Transistor configuration - need explanation and answers

[renzworldc]

transistor config.

Can anybody tell me the congifiguration of the transsistor in this circuit(lie detector circuit).. If m nt worng... its a common collector! and what kind of biasing is done to it? and whats the need of the capacitor there???
plz reply..

 

[graciousparul]

Re: transistor config.

Hi

Capacitor is used due to following reasons:

Capacitor functions as a smoothing capacitor and removes the 50Hz induced mains hum that is found on a person's body

I suggest u to go to this link for more details ...

**broken link removed**

 

[integralx2]

transistor config.

yep he is right its used to remove a certain frequency

 

[Audioguru]

Re: transistor config.

You do not need two batteries and you don't need that old transistor for the very simple ohm-meter circuit.