Looking for any information about this one...

All I could find was one gutshot:

I've got into the old Pearl effects. So far I've got schemes for the od-05 overdrive, co-04 compressor, ad-08 delay, fg-01 flanger, oc-07 octaver and ch-02 chorus.

Any others you've got would be great. Especially the ds-06 distortion, ge-09 graphic eq, pe-10 parametric eq or the very strange th-20 thriller!

Many thanks.

Hey all,
I'm looking for schematics from the MXR Reference series. Particularly, the micro-amp. I know there was some changes made throughout the years, but i'd love to get my hands on some of the old original schematics.

Wiki!:

regards,
tm

Something a bit different.
Uses an LM308 chip... unusual pedal, but nothing great.
I think it's an Overdrive and a Compressor combined.. somewhat like the DOD Attacker.

Is this pedal really analog?

'Cause I think I read some stuff a while ago saying it wasn't.

Any comments?

Hey all!

Just had this pedal in; the owner wants the pedal to sound less 'plastic'. Dunno yet as it is too late to listen.

Any schematics?

Edit; found the Ibanez one at AG's site. I'll compare it!

Ibanez ST-810

Please let me know. Reversing is no option as I'm running toward a deadline. Will sign a NDA without a problem.

Anyone got schematics of this or the VT-3? I've got a VT-2 that's gone a bit dodgy (intermittent trem effect) and was never that great to start, so mods are also quite welcome. Not an opto-type so far as I can tell.

HI !
I,m bass player and I,m trying to find schematic of actual EBS chorus .So if
anyone had schematic that were fine .
THANKS
gsb

Hi Guys,

I found these gutshots of the CFH somewhere a while ago, forgot about them, got interested in the CFH again, checked back and saw SMD parts. Now I don't know what to think, apart from being a pain in the ass to mod, are SMD parts in anyway affecting the sound? (on one side, the parts will have the same values, but on the other i imagine some reactions might be different?).

I really like the sound of the wah, and the possibilities. I have an Ibanez WD-7 Weeping Demon now, which I...

Does someone has the schematic of an Ibanez DL-10? Someone took out the trimpots to set the delay time and now she is constant in lo-fi

Has anyone picked one up? Looking for a schematic for this one.

Some gut shots found on TalkBass:

Thread is here:

Hi all, here's my latest buy for 30€ at the very same local shop full with litterally given away second hand vintage stuff (were I already did some nice catches)...

img_1609.jpg

The pedal is complete (all the knobs and even the rubber thing at the back), needed a new battery clip, and seems to have been repaired by an awful man who overheated the big DC jack pad 'til it went off, and then made connections of his own with solder... Ugly but seems ok...

Here's a zip file with the guts in...

Here is a picture of the pcb of the Dunlop Zakk Wylde Wah:

analogguru

I got this as an early Xmas gift, so I thought I'd pop the hood and have a look-see. :)

Looks like the core is a Maxim MAX830cwe. Here's Maxim's page (which shows it as no longer being made):

Also, I don't know what the component marked 101 is. I have a tight shot of it attached. Looks like an inductor?

This is a nice unit. It's very well made and quite heavy. :)

I currently have three Dunlop Crybaby GCB-95 units. I thought I'd post the guts for the sake of comparison.

The first example is the one I got when I was in high school. It's a Rev-E circuit board, which puts in being made in either 1990 or 1991. It has board-mounted pots, non-covered inductor, no battery door on the bottom plate. It uses the male power supply plug type. And *no* input buffer. Transistors are 2n3904.

The second has a Rev-G PCB from 1994. Black plastic covered inductor....

My RV-3 (and all - or the majority of - Boss RV-3s, don't know if this was fixed in later versions) has a slight interruption in the sound when turning it on/off. It's like a fraction of a second, but when turning it on/off in a middle of a passage it's noticeable.
Schem:

Is it fixable? If so, is it an easy mod?

Also, Analogman does a mod to this pedal (he also does it to the DD-X series pedals): basically it cuts the high end out of the repeats in the delay modes, so that it has a more...

Dunlop EVH phase 90 schematic need or tell me resistors value marked on PCB EVH Phase 90 as R5 & R6. please!

Link to manufacturer's page:

There doesn't appear to be a schematic around for the Red Box Classic.
This is not a trace of Red Box but it does offer some insite to the filtering used.

The short story is:
- I estimated the filter transfer function from response measurements
- The transfer functions didn't agree with the Red Box Mk1, Mk2 or the pro.
- In 4x12 mode the low-pass filtering is close to the Tubeman 1.
The Tubeman 1 low-pass filtering is very close to the Marshall JTM30/60.
- The 4x12 mode is pretty much...

Here it is. Classic CA3080 compressor but with a few interesting changes. Check out the tone control and the envelope follower section... Do you recon it would be difficult to convert that envelope section to drive an LED/Optocoupler? I wonder. I'm designing a new compressor circuit at the moment (It HAS to be optical!) and this could be what I've been looking for.

I love these old pearl FX. I've been trying to pick up one of the old pearl overdrives for a long time now!

Found this via google;

All new toys must be promptly taken apart - quite right, and photographed, and posted on the web.

Like the way it's made, with the snap-out sub circuits. I think they've done a great job with their new die-cast box products.

I don't _think_ the DSP has internal Flash / eeprom, so the firmware may be accessible... mod-able :)

(edit)
BMODE1–0 Description
00 Execute from 16-bit external memory (bypassboot ROM)
01 Boot from 8-bit or 16-bit FLASH
10 Boot from serial...

This rare bird arrived at my doorstep recently:

It's an interesting one. The control names certainly had me intrigued:

So, I plug in and try it out. Very big fuzzy distortion. Very fat, and a little bit loose on the low-end. Turning the tone control gets mixed results; there is a sweet spot just before 12 o'clock where it really sounds nice, but too far clockwise and it's too thin and shrill, and too far anticlockwise and it's too dark and muted sounding. Overall, it kinda reminded me of a...

hi this is my first post i have an deep impact pedal, but it does not work the input level light are all on full and the screen just reads 88 and there is not sound. i have contacted panic solutions to look at it but they want £60 just to look at it to see if the main chip is blown, can any on help or have any spares or maybe look at it for me thanks rob