hey all ..long time no post from me.
I've a TC-Helicon harmony singer that's got (I suspect) dry joints on the AC input socket.
happy to sort out that simple job buuuutt.. disassembly is not so simple. I've removed all screws and the thing (built pretty darn solid) wont come apart (base from upper housing).
anyone know the trick to get these apart?
fwiw, their service site appears to have the odd loophole, so I found the schematics (link below).. if the link gets tightened up I'll post here if...

Hi all, I have a tc electronics t2 (digital reverb). It’s generating its own noise, when I change the reverb settings I can hear that it has an influence on the noise. I have audio traced the signal to the ak4556 ad da ic. The signal gets to there then seems to have the noise on pin 8. I’m wondering if this means the ic has blown? I can’t find schematics unfortunately. Thanks all

Trying to revive this thing. Actually trying to get one out of two going. Recapped the power supply and boards. Also swapped the starter cap for the motor. All electrolytics were reading at least double their proper values. Initially, I had a lot of motor noise mixed into the audio and no echo. Recapping seemed to have resolved those issues.

Problem now is the echo keeps dropping out and I get a lot of static. If I mess with the motor switch I can get the static to stop and eventually get the...

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...

I have a Smart People Factory Greenline overdrive and it stopped working.
When connected and engaged it gives a lot of noise.

On the PCB I see one red power wire loose (see attachements at place W4 on the PCB).

Any idea how I will be able to find a resource to solve the problem please?

I hope it's alright if I ask here, I'm not a member of many forums. I asked this question on Talkbass as well.

I'm making a quad pickup, so I need to make 4 individual one string/magnet pickups. Should I still be aiming for a 7k-10k resistance range? Or does it differ if I'm using a smaller magnet. I did a test run and don't see me going past 4k rotations around the magnet before I run out of space. Some info:

Magnet length: 18 mm

Magnet diameter: 5 mm

Wire diameter: 0.0026 inches (42...

Hello, I have a Fame CO-10 Punchenizer compressor exactly the same as Akai Professional Analog Custom Shop Compressor. I know that both are clones of other classic compression circuits. I'm wondering if anyone has a schematic, since the pedal doesn't work right now, only in bypass mode, the effect itself doesn't do anything at all, the green LED lights up, but there is no efx!
By the way, it is a pedal that can be found very cheap in any of its secondary brands, and that is very well built with...

Hi guys, i have here a musikding Engineering thumbs Compressor kit that is not working!

Schematic:

Guts Shot

Since i’m not the one who mounted the kit, i checked every component polarity etc. resolder a bunch of holes, and identified a wrong transistor in the circuit. It was with a BC337 instead of a BC327.
I changed the transistor, but its somehing else wrong.
I have bypass sound. When its on, seems like there’s no effect applied. Level pot its working , the other ones i can’t notice...

I live right next to a radio tower its driving me insane. Pretty much all of my favorite pedals need to be treated. I don't really know why any of this works but it just seems to work on classic fuzz and wah pedal.

first trick:
* 100pf cap from base to ground of any signal transistor seems to quell actual discernable radio station broadcasts

second trick
* 68pf cap from base to collector of any signal transistor seems to nip out the radio white noise (you really start being able to hear the...

Hello. There is a desire to connect Booster in parallel to BD-2 circuit in order to be able to send a clean signal (feedback).
When connecting both pedals to the input and output, only the signal of BD-2 itself is heard, but not Booster, when trying to break BD-2 circuit from the output and solder Booster, everything works fine.

Both schemes work properly separately but not together, what could be the reason?
Does it have something to do with the phase? There is a slight presence of sound,...

Hello,

unfortunately i have a problem with my aion oceanid build. I built the pedal exactly as described in the documentation except for two capacitors C7 + C18. I substituted these with “Styroflex” capacitors of the same value. (This shouldn`t make any difference?).
The pedal works as it should except for there is amplification with all knobs on zero (so the signal is louder when the pedal is turned on). As far as I can tell all the other functions are working therefore there is an increase...

everything is working great but the speed knob doesnt change the speed of the LED.

I'm building from this:

Schematic:

I've made a huge mistake.

I wanted to be able to use the power plug instead of the battery, but the power jack wasn't working. These have a plug style that looks like a headphone plug. I opened it up, made some very minor changes to the power wiring and now that power jack works.

Fast forward a few months and one day my PDS 1700 makes no sound. I try battery power, and plug power, and I desperately try and remember exactly what I changed with the wiring. I don't remember what I did. I have...

Hi, not allowed to post to the switching forum so this one seems appropriate I hope.

My Laney VH100R footswitch when plugged into the amp, causes the amp to constantly change between channel A and B. It flips channels a few times a second.
The amp has 4 channels, or 2 channels with switchable gain stages for each, the footswitches left to right are A Drive, B Drive, Reverb and Channel A/B. With LED's coloured green, red, yellow, red.
Connected to amp with 5-pin DIN cable.

I know for certain...

Hello
I lent out an ammoon stereo looper (vague clone of the ehx 720) and it came back dead. I plug it in with the power supply in my studio and nothing happens, no leds light, no sign of life. I measure 9v at the power jack, and get similar voltages around the diodes and components in the attached photo. The schottky D2 seems ok : I get 9.12v on one side and 8.76v on the other, a 220R resistance one way and infinite/open the other.
diode D4 next to it reads 10 ohms resistance both ways. Is...

Hello everyone!

I bought an 1989 MIJ Boos DD3 long chip version that didn´t work. After doing some measuring i recap all electolitycs and the pedal come back to life. But (allways a but) when the pedal is on i only have delay signal on the output. Studying the service manual i notice that Q8 and Q5 switch between on/off for stereo mode when you plug direct out and output at the same time. I don´t understand why Q5 its working like this and i don´t know where to continue lookinf for the fault....

Hey all.

I've recently finished this build with success (confirmed by me also). This one base on solely the schematics which had been shared here -from the 80's. But I'll need to ask a couple of things.

1- Biggest issue is, I have A and B tapered pots. I've tried A1M (only works good in reverse), B1M and B2M. Neither of them has an equal rising response on rate because the circuit itself needs a C1M pot and I can't find any in Turkey. Is it possible to convert any B pot into a C one? I've...

Hi all,

Last night I finished my 2nd project with great hopes, however all I got was a DI sound mixed with a rather hi-freq hiss, and nothing else. I've followed the below project. Also the dist. switch (which is an on/on, 3-pin switch) totally kills the sound when switched on one side.

First I noticed that I misplaced the 560pf on K1/L1 into J1/L1, fixed that, and traced all of the pins one by one and all is fine, no cold solder, jumpers & cuts are just fine. There's no short between...

Hi and thanks in advance for any help you can offer. I have built 4 diy pedals so far that have worked as expected. There are some others that I simply cannot figure out what's wrong. I'm currently trying to build a Rebote 2.5. I am using the tonepad layout and there will be some mods I would like to try but first things first. I'd like to plug this in and have it work as expected.

What I know:
1. True bypass works: switching off the effect allows dry signal through
2. Switching ON the effect...

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...

The why isn't important. I got a bass that I'm doing a lot of mods to; one being a quad pickup which allows me to give each string its own output. Because why not. The Neck and Bridge pickups are always wired separately with their own preamp. I built a breakout box and my own cable to carry the signals, that's not the issue I'm having.

So that's 6 sources, with 4 outputs (1,2,3,4). Neck is always wired to Out1, Bridge is always wired to Out2. The quad pickup (E,A,D,G) has each string go to a...

Delete.

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...

I’ve built one of these using the veroboard layout on the dirtbox form and can’t get it to do anything other than squeal. This squeal changes pitch depending on adjustments on the ‘tracking’ knob and ‘swarm’ selector.
Can anyone post voltages for either this pedal or a working clone? My signal is fine going into the 4046 ic but nothing comes out.

Beetronics Swarm.PNG

Beetronics Swarm schematic .PNG