Recent content by andrewsrea

Great concept for the thread. Sometimes an artist's gear list is available, but it is the stuff they are endorsed for and not what they used on the recording. Often the recorded gear was the studio's or producer's. Then there is microphones and post processing. Having played in moderately...

Lots of good ideas prior to my post, but I am going to share left field similar things which happened to one of my moderate gain drive designs, which uses a charge pump and was on a board with other pedals which did not have a charge pump and did not exhibit the noise: faulty GFI outlets. A...

I've burned out circuit traces on a few of these PCBs when removing parts. I've successfully found them and jumpered them with small bits of wire. A few times I thought about just starting over. The good news is that these PCB projects are built to stay together. The bad news, that makes them...

IC2 Pin 4 should be -9Vish. IC100 pin 5 should be negative read to ground (-9V). Defective charge pump?

That chip is great for anything you want uncolored / low distortion.

Cool. I'd still recommend testing the ohms readings between pin 2 and 1, then 3 and 1. The reason I say that is, with the volume pot being the very last component before the output jack, it should mute any noise or signal when turned completely off. Sounds like you got solid advice on the...

Did you try and put a signal (guitar) through the effect? If yes and you heard guitar sound, does the volume affect the loudness of the guitar? My logic: This circuit emulates a combination of a Rangemaster treble boost into a Laney Supergroup amp, to which the real deal is hissy and fizzy. I...

@Feral Feline - I agree for that application.

I repurposed the stock SPDT of a Vox wah which has a very long thread neck to reach the treadle that no 3PDT that I could source could be found. The stock SPDT becomes in essence a SPST for grounding the relay coil and the LED indicator at teh same time. The common lug is sent to ground and the...

Exactly!

Yes, except my design can use the existing SPDT stomp switch, alleviating trying to find a 3PDT (my design can simultaneously actuate an LED indicator) with the right height throat to actuate the effect or true bypass. Plus, 3DPT typically require more downforce to actuate and are mechanically...

Reading back on your original post, I wasn't clear on exactly what it is or is not doing. Is it lights and no sound when the effect is engaged? 18v into that charge pump circuit would have created a burst of 32+ volts (it may have surged even higher). A TL072 is rated at 40V but can be...

It could be that the charge pump is defective, perhaps with an internal short. +9VDC supply should render around +8.5VDC after the 1N5817 & 100ohm resistor. The voltages indicate no voltage doubling and more current than designed, going across the diode and resistor, causing additional voltage...

Putting +18VDC would at first, fry the TC1044S. Next, C101, C102, C103, C24, D101, D102 and all transistor / FET components would have to be checked. The charge pump may have generated 31VDC for a few hundred milliseconds, which could wipe out 25V caps, The transistors and FETS might have...

The more gain stages, the more the self-noise of the ICs gets amplified. Many designs combat that with 47pF to 470pF negative feedback capacitors in the gain circuit.