These are "gyrator-circuits' (I too was confused about these..).RnFR wrote:can someone tell me what's going on with Q5, Q7, and Q8?
They emulate an inductor.
Do a google search for gyrator, you get a far more explanation than I can give you
K_m
These are "gyrator-circuits' (I too was confused about these..).RnFR wrote:can someone tell me what's going on with Q5, Q7, and Q8?
They look strange, don't they? They are "gyrators" - they are a method of emulating an inductor. The inductor values you need to be useful at audio frequencies make for quite big, heavy, expensive components (take a look at the size of a 500 mH coil used in a Wah, and you'll see what I mean). Those little transistor circuits are actually the equivalent of a coil in series with a capacitor, so they are resonant at carefully chosen frequencies.RnFR wrote:can someone tell me what's going on with Q5, Q7, and Q8?
the input buffer for example, to me the layout is not the same as what the schematic tellsthesmokingman wrote:which parts of the schematic are you questioning the validity of?