|
09-01-2009, 01:57 AM
| #351 | |
| Senior Member Join Date: Dec 2008
Posts: 160
| Quote:
| |
|  |
| ...and now, a word from our sponsor: |
| |
|
09-01-2009, 02:59 AM
| #352 | |||
| Senior Member  Join Date: Jun 2006
Posts: 684
| Quote:
Quote:
I'd recommend at least a 6" lead with the sensor bent at a 90° angle, this way you can measure pickups while they are still mounted in their host guitar, and six inches being long enough to keep the box fairly away from scratching the guitar's finish in case of a slip. Quote:
Our circuit board is slightly larger in dimensions than the LCD module due to the way they connect together and the way one single trace has to go around the top across the header.
__________________ -Brad (this is where stuff goes that nobody wants to read) ClassicAmplification.com Last edited by RedHouse; 09-01-2009 at 03:21 PM. | |||
|
| |
| The Following 2 Users Say Thank You to RedHouse For This Useful Post: | automan (09-02-2009), David Schwab (09-01-2009) |
|
09-01-2009, 04:03 AM
| #353 |
| Junior Member Join Date: Jul 2009
Posts: 15
| Thanks Brad
Got mine yesterday. I'm going to be using about a 30" lead so I can leave it on the shelf above my guitar building/repair bench. Thanks Brad |
|
| |
|
09-01-2009, 05:50 AM
| #354 |
| Senior Member Join Date: May 2006 Location: Boston, MA area
Posts: 1,181
|
It came today. Now for some soldering.
|
|
| |
|
09-01-2009, 07:03 AM
| #355 | |
| Pickup Maker  Join Date: May 2006 Location: Montclair, NJ
Posts: 4,974
| Quote:
563-PBS-11327-B The photo is wrong though. It's not wedge shaped. | |
|
| |
|
09-01-2009, 08:40 AM
| #356 | |
| Senior Member  Join Date: Apr 2009
Posts: 217
| Quote:
short wire improve reading stability bye
__________________ .......my gaussmeter project..... schematic & pcb ........ .......first pickup with my cnc winder........ | |
|
| |
| The Following User Says Thank You to -Elepro- For This Useful Post: | RedHouse (09-01-2009) |
|
09-01-2009, 02:56 PM
| #357 | |
| Senior Member  Join Date: May 2006
Posts: 344
| Quote:
| |
| |
|
09-01-2009, 04:13 PM
| #358 |
| Pickup Maker Join Date: May 2006 Location: Montclair, NJ
Posts: 4,974
|
I have a question for anyone who has an answer.... Elepro mentioned you can use an AD22151 sensor for reading strong magnets like neodymium. I was thinking of using both sensors, either making the sensor probe swappable, or building them both in the case and using a switch to select between the two. I just can't seem to find any AD22151s out there. Anyone know where to get one, or something compatible. Thanks in advance! |
|
| |
|
09-01-2009, 04:17 PM
| #359 | |
| Senior Member Join Date: Jun 2006
Posts: 684
| Quote:
Be aware that there are few more supporting parts for that sensor (see data sheet)
__________________ -Brad (this is where stuff goes that nobody wants to read) ClassicAmplification.com | |
|
| |
|
09-01-2009, 04:27 PM
| #360 | ||
| Pickup Maker Join Date: May 2006 Location: Montclair, NJ
Posts: 4,974
| Quote:
 Quote:
 [edit] Now I see I even looked at that part and thought it was the wrong one because of the SOIC case. | ||
|
| |
|
09-01-2009, 06:19 PM
| #361 |
| Senior Member Join Date: Jun 2007
Posts: 1,125
|
Kit arrived yesterday and after a few hours of building I now have a working Gaussmeter! RedHouse: Really great job on the kits, instructions and user manual! You really deserve a standing O from this crowd. A couple of questions/observations, I find that the sensor placement for taking readings is very touchy. I would strongly suggest having it mounted to a lead so that it can be easily moved around the magnet to find the sweet spot. Having the peak reading mode makes it a lot easier to deal with this. I just grabbed a J-Bass PU that I had handy and took some readings and found that the North poles read stronger than the South poles of each magnet. Is this normal? Again Thanks to all who helped make this happen! |
|
| |
|
09-01-2009, 08:58 PM
| #362 |
| Member Join Date: Jan 2009
Posts: 34
|
Here is the data sheet for the display. It gives you the viewing area size (for when you make your enclosure), ect. http://www.newhavendisplay.com/specs...-FSB-FBW-L.pdf |
|
| |
| The Following User Says Thank You to JasonG For This Useful Post: | David Schwab (09-01-2009) |
|
09-01-2009, 09:43 PM
| #363 | |
| Senior Member Join Date: Apr 2009
Posts: 217
|
ad22151 is only in SOIC package Quote:
pin4 at gnd, pin8 at 5V , and pin5 and pin6 put togheter are the output....... like for A1302 the 0,1uF capacitor is suggested if you have probe with long wire if you want wait i will test this solution when come back from holiday.....  bye
__________________ .......my gaussmeter project..... schematic & pcb ........ .......first pickup with my cnc winder........ | |
|
| |
|
09-01-2009, 09:49 PM
| #364 | |
| Pickup Maker Join Date: May 2006 Location: Montclair, NJ
Posts: 4,974
| Quote:
| |
|
| |
|
09-01-2009, 10:09 PM
| #365 |
| Senior Member Join Date: May 2006 Location: PDX
Posts: 1,017
|
I got mine up and running this morning but had a little trouble getting the right connections to the sensor. Look carefully at that diagram!
|
|
| |
|
09-02-2009, 01:17 AM
| #366 | ||||
| Senior Member Join Date: Jun 2006
Posts: 684
| Quote:
Quote:
Quote:
 Quote:
__________________ -Brad (this is where stuff goes that nobody wants to read) ClassicAmplification.com | ||||
|
| |
|
09-02-2009, 02:24 AM
| #367 |
| Senior Member Join Date: May 2006 Location: PDX
Posts: 1,017
|
I just wanted to re-post the instructions again... Building the Elepro Gaussmeter I'm wanting to set the probe calibration but the instruction PDF http://classicamplification.net/Gaus...ssMeter_v2.pdf isn't very explicit about how to do this. There was a number on my probe on the blue tape, is this the number I enter? Last edited by David King; 09-02-2009 at 02:32 AM. |
|
| |
|
09-02-2009, 03:10 AM
| #368 | |
| Senior Member Join Date: Jun 2006
Posts: 684
| Quote:
Page-4 of the PDF file, I tried to describe the proceedure to calibrate the unit to the sensor, I must not have been successful so let me try again here.... When you power up the unit (turn on power switch) you then immediately press and hold both the two pushbutton switches . Hold them down until the LCD screen reads "Calibration ...Probe1...Ok" as seen on the first picture on page-4 of the PDF file. If you pressed button-1 now it would toggle between Probe1 and Probe2, that is how you get access to the Probe2 area to calibrate it. Since we are only setting calibration on probe1 there is no need to press button1 at this time so just press button-2 which means "Ok" or accept Probe1. The LCD will change to read "Calibration...1.300mV/G ", it is now that you use button-1 to raise the value, or button-2 to lower the value mV/G. Note: it will actually read whatever was last entered-in before, if this was a real instruction manual it would have read like "Calibration...x.xxxmV/G" You will now use buttons 1-2 until you have the number I printed on your blue tape (attached to your sensor) showing on the LCD display. Think of it like using the channel-up/down buttons (+/-) on your TV Then you will release the buttons and wait a short time until the display changes to "Store Value? ....Y/N" you will press button-1 for yes or button-2 for no. After you accept or decline to store the setting the unit will re-boot and be ready to make readings.
__________________ -Brad (this is where stuff goes that nobody wants to read) ClassicAmplification.com Last edited by RedHouse; 09-02-2009 at 03:56 AM. | |
|
| |
| The Following 4 Users Say Thank You to RedHouse For This Useful Post: |
|
09-02-2009, 03:28 AM
| #369 |
| Senior Member  Join Date: Jul 2006
Posts: 192
| Thanks Everyone
Thanks Brad; I know this had to take up a lot of your time. It had to be an outstanding effort on your part for this all to go so smoothly. Thanks Elepro; Without your excellent design work, and you being so kind to share it with us, none of this would have been possible. Thanks to All in the group buy; It was very cool to be involved in this. |
|
| |
|
09-02-2009, 03:49 AM
| #370 | |||
| Senior Member Join Date: Jun 2006
Posts: 684
| Quote:
Quote:
Quote:
I'd like to thank Elepro ...ciao... for doing all the hard work. I'd like to thank Bruce Johnson for his fine contribution with the stand-off's, spacers, screws, and how he had 'em all baged-up really helped me out. I'd like to thank Jason and Stephanie Lollar, and Wolfe McLeod for all their help with the meter comparison tasks and being the kind hosts that they are. I'd like to thank my wife because she stood by me all the way through this and really doesn't care what a gauss meter is.  I'd like to thank Tanquarey & Schweps for their fine contribution along with Bogle and St Michelle and...and...and... thank the good lord too because every day is a bonus at this stage . . .
__________________ -Brad (this is where stuff goes that nobody wants to read) ClassicAmplification.com Last edited by RedHouse; 09-02-2009 at 04:00 AM. | |||
|
| |
|
09-02-2009, 04:06 AM
| #371 | |
| Senior Member Join Date: Jun 2006
Posts: 684
| Quote:
__________________ -Brad (this is where stuff goes that nobody wants to read) ClassicAmplification.com | |
|
| |
|
09-02-2009, 07:22 AM
| #372 |
| Senior Member Join Date: Jun 2006
Posts: 684
|
My gauss meter all boxed-up, this is a SerPac "S series" 321-I box: (like this: SerPac at Allied Elec)  Had to cut out the inner battery box to make it fit though, you can see how the battery needs to be all the way over to the wall to make room for the gaussmeter assembly. The inner box takes up nearly 1/3 the available room inside the box, I also had to clip off two of the built in board mounting lands that were in the way of the toggle switches. This is what the inner battery box looked like before I removed it:  That should be a good season opener for the show-n-tell section of this group-buy adventure!
__________________ -Brad (this is where stuff goes that nobody wants to read) ClassicAmplification.com |
|
| |
|
09-02-2009, 07:42 AM
| #373 | ||
| Senior Member Join Date: Apr 2009
Posts: 217
| Quote:
Quote:
R2 and R3 are for gain selection.... but we need gain =1 (0.4mV/Gauss) then R3 must be 0 (pin5 and pin6 put togheter) and R2 doesn't need.... R4 is for offset... but for us it's ok Vcc/2 @ 0 gauss (without R4 resistor) ....but datasheet is not very clear then i will try (in the second half of september when i come back from holiday ) tanks at all bye
__________________ .......my gaussmeter project..... schematic & pcb ........ .......first pickup with my cnc winder........ | ||
|
| |
| The Following 3 Users Say Thank You to -Elepro- For This Useful Post: |
|
09-02-2009, 07:48 AM
| #374 |
| Pickup Maker Join Date: May 2006 Location: Montclair, NJ
Posts: 4,974
|
Brad, that looks good! Similar case to what I'm getting, and I think I'll have to do similar shenanigans inside the box. I got mine all put together, but left the display board and PIC in their protective bag/sleeve until I get the case, which will be in the next couple of days. I'm also deciding on how I want to do the probe... Now I'm thinking of a removable one, kind of the like the Elepro version, but not as long. Nice the about having a calibrated sensor, is I can then calibrate the other sensor using a known magnet. By the way, your circuit board was very nice to work with, as were Bruce's hardware. Very professional. |
|
| |
| The Following User Says Thank You to David Schwab For This Useful Post: | RedHouse (09-02-2009) |
|
09-02-2009, 07:10 PM
| #375 |
| Senior Member Join Date: May 2006 Location: PDX
Posts: 1,017
|
I keep getting "out of range" on alnico-5 magnets (in peak hold mode, usually around 1650g) is that normal? Most of my .188" x .850" magnets measure 1200 or so but when two are side by side, as in a Jazz bass PU the "out of range" pops up pretty frequently. I also get it on ceramics but it's more like a random event. I'll go from 71 gauss directly to "out of range" as if there was no in between. This a repeatable event. I did re-calibrate for my sensor which was way up at 1482. Is anyone else have this problem yet? I'm now interested in getting the higher range hall sensor if anyone else wants to join me. |
|
| |
|
09-02-2009, 08:44 PM
| #376 | |
| Pickup Maker Join Date: May 2006 Location: Montclair, NJ
Posts: 4,974
| Quote:
| |
|
| |
|
09-02-2009, 10:49 PM
| #377 | |
| Senior Member  Join Date: Dec 2006 Location: York Pa
Posts: 492
| Quote:
__________________ -Mike | |
|
| |
|
09-02-2009, 11:35 PM
| #378 | ||
| Senior Member Join Date: Apr 2009
Posts: 217
| Quote:
Quote:
- are you sure there is not short circuit in sensor pin? - how many long are wire of probe? - if you are wire in your probe (more than 2") try to put 0.1uF capacitor between +5v and gnd near sensor pin - check any soldering if this defect persist then try to measure out sensor voltage during these events... bye
__________________ .......my gaussmeter project..... schematic & pcb ........ .......first pickup with my cnc winder........ Last edited by -Elepro-; 09-02-2009 at 11:42 PM. | ||
|
| |
|
09-03-2009, 01:17 AM
| #379 | |
| Senior Member Join Date: Jun 2006
Posts: 684
| Quote:
The first time I built the probe wire I had mine hooked up wrong, it had those exact symptoms, I had to toss it away and use another A1302. Hooked it up correctly and never had the problem again, and that is why I tried to emphasize the wiring hookup in the PDF file. The tell-tale sign is the "out of range" message. While Elepro did a wonderful job on the PIC, it doesn't check the probe lines for correct hookup, it assumes you have it right and when it doesn't get the signals it's expecting it says "out of range". Likely the output pin (pin-3) and the V+ pin (pin-1) were switched at some point. If in doubt look closely at the picture I posted in the thread (page 6 of this thread) where Elepro said to be careful of the hookup: close-up
__________________ -Brad (this is where stuff goes that nobody wants to read) ClassicAmplification.com | |
|
| |
|
09-03-2009, 02:19 AM
| #380 | |
| Senior Member Join Date: May 2006 Location: PDX
Posts: 1,017
|
Thanks Elepro and Red house, Yes, I had momentarily switched the Ground with the Output leads on first assembly but made sure I got the Supply to the right pin knowing that was the important one for component longevity. Quote:
Oh BTW Digikey seems to be out of the AD22151 I found some on EBay for $14 ea which is a lot to pay for a $4 part. I'll try the standard sample request route and see what happens. | |
|
| |
|
09-03-2009, 11:02 AM
| #381 | |
| Member  Join Date: Feb 2009 Location: Athens, Greece
Posts: 94
| Quote:
Anyway I got it first! Woohoo.....  Thanks Brad! | |
|
| |
| The Following User Says Thank You to spy For This Useful Post: | RedHouse (09-03-2009) |
|
09-03-2009, 03:38 PM
| #382 | |
| Senior Member Join Date: Jun 2006
Posts: 684
| Quote:
__________________ -Brad (this is where stuff goes that nobody wants to read) ClassicAmplification.com | |
|
| |
|
09-03-2009, 07:38 PM
| #383 |
| Senior Member Join Date: Jun 2007
Posts: 1,125
|
Currently DigiKey has 78 - Ad22151 chips in stock for $5.50 each.
|
|
| |
|
09-03-2009, 07:50 PM
| #384 | ||
| Pickup Maker Join Date: May 2006 Location: Montclair, NJ
Posts: 4,974
| Quote:
Quote:
You have a link? | ||
|
| |
|
09-03-2009, 07:51 PM
| #385 | |
| Member Join Date: Mar 2009 Location: London, UK
Posts: 46
| Quote:
Digi-Key Part Search | |
|
| |
 |
| Bookmarks |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
| Thread Tools | |
| Display Modes | |
| |
| ||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| Gaussmeter project | -Elepro- | Pickup Makers | 49 | 07-28-2009 04:56 PM |
| Any EU and UK people interested in a Group order from MWS? | corduroyew | Pickup Makers | 0 | 02-12-2008 08:39 AM |
| Where to buy Inductors? | clintronics | Music Electronics | 3 | 11-04-2007 01:41 PM |
| Would anybody buy flatwork? | chevalij | Pickup Makers | 45 | 07-20-2007 06:02 PM |
| FInally. Bought a Gaussmeter | WolfeMacleod | Pickup Makers | 19 | 01-06-2007 05:20 PM |
Linear Mode
