Results 1 to 16 of 16

Thread: Humbucker phase testing

  1. #1
    Music Lover Sock Puppet's Avatar
    Join Date
    Aug 2006
    Location
    Northumberland U.K.
    Posts
    413
    Thumbs Up/Down
    Received: 0/0
    Given: 0/0

    Humbucker phase testing

    I put together a simple test bed for checking pickup coil phase - schematic to follow.

    Having checked for coil problems and establishing continuity of the coils, the coils Black/White and Red/Green are connected to the inputs.

    I haven't any idea how to put subtitles on the video so:

    0:08 Slug side (North) White is +Ve going w.r.t. Black
    0:15 Screw side (South) shows Green is +Ve going w.r.t. Red
    0:20 A satisfying clout shows both coils together

    Normally this pickup would be wired Black ground, Red+White together, Green hot. You could reverse the Green and Black here and swap the phase.

    It could also be wired with Green to Black and either White or Red to Ground etc if you need it.

    I won't bother with parallel wiring here.


    0 Not allowed! Not allowed!

  2. #2
    Supporting Member
    Join Date
    May 2006
    Location
    PDX
    Posts
    3,219
    Thumbs Up/Down
    Received: 5/0
    Given: 5/0
    So please tell us more about the circuit behind the curtain if you would.

    And also what brand of chisel you are using...

    0 Not allowed! Not allowed!

  3. #3
    Senior Member
    Join Date
    Feb 2015
    Posts
    120
    Thumbs Up/Down
    Received: 18/0
    Given: 0/0
    looks like a stanley or a buck :{>

    0 Not allowed! Not allowed!

  4. #4
    Music Lover Sock Puppet's Avatar
    Join Date
    Aug 2006
    Location
    Northumberland U.K.
    Posts
    413
    Thumbs Up/Down
    Received: 0/0
    Given: 0/0
    First off, the chisel is an Irwin.Marples 3/4" MS500 All-Purpose Chisels with Striking Cap - Tools - IRWIN TOOLS

    - though a steel rule works too.

    The circuit mess that was hiding has devolved and lost a few components since that video but currently looks a bit like this - I tried a couple of zeners across 12V for a single rail supply and tried 9-0-9 with LED resistors. There were also larger capacitors with 10M bleed resistors initially.

    As it stands now, it works well and the gate capacitors are discharged by leakage through the zeners. I like the zeners in place to help protect the mosfets. LED current is limited by the small batteries, max. current is under 6mA per side.

    Had a bit of trouble drawing the dots where connections are so it's not perfect (& not elegant either)

    Click image for larger version. 

Name:	hb schematic1.jpg 
Views:	228 
Size:	95.1 KB 
ID:	38277

    0 Not allowed! Not allowed!
    Last edited by Sock Puppet; 03-19-2016 at 03:04 AM.

  5. #5
    Supporting Member
    Join Date
    May 2006
    Location
    PDX
    Posts
    3,219
    Thumbs Up/Down
    Received: 5/0
    Given: 5/0
    Holy smokes, that looks so professional dots or no dots. Thanks for posting it! I didn't recognize the mosfet's symbols but I guess they are some sort of transistor or gate thing? Zeners are diodes that let current through above a certain voltage? It's been 35 years since the last electronics class I took in high school.
    i was thinking the caps were there to keep the LEDs on a little longer but it's more of a timer circuit than actual energy storage device.

    0 Not allowed! Not allowed!

  6. #6
    Senior Member
    Join Date
    Jan 2009
    Posts
    591
    Thumbs Up/Down
    Received: 0/0
    Given: 0/0
    Hi Sock puppet

    What happens when one of the coils is wired out of phase ?

    Cheers

    Andrew

    0 Not allowed! Not allowed!

  7. #7
    Music Lover Sock Puppet's Avatar
    Join Date
    Aug 2006
    Location
    Northumberland U.K.
    Posts
    413
    Thumbs Up/Down
    Received: 0/0
    Given: 0/0
    Yes, the capacitors are there to keep the LEDs on a short while and the zeners protect against any unwanted high voltages at the sensitive gates.

    The transistor symbols are enhancement mode MOSFETs, I just used what I had in the box with the N channel ones at the top being BUZ72L and the lower P channel was a dual one in a tiny package - APM4953.

    I was lucky to have these as they have a low threshold voltage on the base.

    I tried 16V zeners in today the LEDs are lit for longer, something to play with.

    The diagram was my first attempt with the free SchemeIt on the Digikey site here:

    http://www.digikey.com/schemeit/?la=en

    0 Not allowed! Not allowed!

  8. #8
    Music Lover Sock Puppet's Avatar
    Join Date
    Aug 2006
    Location
    Northumberland U.K.
    Posts
    413
    Thumbs Up/Down
    Received: 0/0
    Given: 0/0
    Quote Originally Posted by the great waldo View Post
    Hi Sock puppet

    What happens when one of the coils is wired out of phase ?

    Cheers

    Andrew
    Hi Andrew.

    From the video, the Green/Blue LED pair associated with that coil will be reversed, so the Blue will light when the chisel goes toward the pickup coil.

    Now reversing those coil leads would put the pickup in phase with Hot Positive Going (only way I can describe it)
    If instead you reverse the other coil so that the Blue LEDs light with chisel going towards the coils then the pickup will be in phase with Hot Negative Going.

    Hope that makes sense, looks like gibberish :-)

    0 Not allowed! Not allowed!

  9. #9
    Supporting Member
    Join Date
    May 2006
    Location
    PDX
    Posts
    3,219
    Thumbs Up/Down
    Received: 5/0
    Given: 5/0
    Would it be possible to refine the design with bi-colored LEDs, say Red/Green for in/out of phase? I'm not sure if the current is reversing direction here or not.

    My EE friend suggested I use an LM311 and send a test signal through the coils to check for phase at the output. I'm not well read enough to figure that all out but it might mean something to someone else.

    0 Not allowed! Not allowed!

  10. #10
    Senior Member
    Join Date
    Jan 2009
    Posts
    591
    Thumbs Up/Down
    Received: 0/0
    Given: 0/0
    Quote Originally Posted by David King View Post
    Would it be possible to refine the design with bi-colored LEDs, say Red/Green for in/out of phase? I'm not sure if the current is reversing direction here or not.

    My EE friend suggested I use an LM311 and send a test signal through the coils to check for phase at the output. I'm not well read enough to figure that all out but it might mean something to someone else.
    I would agree with that idea David.

    Cheers

    Andrew

    0 Not allowed! Not allowed!

  11. #11
    Music Lover Sock Puppet's Avatar
    Join Date
    Aug 2006
    Location
    Northumberland U.K.
    Posts
    413
    Thumbs Up/Down
    Received: 0/0
    Given: 0/0
    Meh... It's off my bench now.

    0 Not allowed! Not allowed!

  12. #12
    Woodgrinder/Pickupwinder copperheadroads's Avatar
    Join Date
    Jun 2009
    Location
    Iceburg Alley ,Newfoundland,CAN
    Posts
    2,074
    Thumbs Up/Down
    Received: 17/0
    Given: 9/0
    Quote Originally Posted by David King View Post
    And also what brand of chisel you are using...
    Now there's a Woodworker

    0 Not allowed! Not allowed!
    "UP here in the Canada we shoot things we don't understand"

  13. #13
    Woodgrinder/Pickupwinder copperheadroads's Avatar
    Join Date
    Jun 2009
    Location
    Iceburg Alley ,Newfoundland,CAN
    Posts
    2,074
    Thumbs Up/Down
    Received: 17/0
    Given: 9/0
    Wow nice project
    can i do up a layout on vero/stripboard & post it ?

    0 Not allowed! Not allowed!
    Last edited by copperheadroads; 03-25-2016 at 03:10 PM.
    "UP here in the Canada we shoot things we don't understand"

  14. #14
    Music Lover Sock Puppet's Avatar
    Join Date
    Aug 2006
    Location
    Northumberland U.K.
    Posts
    413
    Thumbs Up/Down
    Received: 0/0
    Given: 0/0
    Quote Originally Posted by copperheadroads View Post
    Wow nice project
    can i do up a layout on vero/stripboard & post it ?
    It's all yours, check your PM

    0 Not allowed! Not allowed!

  15. #15
    Supporting Member
    Join Date
    May 2006
    Location
    PDX
    Posts
    3,219
    Thumbs Up/Down
    Received: 5/0
    Given: 5/0
    I'm starting a new thread in the "tools/winders" section to see if we can launch a group project with this. I'd like so see a bit more functionality to this gizmo and perhaps if we put our heads together we could come up with a really useful tool that could become a groupbuy etc.

    0 Not allowed! Not allowed!

  16. #16
    Woodgrinder/Pickupwinder copperheadroads's Avatar
    Join Date
    Jun 2009
    Location
    Iceburg Alley ,Newfoundland,CAN
    Posts
    2,074
    Thumbs Up/Down
    Received: 17/0
    Given: 9/0
    Old thread i know but did any one build one & use it ?

    0 Not allowed! Not allowed!
    "UP here in the Canada we shoot things we don't understand"

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Three humbucker guitars and middle pickup phase.
    By Stratz in forum Pickup Makers
    Replies: 2
    Last Post: 09-12-2014, 01:22 AM
  2. Humbucker in parallel out of phase - octavia effect?
    By dwmorrin in forum Pickup Makers
    Replies: 9
    Last Post: 12-09-2013, 04:34 PM
  3. Phase of a humbucker?
    By rhgwynn in forum Pickup Makers
    Replies: 31
    Last Post: 04-05-2013, 03:10 PM
  4. In phase or out of phase for jumping channels
    By Dagan8 in forum Theory & Design
    Replies: 13
    Last Post: 12-23-2010, 02:05 PM
  5. Phase Inverter and Reverb Phase
    By Daver in forum Theory & Design
    Replies: 5
    Last Post: 08-21-2006, 04:25 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •