I am rehousing a Danelectro french toast fuzz (Foxx TM) and added an led via switching ground off terminal 13 of the 4013 chip, works fine except the LED is flipped, when I turn off the effect the LED comes on. I suspect this comes down to the switch I used:

While I've used this switch in the past on other relay-based pedals, this one is obviously not working. On another Denelectro rehouse I did I used this switch:

That one worked fine but the circuit already had an LED built in. I'm...

Hey guys,

I didn't see the newer Big Muff schematics up anywhere, so I traced mine while I had it apart. I bought it sometime in 2014, PCB reads EC-3003 REV_E. Ref Des on the schematic should match the PCB. Level pot may be wrong (Silk says 500kA) as I replaced the pots almost immediately after getting it because one of the awful, awful ones that came stock broke.

Hopefully this will help people looking to mod theirs.

Joe

I need to replace the potentiometer on a Ross Phase R1 (Purple).
The potentiometer is utterly destroyed.
There is absolutely no resistance reading between the outer pins and the CTS potentiometer is not marked for value.

It seems someone put brakefluid in the potentiometer which in turn ate up the carbon track completely.

If someone has a purple Ross Phase R1, I would really appreciate it if you could
1) just measure the resistance between the outer potentiometer pins for the two cases of...

Compressor before Distortion vs Piecewise function generator before Distortion

In some patents, Tom Scholz extols the virtues of compression before distortion

In fact, almost every SRD product that has distortion stage has also a compressor before it

The compressor evens out the initial high energy attack and effectively boosts the sustain at the end of a note, feeding the distortion stage with a more even signal from start to finish than if it was fed directly with a guitar. This makes the...

So I’m having a weird issue. I’ve used regulators countless times over the year to drop voltages to where I need them to be.

For a few years I’ve been using an 18v regulator with a 24v 4A power supply. Works beautifully. However, if I try to add a 9v regulator, the regulator over heats or goes up in smoke while the 18v regulator continues to remain stable and cool. Any ideas what could be happening here?

Moen Jimi Nova vibe, excellent sounding easyvibe.

Hello
my Quad Preamp has suffered from being stored during near a decade... yes it's a shame :roll:
So of course I will have to change the electrolytics, all the orange drop capacitors which are on the anodes, and of course... the vactrols ...
Some of them have died at power-on, when I tried to use the preamp after its long sleep in the closet.

Of course, I plan to roll my own 19 vactrols, seeing that the most important specs to target seems to be the R off which should be greater that 50Mohm...

Hi!

My Zonk Machine started oscillating/squealing and producing static noise when attacking the strings. I didn't use the pedal for a while and wanted to put it on my board again.

The squealing is even heard when the pedal is off. The battery is new and works fine in other Tone Bender style pedals.

I made a short video of the issue:

Any ideas what could be causing this issue and how to fix it?

Thanks!

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Thought you all might enjoy this one.
The slightly earlier version of this pedal is essentially a 9v germanium FZ-1 with controls to boost the highs or lows. This version has three 2N 5172 transistors and works in the same way, but sounds quite a bit more aggressive. Not sure if this circuit is reminiscent of anything else?
The FD-3A version seems to have been made in 1967 and 1968, and this version from what I...

I haven't seen this one here already, so I gave it a trace both for personal fun and curiosity:

bassmuff.png

Some values aren't there because they weren't marked on the silkscreen like the others, and I'm not going to pull them out to check. You get the gist of it though: they basically doubled up most caps with another one in parallel. The tone stack is a flatter variant. The bass boost literally mixes some lowpassed signal with the tone stack output. The parallel dry blend is done in a...

Strymon - Timeline, Mobius, BlueSky guts

Hello! I'm working on finishing my first build and I've got the effect so close to working perfectly but I've run into this one issue that I can't seem to figure out and was hoping someone on here could point me in the right direction!

The issue is that when I switch the pedal on, the signal fades in from silence over about a second (which is a long time, I know). The interesting part, and where I'm having an issue figuring out what's going on is that this doesn't happen all the time. The...

Hello guys.

I'm one of those guitarists who does not live without volume and tone controls, I am used to set my amp with more highs and cut this excess in the tone control, when I want my guitar more expressive I turn the tone a little way up as a result it works as a second volume control that avoids gain losses.

Strat control tone works ok, but they are effective after 5 and its a little aggressive at the begnining (3 to 0), this circuit I have implement in one of my strats in the bridge...

Anybody know what causes what seems to be an energization problem with these PDS pedals? The pedal will turn on instantly and light up, but the effect doesn't function until maybe 10 or so seconds. Switch to a different delay timing, and the issue starts all over. I've replaced all the aluminum caps but the issue pertains. One PDS pedal in the past had the same issue yet corrected with new caps. I have another chorus pedal of a different brand that has the same issue, but the caps are also...

Hi! I have an interesting device. I started working on drawing his schematic. Everything is clear. Give me time and I'll draw a diagram. If someone already has a scheme, we will cooperate. :horsey:

Superfuzz for Guitar.pdf

Superfuzz for Guitar 1.jpg Superfuzz for Guitar 2.jpg Superfuzz for Guitar 3.jpg Superfuzz for Guitar 4.jpg

A lot of people really like the old Rockman modules. They have been out of production for a long time now yet there are no schematics available. I understand the US patents expire after 20 years so they would not now be covered (?). Looking at pictures of the stereo chorus pcbs, it looks like it would be possible to clone it and I would love to have a go but without an accurate schematic it would be a world of pain. Has anybody else tried this?