is it possible that an oscillator(like LC oscillator or wien-bridge etc) create sound? i mean to connect buzzer or speaker to an oscillator to hear the sound?
Why? - a colpitts isn't constrained in any way - you just need the correct inductance and capacitance values.
However, it's certainly not a very good idea - and there are various better options for audio oscillators, including wien bridge as he mentioned, or phase shift as you did.
A Phase Shift Oscillator is an electronic oscillator circuit which produces sine wave output. It can either be designed by using transistor or by using an Op-amp as inverting amplifier.
my oscillator generates signal with 8 to 10mV output sine wave(LC oscillator, f=150KHz). But I need around 1V to 2V amplitude signal. I tried to amplify with simple BJT amplifier. Both the oscillator and the amplifier I am using has 5V power supply. With 9V power I get higher amplitude but still not high enough(1V to 2V).
- with the problem of sound I have another plan, just need the 150KHz signal with 1 to 2V amplitude
Are you really expecting to hear 150kHz?
ie listen to it with your ears?
The accepted upper frequency of human hearing is about 20kHz.
When I was 16 years old, I could hear 18kHz, 57 years later I can hear 5kHz on a good day.
1) You want 150 Khz for what reason ?
2) Waveform you want, sine, square, saw, tri.....?
3) We know you want 1 - 2 V.
4) What accuracy do you want ?
5) If sine do you care about distortion ? If yes your target.
6) As pointed out, you cannot hear 150 Khz, so is 150 Khz still what you want ?