Naughty Fish loud high pitched or whistling sound

[pahurst2002]

Hello:
This is driving me nuts, cause the pedal sounds great and functions properly, but there is a loud high pitched or whistling sound when the on/on/on switch is in the center position.  When switched to either side position, the sounds is still there, but to a way  lesser degree. I can still hear it, but those modes are almost usable.  I used the Xvive and not the macrons as suggested.  I used the exact dpdt switches from small bear suggested in the build document.  My build seems pretty clean and I don't believe there are any bridges in the solder causing issues.  I'm wondering if I have a bad TL072, but they're new and probably fine.  Anyone out there familiar with this problem?

[midwayfair]

What charge pump did you use? The exact part number on the chip.)

[pahurst2002]

I didn't think to mention before that I had it being powered by a 9v battery, cause I just sold my power supply.  I noticed that it's not run on a battery in the build plans.  Kind of doubt that's it though.

From the specs read out below of my charge pump, it would seem you may be right?  I would think it needs to have a max input of 9v or higher, and put out what for voltage?

Charge Pump:
In smaller characters at the top, LT1503 with a 03 running perpendicular at the the end of the 1503.
Then, in the middle, LT 1504.
And, at the bottom, CN8.

http://www.ebay.com/itm/401303887652?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

LT1054 DIP-8 Switched-Capacitor Voltage Converter With Regulator
DC / DC Converter IC Case: DIP
Input Voltage Max: 7V
Input Voltage Min: 3.5V
No. of Outputs: 1
No. of Pins: 8
Operating Temperature Max: 100°C
Operating Temperature Min: 0°C
Output Current: 125mA
Output Voltage: -5V

[fredwreck]

Lets see a list of your voltage points so we can better help you.

[pahurst2002]

It wasn't the battery power.  I got a new power supply and hooked it up right, but the same whistling is still there.  I swapped out all of the TL072 chips and that did nothing also. I'm stumped. I have a 2nd LT1054 charge pump IC I can try, but it's the exact same chip from the same supplier.  Doubt thats the problem, and I think I have the right charge pumps.  I'm wondering if any other charge pump could work in it's place.  I used all the DPDT switches suggested in the plans, but I'm also wondering if the 3 way one is the reverse laid out style.

Also, I think the output or input wire slipped out of my testing rig while messing around and the whistling was still there. 

[pahurst2002]

Ohh, sorry, I didn't see that someone had replied about the voltage points.  I've never done that before but I'll try and get those on here asap.

Thanks!

[pahurst2002]

Here's my voltage readings along with correct numbers from the build plans. Correct voltages followed by mine.

IC1:
1.   3mV     .2mV
2.   3mV     .2mV
3.  .8mV     .2mV
4. -8.59V      -7.89V
5. 2.9mV    .2mV
6  1.80mV    -1.2mV
7  2.3mV    -1.1mV
8  9.16V      8.76V

IC2(L): I figured L and R meant the trimpot turned all the way to the left and right.  Both sets of readings were almost the same for me, so I only bothered listing my right.
1.   .56V        .47V
2.   1.2mV    1.7mV
3.   1.1mV      .3mV
4.  -8.6V      -7.9V
5.    .7V          .46V
6.    .73V        .46V
7.   2.5V        2.18V
8.   9.15        8.7V

IC3:
1.   0               -1.4V
2.   2.2mV       -1.1mV
3.   .8mV         .3mV
4.   -8.61V       -7.9V
5.   .7mV         .2mV
6.   .5mV         -1.4mV
7.   .3mV         -1.2mV
8.   9.16V         8.76mV

IC4:
1.   1.5V         -.2mV
2.   4.98V       4.62V
3.   .9mV        .3mV
4.   -3.9V        -3.7V
5.   -8.6V        -7.89V
6.   2.55V       6.36V
7.   1.41V       6.03V
8.   9.15V       8.74V

[oldsoul]

Ever trace down the whistling noise


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