Simple Lie Detector - Page 3 - Electronic Circuits Projects Diagrams Free

theinfamousbob · 16th February 2006, 02:55 AM

Quote:

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:

Roff · 16th February 2006, 03:06 AM

Quote:

Originally Posted by theinfamousbob

Quote:

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:

gaith · 24th March 2006, 11:18 AM

plz help i didnt understand where the wire join to the r2 risisteor :cry: :cry: :cry: :cry: :cry: :cry:

akg · 24th March 2006, 11:23 AM

Quote:

Originally Posted by gaith

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.

nikhil_nrao · 10th April 2006, 09:36 AM

please give me a substitution for the transistor

Roff · 10th April 2006, 03:30 PM

Quote:

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.

electroniks · 20th April 2006, 09:27 AM

Quote:

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?

haka · 26th April 2006, 03:06 PM

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...

akg · 27th April 2006, 06:48 AM

Quote:

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

electroniks · 27th April 2006, 07:32 AM

Anyone know how I can attach the transimpedance amp to that circiut? (2 posts above)

Thanx.

haka · 27th April 2006, 01:11 PM

Quote:

Originally Posted by akg

Quote:

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?

akg · 27th April 2006, 02:51 PM

Quote:

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 .

Elektrohead · 11th June 2006, 09:37 PM

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

Roff · 13th June 2006, 09:39 PM

Quote:

Originally Posted by Elektrohead

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.

Elektrohead · 15th June 2006, 02:43 AM

Cool, thnx Ron.
I'll post a pic once I am done and get it working.

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24th March 2006, 11:18 AM	#33
gaith	plz help i didnt understand where the wire join to the r2 risisteor :cry: :cry: :cry: :cry: :cry: :cry:

10th April 2006, 09:36 AM	#35
nikhil_nrao	Re: Details of Parts please give me a substitution for the transistor

26th April 2006, 03:06 PM	#38
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...

27th April 2006, 07:32 AM	#40
electroniks	Anyone know how I can attach the transimpedance amp to that circiut? (2 posts above) Thanx.

11th June 2006, 09:37 PM	#43
Elektrohead	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

15th June 2006, 02:43 AM	#45
Elektrohead	Cool, thnx Ron. I'll post a pic once I am done and get it working.