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The Philippine Electronics and Technology Forum > General Electronics and Technology Discussion > General Electronics and Technology Discussion (Moderator: DyoodekS) > help about this circuit using AD620
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Author Topic: help about this circuit using AD620  (Read 174 times)
xTrenduz
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« on: February 18, 2011, 05:31:48 AM »
http://img228.imageshack.us/img228/8859/circuitv.jpg

pag lagyan ko ng load ang loadcell hindi po nag vavarry ung out put nya..
ung out voltage pala nya pag walang input ung in ay 1.17v pag nilagay ko na
ung load cell magiging 1.88v kaso pag nilagyan ung load ung load cell hindi taas ung voltahi..
anong mali po ba sa circuit ko?
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« on: February 18, 2011, 05:31:48 AM »
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motion55
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« Reply #1 on: February 18, 2011, 07:15:52 AM »
Pin 4 and 5 should have separate voltage rails (dual +5V and -5V supplies needed). Pin 4 is -5V rail (also the bottom end of the load cell). While pin 5 is ground.

Or following your circuit, you can connect pin 7 to +5V, pin 4 to ground and connect pin 5 to a 2.5V reference voltage.
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xTrenduz
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« Reply #2 on: February 18, 2011, 10:19:16 AM »
Quote from: motion55 on February 18, 2011, 07:15:52 AM
Pin 4 and 5 should have separate voltage rails (dual +5V and -5V supplies needed). Pin 4 is -5V rail (also the bottom end of the load cell). While pin 5 is ground.



split supply po ba ang gagamitin namin dyan na circuit?
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motion55
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« Reply #3 on: February 18, 2011, 10:53:12 AM »
Quote from: xTrenduz on February 18, 2011, 10:19:16 AM

split supply po ba ang gagamitin namin dyan na circuit?

Yes, either +/-5V or +/-2.5V. If the load cell needs 10V as the diagram suggested, then you have to use +/-5V rails. Connect the load cell's positive supply to +5V. Connect the load cell's negative end to -5V for a total supply of 10V. Connect pin 4 of the AD620 to -5V. pin 7 to +5V and pin 5 to 0V (ground).
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xTrenduz
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« Reply #4 on: February 18, 2011, 12:07:32 PM »
Quote from: motion55 on February 18, 2011, 10:53:12 AM
Yes, either +/-5V or +/-2.5V. If the load cell needs 10V as the diagram suggested, then you have to use +/-5V rails. Connect the load cell's positive supply to +5V. Connect the load cell's negative end to -5V for a total supply of 10V. Connect pin 4 of the AD620 to -5V. pin 7 to +5V and pin 5 to 0V (ground).



ito pa bang ung circuit na sinasabi nyo?

http://img130.imageshack.us/img130/8900/circuit2.jpg
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xTrenduz
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« Reply #5 on: February 18, 2011, 08:36:52 PM »
master nakuha ko na po ung tamang circuit..
tama po ung pin 5 lagyan ng 2.5v as voltage ref..
thanks po master..
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jere
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« Reply #6 on: November 12, 2011, 06:36:11 AM »
sir kailangan b ung source ng load cell (ung itim at red) ay +2.5v and - 2.5v?...ndi b pde ng +5v nlang tas ung isa nsa ground?
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zrehtiek/keitherz
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« Reply #7 on: November 12, 2011, 07:28:40 AM »
hindi, sa ibang pin yung ground.
+2.5v at -2.5v or 5v at -5v tapos yung pin 5 ay ground.
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