Hello,

This is my first pedal build and seemed to have hit a snag and not sure how to follow through or what to change from what I have. I'm following an old PDF from GEO Fex
I'm trying to do this Terminal Strip method and have gotten as far as the tuning process, inserting 100k and 10k pot to get a proper voltage reading from the collector and ground to set the transistor gain properly.

The PDF states a -6.8 to -7.2 voltage from the collector and ground is what is usually desired to get...

This is a weird thing I noticed, the Meatsmoke preamp has a buffer at the end of the circuit and a switch that allows attenuation of the output signal

Verellen Meatsmoke.png

While various Kingsley pedals for example doesnt seem to have one

Kingsley Harlot schemtic.jpg

On the Kingsley I dont see much of signal attenuation compared to the Meatsmoke, considering this is a high voltage tube pedal doesnt this make the output of the Kingsley too hot for most pedals after it?

Hi All,
I am very unexperienced in modding but, from time to time, I get the opportunity to help friends and get deeper knowledge of this topic.
A friend of mine needed a mod to solve the issue of volume peak with WH10 V3 . This is a well known issue and, even though several people explain that this pedal should not be used on the clean channel of the amp, my friend uses this pedal with different equipment therefore he could not rely on this solution. It is apparently rather common that people...

HI, I seem to have lost my login as it's been a few years, so I am new and shiny

I was searching the threads and found some info on how to make the reissue of the Ibanez WH10 sound more like the original (cap removal) and about true bypassing, BUT i can't find anywhere any good information on how to add a volume control to reign in the gain boost you get on these pedals. I know people do it but for some reason to my knowledge no one has ever posted how best to do it. So if anyone could advise...

Hi all, I have an issue with the line6 m13. All effects work but the lcds are either blank or black boxes. (LCD colour backgrounds still work) It seems a pretty common issue when looking online, but there doesn’t seem to be any solutions.
Has anyone had experience with this or any thoughts on what to try. Service manual is available online.
Thanks

Hi all, my line6 m13 has blank lcd screens. The colours still change and the effects all still work. But unfortunately the lcds are either blank or sometimes all black. Looking online it seems like a few people has this issue but I haven’t found a way to repair it yet.
Does anyone have any advice? Thanks

I was making a Guitarpcb Pump'd up Tonebender, v4. I am able to get fuzz, but it is sputtery and at a lower volume. Below are my voltages for the IC and transistors. I am worried that I blew two transistors (Q1 and 2). My father, who is a EE, walked me through the process to test the transistors with a volt meter, comparing the resistance of the B to each C and E. I am confused how the pedal can potentially have two blown transistors and still work, creating fuzz (yet bad fuzz). Do these...

Hello,

I need help with my CE-2 build. I bought the Cepheid Chorus board from Pedal PCB, so I am relatively sure that the problem is not a board problem. I am getting a signal coming through when I plug the pedal in, but there is no chorus sound. This is probably because of the R34 47K leak resistor seen at the very top of the schematic. There is no chorus sound, however. I have probed with an oscilloscope, so I know that there is a signal going into the MN3207 chip I am using, as well as...

I bought some 12v 1W diodes. I've repaired these in the past where this was the issue and is in the repair notes linked below as a common symptom of the no power issue.

I replace the diode and I get no power and the PCB at D-6 gets extremely hot. I had to remove part of the trace as it came up.

Anyone have any other thoughts on how to troubleshoot this? Below is the schematic and link to a BossArea thread:

Hi guys,

Someone just gave me an RE-20 echo pedal to fix. Power LED comes on but the pedal is dead. Switching LEDs don't operate either. There's nothing obvious inside that looks to be a problem - no burning anywhere, no fluid residue. I going to check the crystal right now but I don't have any info at all on this pedal.

Does anyone have a schematic for this unit? I can't find one anywhere!

I wanted to leverage the expertise in this forum over a question about how to troubleshoot audio bleed noise. I have pedal that this is occurring and I've tried to troubleshoot it to no avail. But foremost, I'm actually quite interested in the root cause of this phenomenon.

The pedal where I have been observing this is a vintage EHX deluxe big muff EH3054C, the series/parallel version.
The scenario is the pedal has two outputs:
1) compressor out (which is always on)
2) Fuzz and compressor...

Hello,

I've just finished my build of the Black Arts Revelation Super Bass Debugging clone based on this layout :

And 2 strange things occur :

1) Potentiometer seems to have effect only on the last quarter.

I've checked values and i have the same as the layout indicate (100k A x2, 500k A)

2) when i turn the effect on, the “gain” is not immediately as the good value, i can here like a “swelling gain”.

After ~1sec it’s ok.

Just for information I have not found an y 6k resistor so I...

Hello everyone!

I found some NOS transistors in my parts box and realized that these were used in the input buffer of the ubiquitous Boss NS-2 noise gate. So I decided to cut and paste that part of the schematic to build a couple buffer-in-a-box pedals. But when testing them I realized that the signal seems weaker when the buffer is on compared to bypass mode. I confirmed my suspicions plugging into my soundcard and seeing about 5-10dB difference on average between active and bypass.

So I...

I have a Boss OD-1B on the bench. Passes signal in bypass but nothing when circuit is activated. I've traced sound up to pin 5 on the RC3403adb chip but I have no sound on pin 7. Is it safe to assume the chip is bad?

Hi all,

Could you help me out with my T-Rex squeezer? I got it as a defective extra to another purchase, so no idea about its history (wear on the screws indicate that it has been opened before!).
It has very low output. Only when cranking both gain and level to max do I get something close to the input signal level through. I think I checked some simple items (see below), but my electrical background is by no means sufficient to understand or follow the schematic... hopefully someone here...

Hello, this is my first post here.

I cannot figure out which way to orientate the two cermet trimpots on the Tayda Tone Bender PCB.
Looked online and couldn't find a solid answer.
On the PCB, there are two holes with circles and one with a square shaped hole.
Does leg no. 1 of the cermet trimpot (one with dot marked) feed into the square shaped hole?
Pedal has been wired up for PNP. content_dhb15_caps_pnp.png content_dhb15_pcb1.png IMG_5343.JPG IMG_5343.JPG

Please help me, thank you!...

Hi folks, I've got one of the above units (the 3 switch version) in for a repair. It works for all of 10 minutes then cuts out/goes glitchy and really fuzzy (way more than it should, sounds like the speaker has gone).

I've been in touch with Tech 21 and had a lengthy hack and forth but I'm not getting much luck. I've found a schematic on this site so that's a start but the jacks need de-soldered to get the board out to inspect it. Do any of you have any ideas on what I should check when I do...

So I've had this old green sticker BF-2 that never worked. I was from a guy who passed, wife sold his pedals and I bought it. It was cheap and felt bad about complaining so I kept it for about a decade at this point.

The issue is: the pedal definitely suffered some water damage. You can see the rust in the board and inside the pedal. It was probably partially submerged for a while.

The pedal turns on and sound passes through, but there is no effect to be heard. You can maybe hear a...

Hola,

Just got an older block MXR Phase 100. Love it, but I feel there's a little bit of volume loss when engaged. I did TB it so that may be culprit...

Is there a resistor I can swap out that would provide a little more output level?

OK so I am asking for a bit of a sanity check

I built a high voltage tube preamp to use primarily for distortion, thing is I planned on using a high voltage mosfet output buffer like in most amplifiers but that didnt really work so I jury rigged 12 volt Jfet output buffer which is not something I've seen in FX loops

Could it be that a 12V Jfet output does not have sufficient headroom for the amount of output a typical high gain preamp has?

Hello I have a very noisy Deluxe Electric Mistress V1
This circuit :
I've modded it to this circuit (Deluxe V2) :
I thought it would help but it didn't.

I did a recap, a good calibration.
I've read a lot of things in this forum and I tried a lot of things. But there is still a lot of noise at the output. I even had a spare SAD1024 hanging around, I've swapped it and it didn't change a thing. I've also replaced the balance 1K trimmer.

Thank you for reading and for helping if you have any...

Hello. I built a 00funk and it sounds really good. However, I noticed a 'pop' when switching it on (bypass with a 3PDT). I measured 0.3Vdc in the output when active what seems really high to me to be capacitor leakage... but, could it be possible the it is caused by capacitors? I used electrolitic for the last 4u7.
Could it be solved by adding a pull-down resistor?
Thanks in advance