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Bloodstone Phaser - Mad oscillation at output

Started by Vivek_rc, April 15, 2021, 12:19:40 PM

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Vivek_rc

Hi All,

I've built the bloodstone phaser from lectric-fx and it was working well as expected, had already been boxed and was still functioning even when boxed up. However after a hour of running it started to crackle and then just went into a mad oscillation. I audio probed it and find there is a high pitched whine sound from IC1 pin7 and along the path to the 3pdt color switch on A2/A1. I'm not sure where to start troubleshooting and have checked the voltages of the ICs and they all check out. I'm not sure about the voltages I should be expecting on the cd4009 and wondering if it is damaged. I've tried to reflow all the joints but still not getting anywhere. It's weird cause it was working perfectly well but suddenly just went crazy . Any help and guidance would be appreciated.

Vivek

Vivek_rc


Scruffie

Can you post your voltages?

The 4009 is static sensitive, possible it got a zap and then crapped out.
Works at Lectric-FX

Vivek_rc

Quote from: Scruffie on April 15, 2021, 12:24:09 PM
Can you post your voltages?

The 4009 is static sensitive, possible it got a zap and then crapped out.
Hi Scruffie,

Thank you for responding back, these are voltages I get, thanks again

Thewintersoldier

I just wanna say that I wish everyone posted their voltages so cleanly, bravo!
Who the hell is Bucky?

Vivek_rc

Quote from: Thewintersoldier on April 15, 2021, 02:38:40 PM
I just wanna say that I wish everyone posted their voltages so cleanly, bravo!
Haha, thanks Buddy.


Sent from my iPhone using Tapatalk

Scruffie

Here are approximate voltages from Haberdashers build;
IC1
1 4.5v
2 4.5v
3 4.5v
4 0
5 4.5v
6 4.5v
7 5v
8 8.5v

IC2
1 4.5v
2 4.5v
3 4.5v
4 0
5 4.5v
6 4.5v
7 5v
8 8.5v

IC3
1 4.5v
2 4.5v
3 4.5v
4 0
5 4.5v
6 4.5v
7 4.5v
8 8.5v

IC4
1 4.5v
2 4.5v
3 4.5v
4 0
5 4.5v
6 4.5v
7 4.5v
8 8.5v

IC5
1 6v
2 4.6v
3 6v
4 4.5v
5 6v
6 4.5v
7 6v
8 4.5v
9 6v
10 4.5v
11 6v
12 4.5v
13 0
14 6v
15 4.5v
16 6v

IC6 - This chip is LFO so voltages will be shifting around a lot, but you should be getting around 8.5v on pin 4 and pin 11 will be ground.
1 3.3v
2 4.4v
3 4.9v
4 8.5v
5 4.2v
6 4.2v
7 5v
8 4v
9 4.4v
10 4.4v
11 0v
12 4.7v
13 4.2v
14 7.2v

In relative terms, I can't see anything amiss with yours... the fact it did work then didn't says to me either a bad solder joint or the 4009 must have blown so I guess, re-flow the board and if that doesn't work, swap the chip out.
Works at Lectric-FX

Vivek_rc

Quote from: Scruffie on April 15, 2021, 09:48:38 PM
Here are approximate voltages from Haberdashers build;
IC1
1 4.5v
2 4.5v
3 4.5v
4 0
5 4.5v
6 4.5v
7 5v
8 8.5v

IC2
1 4.5v
2 4.5v
3 4.5v
4 0
5 4.5v
6 4.5v
7 5v
8 8.5v

IC3
1 4.5v
2 4.5v
3 4.5v
4 0
5 4.5v
6 4.5v
7 4.5v
8 8.5v

IC4
1 4.5v
2 4.5v
3 4.5v
4 0
5 4.5v
6 4.5v
7 4.5v
8 8.5v

IC5
1 6v
2 4.6v
3 6v
4 4.5v
5 6v
6 4.5v
7 6v
8 4.5v
9 6v
10 4.5v
11 6v
12 4.5v
13 0
14 6v
15 4.5v
16 6v

IC6 - This chip is LFO so voltages will be shifting around a lot, but you should be getting around 8.5v on pin 4 and pin 11 will be ground.
1 3.3v
2 4.4v
3 4.9v
4 8.5v
5 4.2v
6 4.2v
7 5v
8 4v
9 4.4v
10 4.4v
11 0v
12 4.7v
13 4.2v
14 7.2v

In relative terms, I can't see anything amiss with yours... the fact it did work then didn't says to me either a bad solder joint or the 4009 must have blown so I guess, re-flow the board and if that doesn't work, swap the chip out.
Thanks Scruffie, I'll reflow the board. I've also ordered another 4009 but might take a few weeks to receive it. Might be able to get a cd4049ube from a local store and test it out. Thanks again for your help. Will report back on how I go.

Thanks

Vivek_rc

Must be my lucky day, local electronics store next to my sons daycare had 4009UBE, picked up 3 just in case!

jimilee

Quote from: Vivek_rc on April 16, 2021, 12:06:25 AM
Must be my lucky day, local electronics store next to my sons daycare had 4009UBE, picked up 3 just in case!

I'm jealous, we got no electronics stores anymore.
Pedal building is like the opposite of sex.  All the fun stuff happens before you get in the box.

Vivek_rc

Quote from: jimilee on April 16, 2021, 12:14:39 AM
Quote from: Vivek_rc on April 16, 2021, 12:06:25 AM
Must be my lucky day, local electronics store next to my sons daycare had 4009UBE, picked up 3 just in case!

I'm jealous, we got no electronics stores anymore.
We have a local chain in Australia called Jaycar and they have a good selection, but pricey compared to tayda, but a big help that I can pop in when I run out of a specific component or two.

Vivek_rc

Got success, I swapped out the 4009 and the 324, now I get a nice phaser and vibe. Not sure which one is busted! not sure if I'm game to swap them out now and break things again! Thanks again for all the help Scruffie!