Gaussmeter Kit Group-Buy

[David Schwab]

I'm now interested in getting the higher range hall sensor if anyone else wants to join me.

Yeah, me too. That's why I was inquiring about the AD22151.

[defaced]

I'm now interested in getting the higher range hall sensor if anyone else wants to join me.

I'm always a fan of options (rather have and not need it...), so count me in.

[-Elepro-]

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.

with my two gaussmeter (and two probe) i never saw "out of range" with alnico 5 rods (and my are 1200 gauss too).... also i tryed now with two magnet put togheter as in jazz bass but "out of range" doesn't appear

I'll go from 71 gauss directly to "out of range" as if there was no in between. This a repeatable event.

this is surely a defect....

- 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

[RedHouse]

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...

Sounds like you had hooked the sensor up with pins 1 & 3 switched at some point. Look closely at page 6 of this thread.

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

[David King]

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.

- 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

My probe wire is 6" long so I'll install the cap and test it out again.

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.

[spy]

Woohoo, a bet on who's gonna get it LAST! I LOVE IT!!!!

I bet it's gonna be ME!

Pepe you're too smart! A bet on who's gonna get it LAST?!?!?! And you bet that's it's gonna be YOU?!

Anyway I got it first! Woohoo.....

Thanks Brad!

[RedHouse]

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.



My probe wire is 6" long so I'll install the cap and test it out again.

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.

Dave, check your PM's

[52 Bill]

Currently DigiKey has 78 - Ad22151 chips in stock for $5.50 each.

[David Schwab]

Currently DigiKey has 78 - Ad22151 chips in stock for $5.50 each.

I'm not seeing that. They all say Non-Stock:

Product marked with non-stock in the "Minimum Quantity" column is typically not stocked. This product is available for purchase but because of its limited customer base is usually subject to higher minimum quantities. Digi-Key's rationale for offering non-stocking product follows:

Digi-Key Part Search


You have a link?

[peskywinnets]

Currently DigiKey has 78 - Ad22151 chips in stock for $5.50 each.

Hmm...they must have sold all 78 units in the past 20 minutes!

Digi-Key Part Search

[David Schwab]

Hmm...they must have sold all 78 units in the past 20 minutes!

Digi-Key Part Search

I had checked them Tuesday and they didn't have any listed either... same as today.

[52 Bill]

Hmm...they must have sold all 78 units in the past 20 minutes!

Digi-Key Part Search

Duh!
NEWARK has them. Sorry for the screw up.

[Dave Kerr]

Is this the right one? 2 in stock at Allied.

[David Schwab]

Is this the right one? 2 in stock at Allied.

That's the one.

[David Schwab]

Duh!
NEWARK has them. Sorry for the screw up.

ANALOG DEVICES|AD22151YRZ|Hall Effect Sensor IC | Newark.com

It's a bit cheaper from Allied.