Madbean Current Lover oscillation

Chrisq206

Chrisq206

Member
I’ve gone over the pedal a bunch and I’m not sure what’s causing the oscillation. To be fair this Pedal is probably a little over my head, but I keep coming back to it to see if I can get it going.

I did do the update with biasing resistor.

A friend of my got it running really quietly, but once it internal trimmer volume gets turned up, off it goes into oscillation.

Any idea where to start on tracking down the problem?

I’m not next to the pedal now, so I’m going on memory as to what I’ve tried so far. Please excuse the lack of detail.

Cheers
 
Sort by date Sort by votes
I got it working. For some reason the oscillation happens when the input is grounded to the chassis, meaning it stoped oscillating when pulled the jack (Switchcraft) out of the enclosure and disconnecting the ground.

????

Ran out of time to trouble shoot the cause, but pretty happy that it can work at volume without oscillation. Need to figure out the grounding thing and time it better now

Any input?
 
  • Like
Reactions: fig
Upvote 0 Downvote
Chrisq206 said:
I got it working. For some reason the oscillation happens when the input is grounded to the chassis, meaning it stoped oscillating when pulled the jack (Switchcraft) out of the enclosure and disconnecting the ground.

????

Ran out of time to trouble shoot the cause, but pretty happy that it can work at volume without oscillation. Need to figure out the grounding thing and time it better now

Any input?
Click to expand...
Are you using the multi choice enclosed jacks below:
1-4%22_Jack_Pinout.jpg
 
Upvote 0 Downvote
I ended up requiring the in and out as suggested for the effects loop version. Something was was not working with the other way of wiring, but couldn’t figure out what.

It works now which is a minor miracle. I’ve left this project and come back many time over the last couple of years or so and now it finally works.

There is still one problem though

When I switch to the matrix setting there is signal, but no effect.

Any idea why tat might be?

I will probably post another thread on this

Very pleased the flanger side is working and I never use the matrix setting on my EH Mistress, but it bugs me that it doesn’t work
 
Upvote 0 Downvote
Chrisq206 said:
I got it working. For some reason the oscillation happens when the input is grounded to the chassis, meaning it stoped oscillating when pulled the jack (Switchcraft) out of the enclosure and disconnecting the ground.

????

Ran out of time to trouble shoot the cause, but pretty happy that it can work at volume without oscillation. Need to figure out the grounding thing and time it better now

Any input?
Click to expand...

Are you saying that with two grounds (one on the input, one on the output) you had oscillations? That might be a ground loop, at least that's what I have read, I've never seen one in the wild :oops: Where is the circuit grounded now?
 
Upvote 0 Downvote
Bio77 said:
Are you saying that with two grounds (one on the input, one on the output) you had oscillations? That might be a ground loop, at least that's what I have read, I've never seen one in the wild :oops: Where is the circuit grounded now?
Click to expand...
This project has two ways to wire the input/output/switch (luckily!). As my other post said, I switched to the other wiring option and the pedal started working. Never did figure out what was wrong with how I did my initial wiring.
 
Upvote 0 Downvote
You must log in or register to reply here.
Back
Top