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Fuzz trouble

Started by speakz, July 28, 2014, 09:50:24 PM

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speakz

Greetings,

I have soldered together a GGG FF5 with germanium Transistors from Small bear.  I used Small bears resistors which came with the GTs except I substituted one where the GGG instructions gave a different value of 1k instead of 11 when using the R5T trimmer which I did use.  I attempted to follow the layout and wiring diagram for the 2 knob Germanium FF5 directions.

When I plug in and turn it on I am getting some motor boating and low LED light... then when I turn up the volume pot the motor boating goes away and it works somewhat as well the LED also increases in brightness (this is with 9v battery). 

Any help would be greatly appreciated.  This is my first DIY stomp box project. 

Thanks



Digital Larry

Wait you used 11 ohms instead of 1k?

I'm looking at this layout:

http://www.generalguitargadgets.com/pdf/ggg_ff5_lo_pnp.pdf

I don't know if that's the one you used.

Unfortunately I don't understand layout drawings these nearly as well as schematics.  If I were you I'd find a 1k and put it where it says 1k.  When you turn down your trimpot you are pulling way too much current.
Digital Larry
Want to quickly design your own effects patches for the Spin FV-1 DSP chip?
https://github.com/HolyCityAudio/SpinCAD-Designer

speakz

I did use the 1k specified for the trimmer spot.

I appreciate you taking a look though.  Any other ideas?

Also is there a reading I should test for on the board that would be helpful?  I have tested resistance before but am not sure how to use the multimeter to test for these voltage numbers on the different pins.

LucifersTrip

#3
here're  good working voltages..they may vary a bit, of course.

q1e: 0
q1b: 0.1    
q1c: 0.578  

q2e: 0.447
q2b: 0.578  
q2c: 4.51

and

always think outside the box