SOLVED Octarock smoking

[Ctrl4Smilerz]

So just did first power up for an Octarock build and I got nasty smelling smoke coming out. Took a look and the middle IC was in backwards. I fixed it, but also noticed that the 10R resister on the top right of the board was burnt out (likely what was smoking). I only have one more 10R resister on hand so before I plug it in again, I want to make sure I got it right. Does it make sense that the IC being backwards would have fried the 10R?

 

[owlexifry]

did you inhale?

 

[Robert]

The top right resistor (R101) is in series with the power supply for the middle IC (IC5) so that's likely.

 

[Ctrl4Smilerz]

did you inhale?

Only weed

 

[music6000]

Only weed

Try celebrating after it fires up, not while building it!

 

[Ctrl4Smilerz]

Well no more smoke, but I'm generating a tone, where the frequency changes when I play with any of the pots. FYI I did sub JRC4580Ds for JRC4558Ds.

 

[music6000]

Some plastic welding maybe required!

 

[Mentaltossflycoon]

Only weed

 

[Robert]

Did you replace the CD4013, or just turn it around?

If it pulled enough current to toast that resistor it might be defective.

 

[Ctrl4Smilerz]

Did you replace the CD4013, or just turn it around?

If it pulled enough current to toast that resistor it might be defective.

No I didn't replace it. Sound like it may be fried, is there a way I can test with a DMM?

 

[Feral Feline]

I wouldn't bother testing it, you've already released its magic smoke.



You'll need a new one that still contains its magic smoke.


How they get the magic smoke in is a more closely guarded secret than how they get the caramel into a Caramilk bar !

 

[PJS]

While you are replacing things - C15 and C16 are melted enough to be very suspicious.

 

[Bio77]

Are the jack wires reversed? Hard to see. The sleeve should be going to ground.

 

[Feral Feline]

Looks like the jacks are wired correctly.

 

[Brett]

Looks like the jacks are wired correctly.

I think @Bio77 is correct, the input jack does look wired in reverse.

 

[Harry Klippton]

Kinda looks like the input jack is wrong and the output jack is right but it is hard to see

Edit @Brett beat me to it

 

[music6000]

My eyes are telling me both are wrong!

 

[owlexifry]

My eyes are telling me both are wrong!

agreed. they're both wrong/backwards

 

[giovanni]

Isn’t R101 usually in the kohm? 10R would be incorrect in that case?

Edit: never mind. It’s in series with the power. Should be fine.

 

[Feral Feline]

I think @Bio77 is correct, the input jack does look wired in reverse.

Yup, I believe you're correct that Bio77 is correct.

After I read his post I looked at the pic again and thought it was okay, but after your post I grabbed one of my own jacks...

I stand corrected, the input jack in fact is incorrect, and if I'm correct and not mistaken it's the same type of jack for the ouput which would mean that its wiring, too, is incorrect.

Further corrections must be made! Correct?