Hello everyone. I need your help. I finished this pedal from this schematic, and I have a problem. when i touch the tip of the plug the amp sounds, even when i move the potentiometers everything seems to work, always when i touch the tip. but when i put the plug in the bass, there is no sound. I double checked all the components and everything is fine. The only problem I noticed is that when I plug in the passive/active switch, the pedal doesn't sound at all (even when I touch the tip of the...

I have a unit where the Regen knob is going haywire. No matter how much I turn the Regen, it always product endless repeats. Any idea what could be wrong?

I noticed in some of the older Boss service manual, the input/output signal is mentioned in the unit of dBm . May I know what tool can I use to measure signal in this unit? Is there some sort of dBm meter exists?

Hi, so one of my recent builds is a Ram's Head Big Muff based on the layout on the Tagboardeffects site.

Now it sounds really wonderfull and creamy and all, it's just really low gain compared to sound clips I hear of this pedal.

The voltages on the transistors seem fine (could post them on request), they are 2N5089, as far as I understand the HFE of these transistors can vary between 400-1200 so could this just be a matter of having a 'bad' batch of low HFE ones? I currently don't own a...

I’m building a fuzz face circuit on my breadboard with two BC108 transistors. I have gone over this thing again and again and have checked all the components and they are fine yet I still get no signal out of it. Can anyone take a look at my work and tel me what I did wrong? I would really appreciate it. Thank you.

Related Question. I have constructed a Univibe clone using the following schematic which uses a recommended 24 volts DC. The design seems to be a forumvibe but which version I am not sure. Some of the caps are rated at 25 volts so this seems a small margin of error.

I want to use a Road Rage charge pump to boost my pedal board voltage from 9 volts to 18. The device uses an LT1054CP charge booster to amplify the 9 volts into a higher rating with no audible whine noise.

I have constructed the...

Hi everyone,

Hope my questions here won't be too dumb; I'm trying out a couple of circuits on veroboard/tagboard with layouts from the tagboardeffects site, one of these is their Boss SD-1, now I have some soldering/troubleshooting experience (I've built pedals and tube gear before) but I can't seem to make the clipping section of this pedal work; it passes signal fine and the level and tone controls work as they should. But no matter where I put the drive knob it doesn't do anything, I've...

I have constructed a Univibe clone pedal which works on 24 volts DC. I am trying to make it work using a 9 volt DC supply and a charge pump using the LT1054CP Integrated Circuit. I was hoping to get 18 volts out of the charge pump (Road Rage 2019) but it supplies less than 17 volts. (It varies rapidly from 16.5 volts to 16.9 volts). I have measured the voltages around the circuit and I have enclosed them in the attached circuit diagram. I have corrected one ground loop already but I cannot get...

Dear All,

I got a Fulltone OCD v2.0 for repair, the issue is, that the LED is all the time on, no matter where the footswitch or the bypass mode switch are. Also the LED seems to be quite dim. I have opened the box, and saw, that C14 is missing, however I have seen other pix on the internet with that cap missing too. Also I was foolish enough to remove the LED, only to find that it is ok, but I have destroyed a trace and a pad in the process, so I'll have to rework that too... Anyhow, I don't...

Hey all! First time, long time, etc. Was hoping somebody could give me a hand repairing an oldish MojoHand FX Bayou Trem ( ). This is a pedal I've had for a while and haven't had any problems with, but sometime I think in the last move I must have rattled something loose, since it now displays a lot of the classic non functional tremolo symptoms - passes clean signal, volume control works as a clean boost, and rate LED flashes with the rate knob, but no tremolo when the effect is turned on.

I...

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...

Hi, I've just rebuilt a Small Stone phaser from the tagboard layout:
SmallStone.png

and am having some issues tracing the board - I've built one a while ago, so I know that the layout is good, but does anyone have voltages for this particular version of the circuit?

I've had this one for a while, was working perfectly but now i get low output and the effect drops volume when engaged, bypass works, the Chorus/Vib/Trem modes all work but the sound has a very loud bass thump to it.

I've attached a schematic i've found, I suspect the first Transistor because the LFOs all work and the leds behave normally, anything other i need to check just in case ?

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

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

Hi there,

Working on an Ibanez AD-80 (narrow box) currently. I’m in the process of replacing a broken diode and just want to make sure this the right part on the schem? Going to replace with a 1N4004.

ibanez1.jpeg
ibanez2.jpeg

Link to schematic:

The pedal powered on (led), but passed no signal. There was one cap that had broke lose from the board and this diode. I re-soldered the cap, and will replace the diode. hopefully this brings it back to life!

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...

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 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...

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...

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...

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...