I built a phase shift oscillator and now I want to turn the output of the oscillator on and off using a pulse, generated with the NE555 IC.
I am trying to do this using a BJT. I connected the oscillator output as Vcc and the pulse to Vb.
I got more or less the short sinusoidal pulse that I wanted but as you can see the output only follows Vcc for values larger than -Vce. I have only used BJT's with DC values for VCC so I am not really sure how to redesign this circuit in order to get the output to follow Vcc for larger negative values.
So my questions are:
1) Is it possible to get what I want using a BJT?
2) If it is possible how should I redesign my circuit?