windgabgutz.jpg Hello,
I'm building a VFE Windbag and I'm having an issue.
Everything seems to be working fine, but I get a steep volume drop and a muffled under-the-blanket sound when engaged. If I crank the volume, I can hear everything doing what it's supposed to do delay, reverb, envelope, etc...just at a very low and muffled volume like a hi pass filter.
I checked the voltages, and they are a bit off, but I'm not sure what to do about that. If it matters, I subbed a TL072 for the OPA2134...

Howdy

I would need help to understand if this pedal that was sold to me, has or not a problem
Basically if I connect in a series guitar amp effect, the mono output has a fairly low volume.
If I plug in the output next to stereo, the volume is ok.
There is a pronounced decrease in volume both in bypass and with the pedal on, the trimmer gain compensates for this drop.
But, as mentioned, the volume on the stereo input is ok.

In case I connect the pedal in loop instead everything seems ok.
The...

Hello,
I m a beginner in diy kit pedal, and I ve try the octavius kit from pcb mania.

I have some problem like no sound when I activate the pedal.

First question, how should I put the diode 1n34a ?

the two lines on the side indicated on the circuit?

it seems polarized upside down?

and I have a doubt about the connection of my switch.

if not where to look?

Thanks for your help...

Howdy!
My Supa-Puss with not keep time with either the tap tempo or knob. Whatever the setting, it reverts to a rapid blinking/tempo. Changing the power supply does not seem to have an influence on it. Before I send it off to Dunlop or my computer repair guy, I'd like to take a shot at fixing it.
Please point me in the right direction!

Thought I'd pick up one of these to see what it's like.
I was hoping I'd be lucky and it would be a take on the Moen Shaky Jimi/Jimi Nova, which are based on the EasyVibe.
Here's links to the Moen Shaky Jimi and Moen Jimi Nova threads.
And I'd like to thank John Hollis for his lovely EasyVibe circuit. :thumbsup

What's inside then? The highlights:
1 x ST 064C
3 x TI TL062C
4 x LED/LDR pairs

It does indeed look to be generally based on the Moen/EasyVibe circuit although I haven't checked the...

Hi all,

i've tried to build this bass preamp explained by Rob Mods ( in the pedal version.

Here's the schematic (also attached):

However, after soldering everything, i don't get an output when I engage the pedal. However, the LED is lighting up (so stomp switch seems to work properly), but don't hear anything (no noise hum, nothing).

When I bypass the pedal, my signal moves through the pedal, so no issues with that.

Does anyone have tips & tricks on how I could start debugging? I have a...

I'm working on a Danelectro 3699 (Foxxtone) (layout: and am testing by running the wiring through a breadboard to pots (which I've mounted directly into the breadboard) which is my usual testing process before boxing. I don't currently have a SPDT switch for the tone so I've jumpered it through the breadboard and same with the octave switch - I haven't wired a DPDT or 3DPT yet. This layout calls for three 50kB pots but I'm currently testing with what I have on hand until I order (50kB, 250kA...

Hi i bought a ibanez cpl compessor really cheap. I new it didnt work well i have checked everything. i cant see anything burnt or broken what its doing is it will pass a signal when the pedal is turned off soon as you turn it on the signal stops. I even put a new ba6110 chip in it didnt do anything doing the same thing got a signal in bypass signal stops when you turn it on. I have checked all the voltages everthing is good. So would anybody have any ideas what is wrong with it. Here is the...

Built out a janglebox using the lm13700 layout and not getting expected behavior.

Getting a mis-biased type sound, with sound only kicking in with louder notes and decay sputtering out then abrupt silence.

Video here:

Pictures of top and bottom of board:

Pins 3 and 4 are giving me an expected voltage reading of about 2.92v with a .02v max differential between them. Pin 1 is 1.31v with attack at max and 1.20v at min.

Issue seems to stem from pin 5. Getting a voltage reading of...

Hi. I've got this Companion labeled Shin-ei fuzz wah, the fuzz works but the wah does not. I've noticed from pictures of other shin-ei fuzz wahs the wiring in mine looks different. The ground is wired directely to the wah pot. Also there is a red capacitor where it's supposed to be green. (not sure if it's a capacitor). Can anyone give me some advice on how to fix? Thanks

Link to other shin-ei fuzz wah pictures:

Hi all !
The pedal has no effect when engaged. It also has a big volume drop.
There was a shortcut due the bad shape of the Color switch. I cut the common leads and the ones at the down position and put together.

One of the transistors was dead, I put a bc239 (same pinout as the bc309's.)

I guess I can use ca3094's instead of eh1048 wich are completely impossible to find. Now there are five ic sockets for the op amps.

The ca3094 near the pot area measures 0.70v @ pin 6 with the...

Hi all !
The pedal has no effect when engaged. It also has a big volume drop.
There was a shortcut due the bad shape of the Color switch. I cut the common leads and the ones at the down position and put together.

One of the transistors was dead, I put a bc239 (same pinout as the bc309's.)

I guess I can use ca3094's instead of eh1048 wich are completely impossible to find. Now there are five ic sockets for the op amps.

The ca3094 near the pot area measures 0.70v @ pin 6 with the...

Hello everyone,

I'm moving my post which was initially on the MXR MicroChorus dedicated thread ( here, since it seems to be the proper location for that!

So, long story short:

the MXR MicroChorus uses a SAD512 BBD chip which is hardly sourceable.
Fender3D provided on page 5 a complete rebuild schematic and a PCB in order to use a MN3007 chip instead
Since the original schematic and the updated one are quite close, I just made a small additional board

And now I'm a bit confused!

So...

Hi

My Mooer Preamp is dead. It was working fine until yesterday. It powers on but just flashes all the lights after booting up and no sound. Any ideas?
I already did a factory reset.
Anyone have schematics?

Thanks

I basically use my rat between 8 and 8:30 o'clock - or right above zero on the the pot sweep. It is super hard to dial in with the stock design since every micro movement makes a huge difference. This is the only part of the pot range I use, so I'm wondering if there is any modification I can do to get more sweep in this range so that I can use this pedal more easily and so I don't have to spend a few minutes micro dialing it in if the pot moves a smidge?

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...

Hello everybody, so, recently i built Civil War Big Muff clone with schematics from tagboardeffects. All the components that I used have the same values like the ones in the schematics. For transistors i used kt3102em and for diodes kd521a.

First build was not working from start, i was not getting any fuzz, just a slight distortion. I noticed that when i rolled off the sustain (distortion) potentiometer that I would get constant, high pitched buzz (sounding kike synth), after a minutes of...

Hi,

I am trying to learn how to design PCB with KiCAD. My first attempt is a simple 3PDT breakout board for true bypass. Before I place an order, is anything willing to give my design a sanity check?

TIA

3PDT2-grbr.zip
3PDTv3.zip

Hi,
I'm trying to make an inverting op amp buffer as I want to flip the phase and buffer the signal. I've attached a photo of my breadboard and the circuit I'm trying to follow.
When I connect it all up, the output is super low, -30dB or so from where I started, and it looks like my signal is being low passed. I've tried a few different resistor values from 1M to 10k for both resistors with more or less the same result. Also tried a TL072 op amp, also no luck.
I assume I'm missing something...

After 10 years, I managed to damage the pedal by plugging in an 18V source...

I've replaced the three IC's but no joy, any assistance would be greatly appreciated...

thanks in advance,

Hello there,

I built my 1st pedalboard using an aluminum frame and two diy modules made from cast Hammond project boxes.
Module 1 is a power module with an IEC plug + on/off switch. allows me to plug a power cable direct into the board.
Module 2 is a signal in-out patchbay which includes a mono guitar input/ pedalboard input and two outputs (mono/stereo)

Module 2 is my issue, I don't think I have it grounded correctly. The input jack is a metal switchcraft jack which provides a ground to the...

Hello everyone. I have a Dunlop UV-1 univibe. Its the version with one main PCB. Not sure what Rev it is off hand. The issues I'm having are, noise in the signal path and an unresponsive speed control. I get static of sorts when it's in bypass and active. I also plug in the UV-1FC foot controller and the it bypasses the speed knob but it is still unresponsive. I'm guessing it could be the the optocoupler before the intensity control. But I can't find any replacement for the NSL-39S52. Volume...

Hi all,

I built a lizard queef following This guide and need some help debugging.

I didn't have all components to hand so I used 2n3904s instead of the 2n2222s and used a 2n4401 instead of the 2n5088. I also didn't have a 1k pot so instead used a 10k at first and then just rigged up a 1k resistor and a 510R resistor to fix the balance at half.

I haven't been able to get the pedal to work. The led illuminates when the switch is pressed but there is no sound. The pedal also works in true...

I am working on my first pedal which is an Analog Sun Fuzz pedal from PCB Mania. I have made some good progress with help from this group. First I was able to fix my 3PDT connectivity and successfully got the bypass working. After checking some loose wires I got the LED working. It's kinda fun troubleshooting... but it will be even better when I can close this bad-boy up and play. ;-)

Situation: I have a full finished Analog Sun kit. It switches successfully, plays on bypass fine, but does not...

I completed my first build an Analog Sun from PCB Guitar Mania pedal. What a fun project! I'm excited to be trying out something new.

After final assembly I have some issues and was wondering if the community could help with a couple of Noob troubleshooting questions. Apologies if these have been discussed earlier, I checked out GEOFEX and was both impressed and overwhelmed with this community.

Situation:
======
I have completed the build (see attached pictures).  I plugged into the DC...