Angry charles not working
- Thread starter eeejar
- Start date
jimilee
Well-known member
neiltheseal
Well-known member
With a multimeter, select the mode to measure voltage. Clip the black lead onto ground and touch the red lead onto the pins of the op amp.
Ok not sure if im measuring it right but, if i pin the ground to the ground of the lm833 .
Pin 1 keeps jumping around but barely no v
Pin 2 same as number 1
Pin 3 0v
Pin4 0,103v
Pin5 0,102v
Pin6 same as 1
Pin7 sames as 1
If i put ground to the ground of a jack
All the other pins show 0v except pin 3 0.094v and pin 8 0.102
Pin 1 keeps jumping around but barely no v
Pin 2 same as number 1
Pin 3 0v
Pin4 0,103v
Pin5 0,102v
Pin6 same as 1
Pin7 sames as 1
If i put ground to the ground of a jack
All the other pins show 0v except pin 3 0.094v and pin 8 0.102
Last edited:
andrewsrea
Well-known member
From the picture, it appears your DC socket could be wired wrong. Center negative, sleeve positive. From the pic it appears the red is going to the center pin.
OK. I'll try to give summary of what i've tried so it would be easier for you to understand what i have tried and how to help me.
I checked all the component values. Everything seems to be correct.
I checked the orientation of the caps. And they are correct.
I looked at all of the solders and all of them seem to be ok, even if not all of them that pritty.
The led turns on when pedal is engaged.
When audio probing i get signal until the LM833. I do get a signal from lug 3, and lug 1 gives the faintest little signal that sounds really distorted and awful. After that completely silent.
And the readings i got from the LM833 you can see from earlier comment on this thread.
I hope this helps you help me!
I checked all the component values. Everything seems to be correct.
I checked the orientation of the caps. And they are correct.
I looked at all of the solders and all of them seem to be ok, even if not all of them that pritty.
The led turns on when pedal is engaged.
When audio probing i get signal until the LM833. I do get a signal from lug 3, and lug 1 gives the faintest little signal that sounds really distorted and awful. After that completely silent.
And the readings i got from the LM833 you can see from earlier comment on this thread.
I hope this helps you help me!
z2amiller
Active member
That's the right way to measure. It does look like your chip is not getting power, and as a matter of fact
nothing may be getting power. +1 to checking the jack wiring and/or the reverse polarity protection diode.
(D1)
Eyeballing the circuit, you should be getting
pin1-3: ~4.5V +/- 1v fluctuation
pin4: 0V
pin5-7: ~4.5 +/- 1v fluctuation
pin8: ~9V
What are the voltages on either side of R8/R9? That is the voltage divider that should be giving you the ~4.5V
that should be showing up on your op-amp(s).
I would expect R8 to show 9V / 4.5V and R9 to show 4.5V / 0V.
I'd measure all the way along your power path:
- At the jack itself
- Either side of D1 (~9V on the left, slightly less on the right)
- C8 (~9V on +, 0V on -)
nothing may be getting power. +1 to checking the jack wiring and/or the reverse polarity protection diode.
(D1)
Eyeballing the circuit, you should be getting
pin1-3: ~4.5V +/- 1v fluctuation
pin4: 0V
pin5-7: ~4.5 +/- 1v fluctuation
pin8: ~9V
What are the voltages on either side of R8/R9? That is the voltage divider that should be giving you the ~4.5V
that should be showing up on your op-amp(s).
I would expect R8 to show 9V / 4.5V and R9 to show 4.5V / 0V.
I'd measure all the way along your power path:
- At the jack itself
- Either side of D1 (~9V on the left, slightly less on the right)
- C8 (~9V on +, 0V on -)
