Green Russian big muff clone not quite working

[snow123]

P.S.
Sorry @snow123 but I think you've managed to turn the most well-intenioned guys (like Kevin & Tom) into ironic/sarcastic blackguards..

.... and some of us are naturally blackguardings.





with all your changes and still having faults, please retake and post all transistor voltages again.

THATS WHY IM NOT HAVING AUDIO ON C5. i swear most of the issues with this are just caused by me being a blind idiot.

[snow123]

i have a very fuzzy collector on q2 and q3 now!!!!!

[snow123]

ok, now the pedal mostly works but when i plug everything in and stuff, and turn up the volume and the fuzz, the low end starts to get really boomy, really easily. so im assuming thats something to do with the tone stage?

[snow123]

P.S.
Sorry @snow123 but I think you've managed to turn the most well-intenioned guys (like Kevin & Tom) into ironic/sarcastic blackguards..

.... and some of us are naturally blackguardings.





with all your changes and still having faults, please retake and post all transistor voltages again.

that resistor says .97 on the DMM, and heres the voltages:

Q1:
E - .1
B - .7
C - 4.4

Q2:
E - .1
B - .7
C - 4.2

Q3:
E - .1
B - .7
C - 4.2

Q4:
E - .9
B - 1.4
C - 4.1

[snow123]

for some reason the 100k resistor thats going into q1s base is reading at 8.3k rather than 9.95k (with my DMM on 200k ohms.) but the 390r is normal.

[snow123]

for some reason the 100k resistor thats going into q1s base is reading at 8.3k rather than 9.95k (with my DMM on 200k ohms.) but the 390r is normal.

wait all of the 100k resistors are reading 8.3k, so im assuming thats normal?

[bluebunny]

No it's not.  But I'm guessing you're measuring the resistors while they're in-circuit.  In which case, they're in parallel with everything else (and therefore give a lower reading).

[snow123]

No it's not.  But I'm guessing you're measuring the resistors while they're in-circuit.  In which case, they're in parallel with everything else (and therefore give a lower reading).

Yes, I am measuring them while in the circuit.

[snow123]

And are those voltages normal? 'cause the GGG page has voltages just for the regular big muff pi but not for the green Russian muff, And the main reason I was testing the resistors and stuff is to see why the voltages on the emmiters on all of the transitory are 1 volt too high compared to the GGG page.

[bluebunny]

Yes, I am measuring them while in the circuit.

You need to lift one leg before you measure it (for the reason I gave).  The measurement is meaningless otherwise.

The voltages for one BMP vs. another BMP will be largely the same, since it's 97%¹ the same circuit each time.  Meter loading may account for some (non-catastrophic) differences.

___
¹ I made that number up, but you get the idea...

[snow123]

Yes, I am measuring them while in the circuit.

You need to lift one leg before you measure it (for the reason I gave).  The measurement is meaningless otherwise.

The voltages for one BMP vs. another BMP will be largely the same, since it's 97%¹ the same circuit each time.  Meter loading may account for some (non-catastrophic) differences.

___
¹ I made that number up, but you get the idea...

well since its parallel with everything else, 8.3k sounds about right tbh.

[snow123]

just lifted one leg and its 100k.

[snow123]

i dont really know why the emitters voltages are 1(ish) volt too high

[snow123]

wait the 470k near q1 is a little too high, its around 473k.

[antonis]

wait the 470k near q1 is a little too high, its around 473k.

Well within 1% item tolerance..

[snow123]

heres the voltages from q1-3


Q1:
E - .1
B - 3.8
C - 4.6

Q2:
E - .1
B - .7
C - 4.3

Q3:
E - .1
B - .7
C - 4.2

so q1s voltages are WAAAY OFF for some reason, while q2-3s collector and emitter are a little off.

[snow123]

i just swapped q1 with an mpsa18 and the voltages are just like everything else, so that seemed to be a bad transistor.

[snow123]

ITS WORKING NOW

[snow123]

time to move on to the phase 90?

[Phend]

DOD Chorus 565 maybe or DOD R825 Compressor ?
(Just kidding) Have fun on your next build what ever it may be.