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Old 16th February 2006, 01:55 AM   (permalink)
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Originally Posted by Ron H
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Originally Posted by panic mode
also changing transistor to PNP and reversing polarity of C1, M1 and battery will convert it to truth detector :wink:
:lol: :lol: :lol:

When you tell the truth, sweat (moisture and salt) gets sucked back into your sweat glands. I'm told that, if you are ever caught in a thunderstorm, you should recite every truth you know. This will increase your skin resistance and make you immune to lightning. Unless it's raining.
Maybe that's why golfers always get struck on the fairway....too busy lying about the drive... :lol:
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Old 16th February 2006, 02:05 AM   (permalink)
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Originally Posted by theinfamousbob
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Originally Posted by Ron H
Quote:
Originally Posted by panic mode
also changing transistor to PNP and reversing polarity of C1, M1 and battery will convert it to truth detector :wink:
:lol: :lol: :lol:

When you tell the truth, sweat (moisture and salt) gets sucked back into your sweat glands. I'm told that, if you are ever caught in a thunderstorm, you should recite every truth you know. This will increase your skin resistance and make you immune to lightning. Unless it's raining.
Maybe that's why golfers always get struck on the fairway....too busy lying about the drive... :lol:
:lol: :lol:
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Old 24th March 2006, 10:17 AM   (permalink)
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plz help i didnt understand where the wire join to the r2 risisteor :cry: :cry: :cry: :cry: :cry: :cry:
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Old 24th March 2006, 10:23 AM   (permalink)
akg
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plz help i didnt understand where the wire join to the r2 risisteor :cry: :cry: :cry: :cry: :cry: :cry:
R2 is a variable resistor(trim pot) , it has 3 legs , the arrow shown is the middle terminal of the variable resistor.
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Old 10th April 2006, 08:36 AM   (permalink)
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please give me a substitution for the transistor
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Old 10th April 2006, 02:30 PM   (permalink)
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Originally Posted by nikhil_nrao
please give me a substitution for the transistor
You can use any general purpose, small-signal NPN. I would use 2N3904, but there are many other suitable transistors available.
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Old 20th April 2006, 08:27 AM   (permalink)
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Originally Posted by ElectroMaster
Here's a simple lie detector that can be built in a few minutes, but can be incredibly useful when you want to know if someone is really telling you the truth. It is not as sophisticated as the ones the professionals use, but it works. It works by measuring skin resistance, which goes down when you lie.
How can I connect the transimpedance amplifier (attached) to the circuit above so the reading can be done with more ease?
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File Type: gif transimpedance_opamp.gif (1.3 KB, 117 views)
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Old 26th April 2006, 02:05 PM   (permalink)
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someone can telling me how does it work? cos i not so clear about it working.. hehe..
can use msn chat with me?
ljung_ng@hotmail.com
thx...
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Old 27th April 2006, 05:48 AM   (permalink)
akg
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Originally Posted by haka
someone can telling me how does it work? cos i not so clear about it working.. hehe..
can use msn chat with me?
ljung_ng@hotmail.com
thx...
read the first post
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Old 27th April 2006, 06:31 AM   (permalink)
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Anyone know how I can attach the transimpedance amp to that circiut? (2 posts above)

Thanx.
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Old 27th April 2006, 12:10 PM   (permalink)
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Originally Posted by akg
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Originally Posted by haka
someone can telling me how does it work? cos i not so clear about it working.. hehe..
can use msn chat with me?
ljung_ng@hotmail.com
thx...
read the first post
cos i still not sure for it circuit.. so any1 can helping me?
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Old 27th April 2006, 01:50 PM   (permalink)
akg
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Originally Posted by haka
cos i still not sure for it circuit.. so any1 can helping me?
it just measures/ shows the variation in the skin resistance(aka galvanic skin resistance) .when we lie , biological changes occur in our causes perspiration , so that the skin resistance goes low .
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Old 11th June 2006, 08:36 PM   (permalink)
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Hi all, Noob here, just wondering if you can tell me what size wire I need to use?
I have some 30awg solid, will this work? Thanks
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Old 13th June 2006, 08:38 PM   (permalink)
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Hi all, Noob here, just wondering if you can tell me what size wire I need to use?
I have some 30awg solid, will this work? Thanks
Yes. It needs to be insulated except where connections are made.
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Old 15th June 2006, 01:43 AM   (permalink)
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Cool, thnx Ron.
I'll post a pic once I am done and get it working.
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