this: i like the idea of additional depth and colour pots on a smallstone....

indeed... also, does it suffer from the volume drop?

Chugs · Post by **Chugs** » 18 Jul 2011, 12:58

Bootleg Effectors are a Japanese company. I brought the pedal on a trip to Toyko.

Well used as you can see!

Volume seems pretty even on and off. Slight drop maybe?

Buffered bypass too which I like.

Chugs · Post by **Chugs** » 18 Jul 2011, 13:24

Actually, not sure if it is buffered bypass or not. I might be confusing it with another pedal. I was poking around the insides of several pedals yesterday and all the circuits are mixed up in my head!

roseblood11 · Post by **roseblood11** » 18 Jul 2011, 13:37

Retracing would be much easier, if you would post a better picture of the component side:
- exactly right-angled
- backlit with a very bright lamp so that the traces are visible

Reading the color codes just from the pictures is error-prone. Itś easier if you do that...
http://www.hobby-hour.com/electronics/r ... ulator.php

Chugs · Post by **Chugs** » 18 Jul 2011, 15:51

I did try and get a shot with a lamp but it didn't come out very well. The board seems slightly thicker than most pcb's.

Haven't had time to measure the resistor values yet.

brentm · Post by **brentm** » 20 Jul 2011, 01:29

I tried a trick in photoshop, but the images aren't square enough and not enough natural light. If you can, retake the picture of the front in a good natural light, as square as possible.

I've had some luck taking the back side of the board, flipping it horizontally in photoshop, then takign the two images and superimposing them on themselves. Change the opacity of the top layer to like 70 percent. Then free transform > distort and line up the 4 corners of the two layers (front and back). The traces will line up and you'll have a sort of xray version with the traces appearing in the correct position on the top of the board. It works best if you have photoshop and can make a few layers with different opacities and flip between them. Inverting the color of the solder trace image will make the traces pop better.

brentm · Post by **brentm** » 20 Jul 2011, 13:14

Here's kind of what I was talking about.

uncleboko · Post by **uncleboko** » 20 Jul 2011, 15:09

brentm wrote:Here's kind of what I was talking about.

My PC keeps freezing with Photoshop CS5!!!

brentm · Post by **brentm** » 21 Jul 2011, 01:47

Ouch, never seen it lock up a PC! Check your event viewer for things to look for.

You can see that the Image > Distort doesn't line everything up perfectly with images that aren't already close to square for the lens of the camera. I traced a board out this weekend using this method and it worked really well. Better if you have Photoshop and can change between images and opacities....

culturejam · Post by **culturejam** » 21 Jul 2011, 14:24

I like that they used OTAs for the all-pass filters but didn't use an OTA for the LFO. It's handy because all of the inexpensive OTAs are duals, so you end up with one left over if you use OTA for LFO. Of course, I'm assuming they have 4 phase shift stages and not 2.

I'll be watching this with interest.

Duckman · Post by **Duckman** » 21 Jul 2011, 17:44

And what happens about avoiding right angles when you draw a circuit?
It does'nt seem a problem for Boot-Leg designers. Why?

Duckman · Post by **Duckman** » 21 Jul 2011, 17:46

Any way, I love the angled PCB for tghe pots. Kinda old radio/TV school!

rocklander · Post by **rocklander** » 21 Jul 2011, 20:03

Duckman wrote:And what happens about avoiding right angles when you draw a circuit?
It does'nt seem a problem for Boot-Leg designers. Why?

I've not heard of this one... what's the story?

brentm · Post by **brentm** » 22 Jul 2011, 12:57

I took another swag at it. It'd be great if the OP could reshoot these front and backs. I'd be more than happy to re-photoshop these.

-Brent

Duckman · Post by **Duckman** » 22 Jul 2011, 16:34

rocklander wrote:
Duckman wrote:And what happens about avoiding right angles when you draw a circuit?
It does'nt seem a problem for Boot-Leg designers. Why?
I've not heard of this one... what's the story?

I can not find where I read it, but I found it logical at the time and I have applied in the routing of my pcb's since.
Maybe I have misunderstood something ... That would not surprise me

Duckman · Post by **Duckman** » 22 Jul 2011, 16:42

This is not what I read, but it works as brief explanation.
Go to page #14

http://focus.ti.com/lit/an/scaa082/scaa082.pdf