The oscillator will swing between the transistor’s breakdown open and close voltages, which will result in a fairly high DC offset; see the oscilloscope picture here for an example:
(that specific build swings between 7.4 and 10.7 volts, which corresponds to a DC offset of almost exactly 9 V)
Depends on your mixing desk if that’s a problem. If you have an AC coupled input with ok headroom you can just plug it in as is. To filter, you can try anything from, say, 100 nF upwards. Line inputs are high impedance, so you shouldn’t need big capacitors.
So I will try a few cap values from 100nf upwards. Am I correct that this should be in series from that 100K on the output? Is a bleed resisot rto ground from the coupling cap necessary also?
Hello there, i just build it, but i have an issue, my knob begins to pitch from the half way and to the end, before the half its just silence
i am using B10k knob.
That’s pretty much normal. Maybe with some adjustment to the circuit there would be sound over the whole pot range (maybe?) but probably no larger pitch range, just the same range spread over the whole pot travel.
, do you have any idea from where to start the adjustment ( I am a full beginner) thanks a lot!