I’m trying to understand how the kinks noise generator works. I would love to build a DIY Geodesics Branes, so I’m very interested how to generate noise.
First. I’m not an expert. I’m just willing to learn things. I do some calculations of the Q Point of Q2 and tried to calculate the noisy ac output voltage, but I’m not sure if this is right, cause I never worked with noise before in such a way.
Then I build a test circuit with some BC547B (I don’t have some MMBT3904 here), but the test was a big fail. I did not understand why I could measure a V_BEO Voltage of 10 Volts or more. Shouldn’t the transistor Q1 work in breakdown? (for the BC547B V_BEO = 6V, too I think). And my DC voltage at V_out was almost Vcc (12V).
I didn’t understand anything. Is this only because the choice of another transistor? (I thought they have similar characteristics) Is my calculation false? I don’t get it.
I already asked some of my fellow students to help and get some interessant answers: They mean I should use a Emittier Resistor with a bypass cap to stabilise the Q Point, but in the Kinks module its working without one…
So I would be very helpful for any kind of help
THX and double THX
EDIT: I forgot to check my assumption that Q2 is working in saturation mode:
V_CE2 > V_CE,SAT = 0,2V
1,4V > 0,2V so the assumption was correct