I have a Hartke Bass Attack sitting on my desk. I've used it in the past but stopped about the time I heard it acting as a radio. This makes me think that there could be something shorting out inside it. Between that and my laziness I don't want to open it up myself, but I'm willing to ship the pedal to an interested tracer/degooper.
I dont care if anything unintentionally disastrous happens to the pedal, and if not I'll Paypal the tracer some money to ship it back.
Anyone interested?

Hey all!

Friend of mine has one of these puppies and want to use it on bass...... shame, the unit does not function that great on bass and he asked me if I could mod it.

Anyone knows this baby / knows what happens inside one?

Discofreq link

A friend brought me an old Ross stereo delay (R80 yellow box) and I'm not real (at all) familiar with them. It seems to function correctly and I get delayed signal from both Local/Remote outputs. His concern and my question is about the amount of hiss that rides on the delayed repeats, especially the Remote out which is just delay (no straight signal). Is there an area of the circuit that I should be focusing on that would be connected to that issue? Clock filters, post delay opamp? I know it's...

effectsdatabase:

Two of them actually, but they don't seem complete. I haven't seen them over here though so I thought I would share.

One thing I don't get at all is what is happening off of U1A with all of the transistors. Not sure what that's accomplishing.

Still, I had been wondering about this circuit for a long time. I was going to go through it with my meter and get the cap readings. Not sure if I would (or could!) attempt a straight up clone, but maybe something with a similar setup (Buffer-> Soft...

I traced a Tokai Metal Driver TMD-1 the other day and thought I'd share the schematic - see attached. The FET flip-flop switching has been removed but otherwise all the part numbers and values are accurate to my unit.

It has a very misleading name - it's very far from a metal pedal and more in the solid OD territory. More info on mirosol's site:
(the TMD-1 and TMD-2 are identical circuits - just a different enclosure)

It has some really interesting building blocks, like the fixed-gain...

PantherDistortionShot.jpg

PantherDistortionInsideShot.jpg

The diode of the switching circuit is broken, visible on that shot.
The anode is connected to the JFET gates.

PantherPCB.jpg

The foot switch switches mechanical between the on-state and off-state.

Picked up one of these pedals this week new fairly cheaply. (AU $65 including shipping / US$50 )
IMG_20160902_083507
I wasn't able to find much info at all on the web about these, they basically are a DI with switchable EQ that includes a mid shift, cab emulation and a bonus headphone amp.

Obviously the first thing i did when i got it was open it up and have a look inside.
Expecting to find it all surface-mount, i was surprised with what i found.
IMG_20160829_133659
bit of solder splatter...

Hoping somebody has this - could have sworn I saw this floating around years ago, but I've come up empty. I've got the V6 schematic but I need the parts layout to match the components to the schematic. This is the EH 3034 board.

This is a really interesting Muff. It sounds great but it seems to be low gain for a Big Muff (at least compared to my Swollen Pickle). It's also uncharacteristically bright. Comparing gut shots of this V6 to others, it appears that two of the caps are the wrong size,...

Hello!

I have made a vero layout of the Kitty Hawk Quattro Preamp, only for Lead channel.
I have also put a switch that bypasses the 2nd gain stage, so you can choose between Lead or Hell mode.
After this layout I have built a vero board and it's tested and working.

kitty hawk quattro preamp 1.pdf

Enjoy!

Dr B

Hi Guys,

I just heard about a MXR Resophonic pedal and was wondering if anyone might have a schematic or more info about one?

Thanks,
Robert

Is it true that a few of these (i.e. Black Dog and Tweed E Dog) are simply EH Hot Tubes clones with a few tweaks? Any schematics floating around? I see that these pedals are now discontinued. The videos didn't inspire me to want one, but reviews seem interesting enough for me to want to know more. Thanks in advance.
grol

A few people made noises about wanting to see these so here they are. Not really a stompbox but looks like one :P

These are all pretty large, high res files, so I've uploaded them to my dropbox account.

I've mad a list of all components that aren't viewable, some aren't marked or have been scratched off.

Enjoy :)

Hello everybody,

First of all, sorry in advance if this question has already been answered, I've looked around but to no success.
I've been looking at the corner frequency formula that's generally accepted for the RC filters with a resistor and a capacitor in series going to ground from the feedback loops, of e.g. the RAT (2 filters) or the Tube Screamer(1 filter). The usual formula of 2*Pi*R*C with R the value of the filter's resistor is used everywhere I've looked. Does anyone know how this...

H2O - Visual Sound, Truetone guts

Hello!

I have found a page that have a lot of schematics, here is the link:

Dr B

Hello;
I am currently in the process of building my own pedal for my bass, based on the Rose Screamer , which itself derived somewhere from the Ibanez Tube Screamer.
But I have some questions about the capacitors that the Tube Screamer uses for filtering;

First question is about the capacitors in the signal path; Why do they have such different values? Isn't the capacitance supposed to be adjusted based on how low you want to go? So why have that 10µF capacitor (C9) at the output when the...