FSH No effect, just a low pass filter type of effect

[Jmkrull]

So, I just finished my build and it works great when no engaged, very quiet and when it is engaged, none of the modes work (filter and sample/hold), nor do the knobs make any discernable difference. It just acts like a low pass filter. Where would I start to get this effect working properly? Thank you.

Using: http://www.tonepad.com/getFile.asp?id=138

Offboard #5: http://www.tonepad.com/getFile.asp?id=76

LED suggestions from Chromesphere as well as IC tips: http://www.youtube.com/watch?v=5x_2F6iOYkg

*I have my LEDs connected to the 7th pin of the ICs and the + connected to top center on the switch. They do not pulse LFO or do the up/down swell or decay. Is this the source of the problem?*

Q1: 2N5088
Q2: J201
Q3: 2N3906
Q5: J201
Q6: J201

Everything else is standard and wired in the appropriate place with painstaking care to make sure no traces are connected where they shouldn't be.

[hannibal827]

Please post your voltage readings

http://www.diystompboxes.com/smfforum/index.php?topic=29816.0

[Jmkrull]

Please post your voltage readings

http://www.diystompboxes.com/smfforum/index.php?topic=29816.0

No problem, I will get this up hopefully tonight or tomorrow.

[Jmkrull]

I have my LEDs connected to the 7th pin of the ICs and the - connected to top center on the switch. They do not pulse LFO or do the up/down swell or decay. Is this the source of the problem? Where should I connect the negative end?

[Jmkrull]

I switched the grounds from the 3PDT to the jack and now I get no sound, but the LEDs function as they should (pulse or up/down swell). I get no sound in engage in both F and SH modes.

Readings:

Q1 2N5088: C=11.62 B = 11.06 E= 3.48

Q2 J201 = G = .2  C= 11.06  Left = .01

Q3 2N3906 = E= 8  B=0  c= .56

Q5 J201 = G = 5.49 c=0  L=.1

Q6 J201 = G=.1  C=.67  L= 11.89

D1 = Line(cathode?) = 1  X= 584
D2 = Line = 214  X= 003
D3 = Line = 1  X= 209

Please help, this is bumming me out. I have been neglecting this soon to be awesome build because of this. Thank you in advance.

[Pyr0]

Looks like you might have Q1 and Q3 in upside down, or did you just get the pinout wrong when checking voltages ?

[Jmkrull]

Ohh, ok. I will give them a flip and see what happens. I know the build report mentioned something about some transistors being backwards, but i thought that was taken care of in the revised layout.

[Jmkrull]

I've finally found the time to do this and here's what I got. Nothing...

Flipped them and here are my readings.

Q1:

E = 12.2
B = 11.62
C = 11.35

Q3:

E = 8.85
B = 0
C = .53

Any other suggestions? Any help is Greatly appreciated

[Pyr0]

Well the collector of Q1 is wired direct to -9v, so I would start checking around the area of the MAX1044 IC.
Are you getting +9v, -9v, +8v & -8v on those 4  220uF capacitors  with respect to ground ?
Have you got the MAX1044 in the right way ?
Have you put the link in for the ground - it's the vertical black line under IC1 on the tonepad layout - between the 3K3 and 2M7 resistors ?

None of your voltages makes sense - there should not be anything higher than 9v, this effect uses a split power supply, +9v and -9v so I would expect some negative readings too