Chunk Chunk issues

[dog4107]

Ok I got my Chunk chunk finished but Im having a couple of problems:

First issue is the biggie I get a bypass signal but when I engage the unit I have a very weak signal and hardly any distortion. Turning the lvl up to max doesn't even reach the amps volume. I followed the BOM and didn't change any part values, didn't do any mods and all of the trimmers are around 4.5 v.

Im not a tech so Im looking for a place to start or if some knows what the issue is right off that would be awesome.

Second issue is that when the input cable is removed the unit still has power. Ive never ran into this issue so Im not sure what it could be. I now Ive 2 pedals that have this issue. Ive double checked the wiring (both pedals are wired differently).

Thanks in advance

[DutchMF]

First, check your wiring against Madbeans Standard wiring diagram. Next, check all your solder joints for any cold ones. After that, check (and double check!) your component values, check for solder bridges etc... If you want to narrow down the options, first read the Rules For Getting Tech Help, and then re-post add to your post accordingly. Good luck!

Paul

[jimilee]

Check your resistor values, you may have gotten a batch of mislabeled. Secondly are you powering from battery or adapter. You still get power with no cable with an adapter but not with battery. Off board wiring is correct?

[dog4107]

First, check your wiring against Madbeans Standard wiring diagram. Next, check all your solder joints for any cold ones. After that, check (and double check!) your component values, check for solder bridges etc... If you want to narrow down the options, first read the Rules For Getting Tech Help, and then re-post add to your post accordingly. Good luck!

Paul

When wiring it up I followed the Madbeans Standard wiring diagram and Ive checked that several times. I normally as a rule go over all of my solder joints as I go then check them again ones Im completely done, but Ill go through them again and also check all of the values ( Sorry I read the rules when I first started here but forgot about checking the values).

Check your resistor values, you may have gotten a batch of mislabeled. Secondly are you powering from battery or adapter. You still get power with no cable with an adapter but not with battery. Off board wiring is correct?

Jimi the Chunk Chunk is not wired for a battery but the other pedal that Im having the same problem with is wired for both and has the issue on both.


Thank you both Ill come back when I have more info.

[jimilee]

First, check your wiring against Madbeans Standard wiring diagram. Next, check all your solder joints for any cold ones. After that, check (and double check!) your component values, check for solder bridges etc... If you want to narrow down the options, first read the Rules For Getting Tech Help, and then re-post add to your post accordingly. Good luck!

Paul

When wiring it up I followed the Madbeans Standard wiring diagram and Ive checked that several times. I normally as a rule go over all of my solder joints as I go then check them again ones Im completely done, but Ill go through them again and also check all of the values ( Sorry I read the rules when I first started here but forgot about checking the values).

Check your resistor values, you may have gotten a batch of mislabeled. Secondly are you powering from battery or adapter. You still get power with no cable with an adapter but not with battery. Off board wiring is correct?

Jimi the Chunk Chunk is not wired for a battery but the other pedal that Im having the same problem with is wired for both and has the issue on both.


Thank you both Ill come back when I have more info.

Stereo jacks on the input?

[dog4107]

Yep

[nzCdog]

Pics would help, and if you have a multimeter, voltage readings of the Jfet legs

[dog4107]

Sorry for taking so long to reply but I figured out the main issue.

Due to a skechy borrowed muti meter the trim pots were set at to high of a voltage. Got them set at the right voltage and it works great.

Still have the 2nd issues though where the unit doesn't power off when the input cable is unplugged.
Heres a picture of the wiring if anyone can see the issue.

[jimilee]

Your second issue is supposed to happen,they all do this. Helps tremendously when you're testing it. But even my BYOC pedals stay on when powered with an adapter and not a battery. Glad you got this first issue straight,it's a heavy pedal. I built one and now why I know it's called a chunk chunk,cause that's the sound the pedal makes for sure!

[dog4107]

Your second issue is supposed to happen,they all do this. Helps tremendously when you're testing it. But even my BYOC pedals stay on when powered with an adapter and not a battery. Glad you got this first issue straight,it's a heavy pedal. I built one and now why I know it's called a chunk chunk,cause that's the sound the pedal makes for sure!

Yea its a great pedal but no where near as chunky as my Zoom driver pedal. I was hoping the Chunk Chunk was going to be its replacement so I could retired the poor old thing. Oh well!

[jimilee]

Your second issue is supposed to happen,they all do this. Helps tremendously when you're testing it. But even my BYOC pedals stay on when powered with an adapter and not a battery. Glad you got this first issue straight,it's a heavy pedal. I built one and now why I know it's called a chunk chunk,cause that's the sound the pedal makes for sure!

Yea its a great pedal but no where near as chunky as my Zoom driver pedal. I was hoping the Chunk Chunk was going to be its replacement so I could retired the poor old thing. Oh well!

Really? That must be some zoom pedal then for sure. Check out the klones over at grind customs then,those are even more metal. \m/