NPN Dallas Rangemaster Clone - Very High Pitch Noise Issues

[IbanezRG95]

I recently built a dallas rangemaster and a valvecaster both in the same enclosure for a friend. no problems with any 'abnormal' noise. (I wired them up so they could be switched on and off independently, there was no noise issues with just the rangemaster engaged).

However, I just finished building two rangemaster clones in their own enclosures, and I have a problem. There is a quite noticeable noise of approximately 15 kHz when the pedal is engaged. The noise is the same pitch and amplitude when the boost pot is on full or nothing. I tried placing a 47uF electrolytic across the power supply, but there was no perceivable change in the noise. I am running the pedal off a boss power adaptor, and the first rangemaster i built didnt have any problems. 

Any ideas? I built the NPN version from fuzz central
http://fuzzcentral.ssguitar.com/rangemaster/rangeblasterschematic.gif

Thanks

[Pyr0]

If you run it from a battery do you get the same noise ?
If not then the noise might be getting in from the PS, you could try adding a small cap in parallel with the 47uF across the supply rail to ground, say something like 0.01uF, also try increasing the 47uF cap to 100uF.

[Gus]

Try a 9 VDC battery this is easy and will help figure out what is going on as Pyr0 posted.

Look at what is different.  A Rangemaster type circuit is going to be under 1ma current draw(no LED).  Use ohms law, for that circuit the DCV across the 68K divided by 68K gives the current in the bias resistors then add that to the VDC across the 3.9k divided by 3.9K this is the current in the emitter leg of the transistor.

The valvecaster has heaters so it uses more current.

[IbanezRG95]

I worked out that the problem is the LED current limiting resistors. I had been using a bunch of 2.2k resistors in parallel. As I cut a resistor out of the parallel group, the high pitch noise got less noticeable. I will keep on upping the resistance until the noise is gone. Thank you for your responses.

[Pyr0]

Use one of the super bright leds, they require a lot less current and you should be able to up the current limiting resistor to around 5k and it will still be plenty bright.

[Gus]

Did you try disconnecting the LED part of the circuit?
What type of LED did you use?  http://en.wikipedia.org/wiki/Light-emitting_diode
Did you try a 9VDC battery?
What is a bunch of 2.2K resistors in parallel two(1.1k) ten (220) etc.?
What is the power supply rated at for current? it should be marked on the supply.

Did you measure voltages in the treble boost circuit?  
http://www.diystompboxes.com/smfforum/index.php?topic=29816.0