May I get a little help please

[whomeno]

yes fixed the 3.3 k resistor and turned the C28 around like antonis said to do. It is late here so will do all the steps tomorrow. I will let you know how I make out
Thanks

[Rob Strand]

yes fixed the 3.3 k resistor and turned the C28 around like antonis said to do. It is late here so will do all the steps tomorrow. I will let you know how I make out
Thanks

I noticed C28 yesterday.

I actually thought C28 on the PCB was OK as it originally was.   The schematic does have C28 drawn wrong.

So maybe you need to flip C28 back.

I'll check again.

[whomeno]

I did not add the second 1k yet. I now have good tone all the way through. But when the tone is off and pedal still on, there is a lot of bad bad static noise

[Rob Strand]

I checked C28 on the PCB.  The original layout looked OK.  The negative of C28 should go to pin 5.

C28 on the schematic is flipped.
(Also the schematic shows 2x220uF and the PCB/layout has 2x100uF. That's not your problem though. )

I did not add the second 1k yet. I now have good tone all the way through. But when the tone is off and pedal still on, there is a lot of bad bad static noise

it's not 100% clear what the cause is at this point.

[whomeno]

ok  probing now. since i added the 1 k resistor and the 100pf to vol. i do not have any gain it is just on no increase as you turn it up

[Rob Strand]

ok  probing now. since i added the 1 k resistor and the 100pf to vol. i do not have any gain it is just on no increase as you turn it up
Modify message

Maybe check your wiring or for shorts to ground on the 100pF caps.  All the mods I've mentioned today should be very benign in terms of affecting the guitar signal.  They should only affect the oscillation and stuff you can't hear.

Sometimes other things short out when you move the board around while soldering new parts.

Trace the signal at  the output of each opamp from left to right on the schematic and see if you can find where the signal stops.

[whomeno]

I have signal the whole way through. just the gain pot is not working. when you turn the pot up the volume should go up with it . it dose not.

[whomeno]

ok
here is what i know. 1 the gain pot is on or off like a switch. you can not turn it to here the volume go up. I checked pot with meter and it is working, so i don't think it is the pot.
2 when the effect is on and no signal going to it it is extremely noisy.
3. when there is signal going through effect there is no noise at all

[Rob Strand]

(wait a sec just reading your last post.)

If you are getting a strong signal all the way through maybe there is an *open* circuit on one of the wires on gain pot.    That would produce a very a high gain.   No doubt make oscillation issues much worse than they would normally be.

If you are getting a weak signal maybe check for shorts on the gain pot or on the LEDs.  However this would normally kill the signal altogether.

here is what i know. 1 the gain pot is on or off like a switch. you can not turn it to here the volume go up. I checked pot with meter and it is working, so i don't think it is the pot.
2 when the effect is on and no signal going to it it is extremely noisy.
3. when there is signal going through effect there is no noise at all

if you listen to the output of the second stage opamp (the one with the gain pot)  Does the output there go on and off like a switch?

[whomeno]

yes probing on pin 1 of the 74 - if pot is counter clock wise whole way no signal. when you turn it up clock wise you get signal, but it is the same volume of signal form 1 way to the othere

[whomeno]

I have a strong signal clean through

[Rob Strand]

I have a strong signal clean through

Is you Gain pot a Log taper or Linear taper?
A linear taper might make the gain act on/off.

Other than that I'm looking at how a short can develop which would short across R5 or R6, or actually
any of the parts or tracks between the output of the first opamp and the -input of the second opamp.
R5 or R6 being a wrong and low value would also do it.

The thing is I'm not seeing any easy ways that would occur.   You part values look good also.

[whomeno]

Gain is a 1M log

[whomeno]

an updated photo

[whomeno]

looked over it cleaned it and still the same

[whomeno]

i'm going to head to bed. if you can think of any thing else let me know. i will give any thing a try right now. I just got done doing tight metal  and a throttle box. had no trouble at all
thanks for all your help on this one.

[Rob Strand]

i'm going to head to bed. if you can think of any thing else let me know. i will give any thing a try right now. I just got done doing tight metal  and a throttle box. had no trouble at all
thanks for all your help on this one.

No worries.  Sometimes little bugs creep in and cause headaches.

I'll have to ponder over what the problem is.    The pot has the right taper so it's not that.

Maybe someone else can see something.

[whomeno]

All done. replaced C5 22n and R5 47k. every thing works as it should.
Thanks for all the help

[Rob Strand]

All done. replaced C5 22n and R5 47k. every thing works as it should.
Thanks for all the help

Good news.  You did well swapping those parts.

The problem seemed to be in that area but the parts looked OK.  I'm not sure exactly what was wrong.