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Forum Home > Tips, Tricks and Tutorials! - Builder's Guides for GuitarPCB Boards! > Sticky: Audio Path Debug Toolbox

Barry
Site Owner
Posts: 8781

This is the place for placing Audio Paths for circuit debugging.

More info on using an Audio Probe for debugging.

Another helpful link on Tracing an Audio Path.


This should not be a place for discussion (Documents Only!)

Right Click and Save As (PC) to download the Document for a larger view.

Thanks to Petevig, Billy, Wilkie, Tonmann and others for their help in putting these together.








March 30, 2014 at 2:42 PM Flag Quote & Reply

Barry
Site Owner
Posts: 8781

357 Magnum aka; XX Double Shot





Angry Red Camel




Colortone OverDrive - C.T.O




ColorTone Supa Fuzz ToneBender



Dr. Rock




Emexar





D.S.O.T.M aka Luna Fuzz




D.V.F - Dual Voice Filter



D'Lay



 


Guitar Bass Driver






MKC1




Mini-Me





MoRC



EA TREMOLO



SWAW

Proper Q voltages for comparison (all pots full CCW)

Q1: (7.27 - 3.71 - 3.23 - DSG) <- Drain Source Gate not CBE

Q2: (5.05 - 3.75 - 2.90 - CBE)

Q3: (5.05 - 2.90 - 2.86 - CBE)

The audio trace will go from Input to Output and should follow a fairly straight path from IN to R1, C1, thru Q1, thru C3, R5, to IC1B-14, then 16-12-10-9 thru R10, IC1B-13, thru R8, P1, then R10, to IC1A-3, out 1-5-7-8, thru C6, thru R15.





Plexi Plus

Using a regulated supply source of 9.14v I got readings from this Demo Build.

Q1

G - 0

S - 0

D - 0


Q2

G - 0

S - 0

D - 5.0


Q3

G - 4.36

S - 4.59

D - 9.14


Q4

G - 0

S - 0

D - 4.59


Q5

G - 0

S - 0

D - 4.71



TONE TWEQ





The Vibe

Confirmed Voltages:

This is a readable list of voltages to compare with.

Power = 9.15


IC3

1-0.4 8-0.0

2-4.35 7-8.87

3-3.60 6-1.35

4-0.0 5-0.15


IC2

1-4.45 14-6.82

2-6.08 13-4.58

3-5.81 12-5.19

4-9.15 11-0.0

5-3.94 10-3.98

6-3.94 9-3.94

7-3.94 8-3.46


IC1

1-0.14 8-0.0

2-3.94 7-9.15

3-3.76 6-3.94

4-0.0 5-0.14


Q5

C-1.94

B-3.39

E-3.94


Q1

G-3.94

S-3.94

D-1.65


Q4

G-5.82

S-3.94

D-1.65


Q2

G-3.94

S-3.94

D-1.65


Q3

G-5.19

S-3.94

D-1.65



Zenith Mini




March 31, 2014 at 8:28 AM Flag Quote & Reply

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