Here's an uncommon one. The TubeWorks Pure Tube TW303 SMOOTH overdrive pedal. It's one of the B.K. Butler designed Tube Driver derivates from the mid-late-90's. I had this unit in for repair and I took the time to trace out the schematic to share here. Inspection of the circuit board revealed that it is the same board as was used in the Real Tube RT-901 and Blue Tube RT-903 5-knob Tube Drivers, so this schematic should give us at least the same topology as used in those pedals if not the same...

Hi, last week I recieved a pedal for repairing. It is a mxr distortion+ from 1982-84. It is part of the 2000 series pedals that MXR built withing those years. It seems like somebody has been messing around in the inside of the pedal, as many cables are bad soldered and the chip and transistors seem changed. The IC now is a TI RC4558P ad I believe those units sported the JRC4558.

I have look for schematics through the web but I´m not capable of finding anything about it, just a web where they...

hi guys,

i checked out one of the new electro hysterix XO deluxe memory man thingies yesterday, it has 4xmn3008 in there (reminds me a little bit of kaputepalla´s expansion board idea, they are actually on an expansion board).

i´ll try to take some pics later today if anybody´s interested.

cheers,
lohstah

Does anyone know which adapter this pedal takes, and where I might get one? Thanks for any help.

Ok, as promised here we go for the guts of the compressor which is sold under a different brand names.
In my case it was called DiMavery.

First shot is a front/top view - second shot is from an angle.
As you can see it is a metal case and the potis have aluminium knobs.

When we open the unit we will find the track side of the pcb as can be seen in shot 3. The pcb is held in place with the DC-jack and one screw. This is enough and easy to disassemble.

By removing the screw, the pcb can be...

Hi,

Is there a general consensus on which Original Rat schematic is correct?

I've seen these:

I want to build an original and would like to do it right.

Is there a schematic for the Vintage Reissue or is that the same as the original?

Thanks for the help,

Eric

All about the MXR-Flanger:

enjoy,
analogguru

I got this one in for some TB'ing. Thing sucks the life out of all the signals you put in :)

Some info on this pedal

Just another MXR Phase 90 clone with different values. All caps are ceramic except for the polarised which are tantalum.

Enjoy!

I'll post some gutshots later!

Hey all!

I have this Phase 90 in repair....... and it does not work :) I probed it and I lose the signal after the first IC; I guess it is due to the fact that the voltage on the 1M is very very low.

I have a hard time figuring it out because the board is not similar to the normal version of the P90 but slightly different. Someone care to share the rev D schematic (if it is available)

Looks like someone has been studying the schems at ROG :D

The designs look like some of the DIY designs that someone did with etching a few years ago....

didnt get pics but I cracked one open at GC the other day. No transformer... its an IC based octave up. very minimal parts count. I believe it was a dual opamp, TLO62 or 64? i cant remember now... Its a raspy little bugger, i want get one and try out some mod ideas to improve the fidelty of the octave and make the tone of the pedal more robust/full sounding hahaha you'd think i was talking about coffee ahhaa.

just wondering if anyone knows where there are some good gut shots?

puppiesonacid

Im wondering if anyone has any gut-shots of this or knows what it's based on.
I've heard good things about it and I'm curious. I haven't seen any on Ebay for a decent price or I would have already picked it up.

Not sure exactly where this should go, but has anyone else noticed the barrage of new BBE pedals (patterned after vintage stompboxes)? They look pretty sweet to me. That analog delay at the bottom has me itching.

Linkie

one friend make his pocked pod with footcontrol, using usb connector, bekause is too small.

Here:

some pictures

SCHEMATIC

Anyone have a schematic for this?

Might anyone have any schemes for the soundtank series. In particular I have the FL5 and the AW5. I purchased them from a used music store and their both dead. Would like to get them going. Are they similar to any of their other boxes. Thanks for your guys help Danny

Had anyone seen schematic for ONE-SPOT power supply around?
I was wondering how it supply 1.7A with that small package....

I saw one of these listed on my local cragslist today. Never heard of it, so I did little Googling and came up with some gut shots:

Hi everyone!

I hope this is the right forum, I didn't know whether to put this in here or the Workbench ...

Anyway, I'm going to be building a Small Clone-clone, the version with the SAD1024 BBD IC. I was just wondering if anyone might know what the values would be for the 3 diodes near the BBD on the schematic, the image below is the schematic with the diodes in question marked in red.

The MN3007 version of the Small Clone has just one diode near the BBD IC, a 1N914... Maybe the SAD1024...

I was thinking: why does it always have almost the same amount of gain even when the gain is at min?
I just don't understand: at min it should have a gain of 1 and at max 200...

Can anyone help me understand please?

Thanks! :thumbsup

Last one I'm going to trace this weekend. Pretty big bang for the buck for those who are not afraid of plastic cases and highly tweakable for a chorus that can be bought for 20 dollars or less. Interesting way of driving the MN3102 as pin 5 is not used. Also a surpising way of mixing the dry and wet signal on the second output.

Apart from the fact that it uses a MN3209. Although that could be an error as I got this thing with that chip in place and soldered in 180 degrees wrong. Always...

Another Dynacomp clone for those interested.

Yes AG, the caps in the bypass switching are 10n and not 47 as expected. Yes the power supply filter cap is rated 10 volts only. However, feel free to use the :hmmm: smiley again. :wink: