Ocanaut Not Working

[TCHarley]

Hi guys,

I was hoping I could get some help troubleshooting my ocatnaut build. It is really fuzzy and the volume jumps around like crazy. I am not really sure where to begin. Any ideas? Here is a quick recording, first with the pedal off, then on with both pots open all the way.

octanaut test.mp3

drive.google.com

My apologies. I know this isn't much to go on.

 

[TCHarley]

BS170 are prone to Static electricity, were they sent in a static free Silver Satchel.
Chime in Fellow Members!

I am pretty sure they were

 

[Nostradoomus]

Yes Digi-Key is very good about that. Almost annoyingly so.

 

[music6000]

Confirm that the 4 resistors R2, R10, R13, R19 are 5K1 - Green, Brown , Red, Gold

 

[Nostradoomus]

They look like it from the picture.

 

[TCHarley]

Confirm that the 4 resistors R2, R10, R13, R19 are 5K1 - Green, Brown , Red, Gold

Confirmed, they are 5k1

 

[music6000]

We are at a stale mate, the Trimmers are not bringing the voltage down on the BS170's to 4..5v
It does not make sense that all 6 transistors would be damaged

 

[music6000]

This is where we need to take a LOOK at the back of the Board.
We need a Picture please.

 

[TCHarley]

This is where we need to take a LOOK at the back of the Board.
We need a Picture please.

Will do!

 

[TCHarley]

Sorry for the long delay. Here is a picture of the other side of the board. You can see where I desoldered that cap I had in backwards some of the top layer came off unfortunately

 

[TCHarley]

This is where we need to take a LOOK at the back of the Board.
We need a Picture please.

Just replying to your comment in case you didn't see my last post. Thanks

 

[music6000]

You need to do a Continuity test with your DMM to see if you haven't damage that trace when turning the Electrolytic Around.
Check for continuity from Green dot C100 + Pad to green dot 1N5817 pad. No Beep , Damaged!
Check Blue dot C100 - pad to Ground. No Beep, Damaged!
Confirm that you did put a new 47uF in.
1.00am Here as i write, Good Luck & Goodnight.

 

[music6000]

Sorry for the long delay. Here is a picture of the other side of the board. You can see where I desoldered that cap I had in backwards some of the top layer came off unfortunately

All is not lost if there is damage, it can be fixed with a Link or jumper
The Pink Dots are for the C100 Ground Link.
The Light Blue is for C100 + Links, Check Light Blue dots for continuity.
You should try spraying the PCB with some Electronic Cleaner Spray, there is a lot of residue.

 

[TCHarley]

All is not lost if there is damage, it can be fixed with a Link or jumper
The Pink Dots are for the C100 Ground Link.
The Light Blue is for C100 + Links, Check Light Blue dots for continuity.
You should try spraying the PCB with some Electronic Cleaner Spray, there is a lot of residue.

View attachment 3160

Thanks for this, i will poke around in it tonight. I didn't get a chance this weekend to check based on your last reply

 

[TCHarley]

All is not lost if there is damage, it can be fixed with a Link or jumper
The Pink Dots are for the C100 Ground Link.
The Light Blue is for C100 + Links, Check Light Blue dots for continuity.
You should try spraying the PCB with some Electronic Cleaner Spray, there is a lot of residue.

View attachment 3160

Continuity checks are all good here.

 

[music6000]

Continuity checks are all good here.

Great, Now spray the back of the board with a good quality Electronic's Cleaner Spray, use a toothbrush & it should all come up like new.
Then you can see if you have any dry joints.

 

[Phil hodson]

Did this ever get solved? I have been playing with my Octanaut today and all 4 of my BS170 won’t go below around 6.7v
Any thoughts?

 

[music6000]

Did this ever get solved? I have been playing with my Octanaut today and all 4 of my BS170 won’t go below around 6.7v
Any thoughts?

Are your 5K1 resistors 5K1. There is no set voltage, tune by ear
This is how the Original is used:

https://images.thomann.de/pics/atg/atgdata/document/manual/241369_jonny_octave.pdf

 

[Phil hodson]

Are your 5K1 resistors 5K1. There is no set voltage, tune by ear
This is how the Original is used:

https://images.thomann.de/pics/atg/atgdata/document/manual/241369_jonny_octave.pdf

Will go and double check!!

 

[Phil hodson]

Are your 5K1 resistors 5K1. There is no set voltage, tune by ear
This is how the Original is used:

https://images.thomann.de/pics/atg/atgdata/document/manual/241369_jonny_octave.pdf

Yep they are 5.1k resistors. Still sounds more like a distortion even with the trim pots wound all the way down. Will have to take it out of the box and do some investigating I guess.