ADA Depot Too - A Forum To Support Users of ADA Amplification Gear

Please login or register.

Login with username, password and session length
Advanced search  

News:

Let us never forget our beloved founder - RIP Jurrie, we all miss you very much

Pages: [1]   Go Down

Author Topic: Troubleshooting hum and weird microphonics  (Read 2354 times)

0 Members and 1 Guest are viewing this topic.

DesmoBob

  • Newbie
  • *
  • Offline Offline
  • Posts: 47
    • View Profile

I made a custom pedal board. I have a 1/4" input jack for the guitar on the right side. The jack is connected via patch cable to the first pedal in the chain.

If I plug my guitar directly into the first pedal in the chain (i.e., bypass the jack on the side), all is well.

However, whenever I use the jack, the patch cable goes loudly microphonic, as do all the other patch cables between the pedals. There is also a loud hum. Do I need to put a filter on the jack? Is the jack itself functioning as some kind of bad buffer? Or is this a symptom of some other problem?

Originally, I had the input jack, plus a wireless receiver. Using a DPDT rocker switch, I could choose which signal (jack or receiver) I could feed into the first pedal. However, any time I switched to the jack input, I got the loud cable microphonics and hum. For now, to make it simple, I completely removed the switch & receiver from the circuit. The point I'm at now is just trying to get the jack to play nicely, period.
« Last Edit: Time Format by DesmoBob »
Logged

Systematic Chaos

  • Administrator
  • Hero Member
  • *****
  • Offline Offline
  • Posts: 575
  • Blood type: Becks Positive
    • View Profile
Re: Troubleshooting hum and weird microphonics
« Reply #1 on: Time Format »

I guess the jack is the problem/issue....some grounding or other probably.
For your application I highly recommend these:
http://www.neutrik.com/en/audio/plugs-and-jacks/locking-1/4-chassis-jacks/nj3fp6p-bag

Logged
Fractal AxeFX II, Rocktron Velocity 150; DigiTech  2120Artist,Carvin Tube 100, Roland FC200//
Ibanez RGR620TKS, Ibanez RGR620TPS, Ibanez RG550Ltd BK, Ibanez RG7620MSOL, Ibanez RGR465MCA, Ibanez RGR765RCB, Ibanez RG620QMSP, Ibanez RG1420FBHB, Ibanez RGT42MDX, 90s ESP M-II Dlx //
DiMarzio CrunchLab/Evolution/Liquifire/AirNorton/HfH pups

rnolan

  • Administrator
  • Hero Member
  • *****
  • Offline Offline
  • Posts: 4368
    • View Profile
Re: Troubleshooting hum and weird microphonics
« Reply #2 on: Time Format »

I'm with SC here, that jack seems to have issues, replace it, make sure you have good "shielded" connection to the first pedal (or just plug straight into the first pedal (for now  >:D )
Logged
Studio Rig: MP2/MB1 > Eurorack UB2442FX-Pro > TC M-One XL > Behringer Truths (with Truth Sub) / QUAD ESL 63s
Live Rig: MP2/MB1 > Alesis Quadverb > Alesis Midiverb 4 > Yamaha AM802 > B200s/Carvin TS100/DCM200L > ADA Split Stacks/Mesa P112s

DesmoBob

  • Newbie
  • *
  • Offline Offline
  • Posts: 47
    • View Profile
Re: Troubleshooting hum and weird microphonics
« Reply #3 on: Time Format »

Thanks, I'll give that a try. I was able to source the NJ3PF6C, but not the NJ3PF6P (metal housing as opposed to plastic housing). Do you think it would matter?

(Currently I'm using a switchcraft jack.)
Logged

Systematic Chaos

  • Administrator
  • Hero Member
  • *****
  • Offline Offline
  • Posts: 575
  • Blood type: Becks Positive
    • View Profile
Re: Troubleshooting hum and weird microphonics
« Reply #4 on: Time Format »

The metal one will do just fine..I personally prefer the plastic housing ones for pedalboard/patchbay/rack installation though....
Logged
Fractal AxeFX II, Rocktron Velocity 150; DigiTech  2120Artist,Carvin Tube 100, Roland FC200//
Ibanez RGR620TKS, Ibanez RGR620TPS, Ibanez RG550Ltd BK, Ibanez RG7620MSOL, Ibanez RGR465MCA, Ibanez RGR765RCB, Ibanez RG620QMSP, Ibanez RG1420FBHB, Ibanez RGT42MDX, 90s ESP M-II Dlx //
DiMarzio CrunchLab/Evolution/Liquifire/AirNorton/HfH pups

rnolan

  • Administrator
  • Hero Member
  • *****
  • Offline Offline
  • Posts: 4368
    • View Profile
Re: Troubleshooting hum and weird microphonics
« Reply #5 on: Time Format »

Hey SC, do the plastic ones earth to the case ? if not (which is what I suspect) it reduces the possibility of ground loop isses and so would definitely be better, but depends on how you are setting up your pedal board ground plane (there maybe some scenarios where you want everything to earth to the case ?).
Logged
Studio Rig: MP2/MB1 > Eurorack UB2442FX-Pro > TC M-One XL > Behringer Truths (with Truth Sub) / QUAD ESL 63s
Live Rig: MP2/MB1 > Alesis Quadverb > Alesis Midiverb 4 > Yamaha AM802 > B200s/Carvin TS100/DCM200L > ADA Split Stacks/Mesa P112s
Pages: [1]   Go Up