SOLVED Mach 1 problem

[RicsPedalboard]

Hi!! Hope someone can help me. This is my first build... I have check everything to find a short or something else but I cant find the problem. When I plug the 9vdc to it the voltage drop to around 3vdc and the diode D100 come really hot.

 

[Kyle004]

TUTORIAL - Troubleshooting 101

There comes a time for every builder to spend multiple hours soldering, wiring, and breadboarding a certain circuit just to have it work incorrectly, if at all. This could happen on your first build or any build after that. This write up is to help you in your quest to figure out why it isn't...

forum.pedalpcb.com

I figured id link this im new as well but someone linked this on my troubleshooting post and it helped me understand alot. Hope it helps

 

[carlinb17]

Your IC appears to be upside down

 

[RicsPedalboard]

Your IC appears to be upside down

Thanks! I didnt know the IC have a polarity... Will try it on the other side

 

[carlinb17]

The circle indicates pin one on an ic. I believe all of @PedalPCB circuits are orientated the same. Some ic are marked with a notch as well.

You might have damaged the ic when it was upside down. something to consider if it’s not working still.

 

[blackhatboojum]

Your dc wiring looks like it might be backwards as well. You have your red wire to the pin of the dc jack and your black wire is to the sleeve. How are the wires from your dc jack attached to the circuit board?

 

[RicsPedalboard]

Your dc wiring looks like it might be backwards as well. You have your red wire to the pin of the dc jack and your black wire is to the sleeve. How are the wires from your dc jack attached to the circuit board?

The red wire is on the center pin and connected to the negative on the board

 

[PJS]

The usual convention is that a red wire carries positive power supply and black carries ground for DC circuits. That is such a universal standard that you are going to confuse yourself and others if you don't follow it. May not be worth changing for this one, but do it in future.

Photos of the solder side may help with tracking down shorts

If you are removing the IC, I would replace it with an IC socket. Socketing ICs makes it much easier to replace them if you end up with a problem (or just to experiment with different types of OP amp to see if they sound any different )

Do you have a pot cover on the hidden pot, as well as the ones we can see?

 

[blackhatboojum]

The red wire is on the center pin and connected to the negative on the board

Ok. I assumed as much but, wanted to make sure. As PJS said, conventional wisdom is red positive, black negative. I also agree with PJS about using sockets for ICs. My first build turned into a disaster because I didn’t use a socket. Anyway…. Welcome to the forum and the addiction of building your own effects.

 

[RicsPedalboard]

Thank you all!! It's working with the IC on the good side haha! Will install IC Socket for future build and use the color code for the wires.

 

[Chuck D. Bones]

I'm surprised the IC survived such abuse. If it's still working tomorrow, mark it SOLVED.

 

[Grubb]

Also, great choice of pedal. This is my favourite project I've built so far.