Gaussmeter project

[-Elepro-]

edit: list in link is wrong.... watch next post


ok, now list is complete.... there are not only connectors.... (here is for display)
display has black character so it's possible use it without backlight....
backlight has more current consumption than mine so i suggestion to change backlight switch with a push button..... (there are 3 button in list and 1 toggle switch for on/off)
R3 for this display is 15 ohm and trimmer R1 10k - 20k .... in list here's a 20kohm

hall sensor in list allow measure of about +/- 800 gauss (mouser has only this) then remove it if you want measure alnico and buy an A1302 on ebay.....

tomorrow i'll check list again

bye

[firewire]

List!

Cool!!!
That's good to know on the Hall sensor A1302 is the way to go!
Now all that would be need is a link to get you programed chip!!

[-Elepro-]

wait... i found correct display with low power backlight
but.... do not order yet!

[-Elepro-]

ok, this is definitive list


R1 - 10 kohm trimmer ---mouser has only one 20k of right dimensions...but it's ok 652-3318S-1-203

R2 - 5.6Kohm 1/4 watt 660-CF1/4C562J

R3 - 47ohm 1/4 watt (you can increase this value for decrease backlight intensity and have a more long life battery) 660-CF1/4CT52R470J

R4- 1Kohm 1/4 watt (this is for backlight dimmer) ---- not useful for display in this list

C1 - 330nF polyester ------ 505-MKS20.33/63/5
C2 - 100nF polyester ------- 505-MKS2.1/63/5T
C3 - 100nF polyester --------- 505-MKS2.1/63/5T
C4 - 100nF polyester (this is in the probe near sensor... watch photo...) ------- 505-MKS02.1/63/10

D1 - 1N4001 (or 02 03 04 05 06 07... is only for polarity inversion protection) ----- 625-1N4001-E3/54

IC1 - 7805T (5 volt voltage regulator) ----- 863-MC7805BTG
IC2 - A1302 (hall sensor) ----- mouser has only this but can measure +/-800 gauss..... not good for alnico ----- 828-OHS3150U
IC3 - PIC16F883 (microcontroller...... needs my software on it)---- contact me

1 X HD44780 compatible 16X2 (16 character X 2 row) lcd display (with positive voltage contrast) -----key in NHD-0216K1Z-FS select low power backlight and then choose color

2 X - normally open push button ------- 506-MSPS103C0
2 X - SPST switch ----------- 1055-TA2120-EVX
1 X - DIL28 narrow socket (for IC3) -------- 517-4814-3004-CP

1 X 9volt battery clip ------ 534-84-6

conn 1-2-3-4-6 - any 90° 2.54mm pitch connector (or you can solder wire directly in the pcb )

conn5 - ------ 517-929834-01-16 with 517-974-01-16

bye

[mickmutante]

How can I get the IC3-PIC16F883 with the program.?

[-Elepro-]

you have a private message....

[-Elepro-]

for who needs sensor

A1302 link

AD22151 link

[RedHouse]

How can I get the IC3-PIC16F883 with the program.?

Elepro, I'd like to know your details also, please PM me?

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Just out of curiosity, how many folks here would get a kit if I put together a group-buy scenario? if there is enough interest I will work out the details and prices after I get a response from Elepro.

[JasonG]

This looks like a great project but, being new the pickup winding I wonder how it compares with other units.

[salvarsan]

This looks like a great project but, being new the pickup winding I wonder how it compares with other units.

Sorta like, if you buy a commercial gaussmeter, it costs between 250 and 1000 USD and is overkill for pickup builders.


If you build Elepro's kit, you can probably keep the price under 100 USD and have something specifically intended for pickup builders.



-drh

[David Schwab]

Just out of curiosity, how many folks here would get a kit if I put together a group-buy scenario? if there is enough interest I will work out the details and prices after I get a response from Elepro.

Count me in.

[JasonG]

I would go for a group buy too. The lay out is so simple you might be able to get away with using vero board. I would not need the board but if it worked best for everyone to have a complete kit , I would buy a full kit.

[RedHouse]

The Who's-In on the Group Buy List:
Redhouse
David Schwab
JasonG

Ok so that makes three (3), anyone else?.

I will be start a new thread for posts regarding the group buy

[salvarsan]

PCB CAD files?

Are the gaussmeter board layout files available?
We can have circuit boards professionally made from board files.


-drh

[JasonG]

You might want to post stuff like this on the group buy post.
My guess is that there are plenty of guys around here who could cook up a board for you. Unless someone can make those boards at that level cheap I would think few people would find in advantages to make the board part of the kit. If we got a lot more people in on this the price per board would drop and it might be better to add it to the kit. But we will have to see what happens.