Hi,
I tried this circuit on NI Multisim which is of a colpitts oscillator and the circuit oscillated..
http://i53.tinypic.com/vpdgck.jpg
I used similar circuit on breadboard and it doesnt seem to oscillate...
I know that in this circuit the transistor is not well biased...
I used ceramic capacitors for C1 and C2 (the tank circuit caps) of same value..
I used a coil of 60 turns for the inductor L1 ( I used a wire with plastic coating and wound the coil.. I hope its allright.. and I calculated the value of inductance from Wheelers formula.. and also tried some other inductance calculating softwares and got it as 30uH)..
I didnt have an oscilloscope so what I did was to connect a capacitor(0.47 uF) and a diode(silicon type) in series at the emitter terminal and tried to measure the dc voltage part of oscillations(hope im right.. ) but the multimeter didnt show any readings...
Plz tell me in which area i could improve so that this circuit oscillates.. if this circuit oscillates, I will bias it properly next time with voltage divider bias method...
I dont care much about the frequency of oscillations... I just want it to oscillate.. so also tell me how to detect the oscillations.. Also tell me whether the feedback of my circuit is proper or not..
I know it is a big question posted by me.. thanks for help in advance..
I tried this circuit on NI Multisim which is of a colpitts oscillator and the circuit oscillated..
http://i53.tinypic.com/vpdgck.jpg
I used similar circuit on breadboard and it doesnt seem to oscillate...
I know that in this circuit the transistor is not well biased...
I used ceramic capacitors for C1 and C2 (the tank circuit caps) of same value..
I used a coil of 60 turns for the inductor L1 ( I used a wire with plastic coating and wound the coil.. I hope its allright.. and I calculated the value of inductance from Wheelers formula.. and also tried some other inductance calculating softwares and got it as 30uH)..
I didnt have an oscilloscope so what I did was to connect a capacitor(0.47 uF) and a diode(silicon type) in series at the emitter terminal and tried to measure the dc voltage part of oscillations(hope im right.. ) but the multimeter didnt show any readings...
Plz tell me in which area i could improve so that this circuit oscillates.. if this circuit oscillates, I will bias it properly next time with voltage divider bias method...
I dont care much about the frequency of oscillations... I just want it to oscillate.. so also tell me how to detect the oscillations.. Also tell me whether the feedback of my circuit is proper or not..
I know it is a big question posted by me.. thanks for help in advance..