Neovibe debug

[Mich P]

Hi all
just finish the neovibe
but i have a problem
when i connect the unit
the bulb blinking for few seconds
and stay on and doesn't blink !!
Any idea ?
Thanks
Mich P.

[R.G.]

If it blinks for a few cycles and then goes out, it's likely low gain in the LFO transistors or miswiring.

But go read "Debugging: What to do when it doesn't work".

[Mich P]

here transistors voltage
Q1 e 1,0       Q2 e 1,53   Q3 e 3,72
     b 0,86          b 2,09        b 2,09
     c 2,1            c 4,31        c 11,09

Q4 e 4,32     Q5  e 3,76     Q6 e 4,35
     b 4,24           b 4,32          b 4,27
     c 15,04          c 11,23        c 15,04

Q7 e 3,78      Q8 e 4,35     Q9 e 3,79
     b 4,35           b 4,26          b 4,35
     c 11,21         c 15,04         c 11,20

Q10 e 5,53     Q11 e 12,97    Q12 e 12,4
       b 5,42            b 4,21            b 12,9
       c 15,04           c 23,10          c 23,10

Q12 e 3,3      DB 102 in 24,4      78L15  in 23
       b 3,9                 out 23                 out 15
       c 19,6
     

[Mich P]

Transistors are 2n5089 and 2n 3904 for Q13
Mich P.

[plankspank]

Double check the speed & depth pot wiring; also make sure the caps are oriented correctly...

[Mich P]

Yeah that"s it
well done plankspank & RG !!
bad solder on the speed pot !!
Hell, devil is always in details ...
Thanks both of you
Mich P.

[JOHNO]

Id also be checking some of those transistors as Q4,6,8,10 dont have a diode drop between base and emitter. And also Q12 i dont think is right. Although you have Q12 writen twice i think its a typo. good luck, JOHNO