i dont know why could be a problem, go for it

v2 fixed bias controversy

recorded in line with zoomh4n pro , same level in for both

yes , that was discussed, on other hand , i got the unit running just fine, i will post a video about it, i could bodge the connection as you sugested for test, but all 3 bands are working as it should , i got i nice ammount of signal too, no distortion ,could you reason why vcc2 must be connected t...

also, whats going on with this varicap on input? d17 and d18, https://pt.wikipedia.org/wiki/Varicap

thats new to me , its some form of Witchery ? :0) , ok going back to work

yep make sense george, i was sratching my head on this input topology, not making any sense , i was thinking about some sort of common base circuit, , silly me ,great link george , i will redraw and resume the work , thanks again

ok , im triyng to trace the thing , i found the smd named GY 8 transistor (?) and cant find the reference in smd books, anyone know this piece?

tested with ad chip, ended up using the tl062 :0), verified

yes,working and sounds good

yep, thanks mate, im drawing the off board connections to post here, i little puzzled by the 2 gray wires , triyng to sketch the rat nest , i order a pcb for test , lets see if works as it should ,

edited, there are 2 gray cable , one is near the mid center tap pot and another is on r14

i trace the pcb and came whit this, to be verified, not sure about the bias ( ref bias) on second opamp (treble), also c1 should be 47n not 4n7

the caps between the pots apears to be missing, c9 and c6 , on bass and mid section( ps dont mind the actual number on component , i will fix later) :0)

thanks mate, yes the caps on the pots are 47n both, i think r6 and r7 are 100k maybe, good work anyway mate, im triyng to work in the topology of eq but whit no trace visible on the back of the board its hard :0)