Hello
I am trying to understand colpitt oscillators.
For example :
http://www.circuitstoday.com/colpitts-oscillator
or this one
http://www.falstad.com/circuit/e-colpitts.html
I can understand that the transistor is an inverting amplifier , that is 180 degree shift , and the LC tank circuit is frequency selector + phase shifter at the resonant frequency that is another 180 degree shift. So that makes it oscillate.
I can understand this much.
But why is the middle of capacitor C1 and C2 , grounded ?
I read that its called tapping and that ratio of C1 and C2 controls the amount of feedback fed back to transistor..
But what is this tapping , and what is the logic behind it ?
I read at some places that it provides a reference , but I still dont understand it.
Can somebody explain it in very simple terms ( I am a kid at this )
Regards
Silver
I am trying to understand colpitt oscillators.
For example :
http://www.circuitstoday.com/colpitts-oscillator
or this one
http://www.falstad.com/circuit/e-colpitts.html
I can understand that the transistor is an inverting amplifier , that is 180 degree shift , and the LC tank circuit is frequency selector + phase shifter at the resonant frequency that is another 180 degree shift. So that makes it oscillate.
I can understand this much.
But why is the middle of capacitor C1 and C2 , grounded ?
I read that its called tapping and that ratio of C1 and C2 controls the amount of feedback fed back to transistor..
But what is this tapping , and what is the logic behind it ?
I read at some places that it provides a reference , but I still dont understand it.
Can somebody explain it in very simple terms ( I am a kid at this )
Regards
Silver