That capacitor determines the second gain stage, but I don't think going from 100pf to 120pf will make a big difference, you should be fine to use 120pf.
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Show posts MenuQuote from: jimilee on April 26, 2021, 12:43:54 PMThanks Jimi, I saw you post on this pedal as well during my build, the pictures helped me with ensuring the components were the right way around!
Great pedal. It's nice to someone else build one too.
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Quote from: jimilee on April 16, 2021, 12:14:39 AMWe 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.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.
Quote from: Scruffie on April 15, 2021, 09:48:38 PMThanks 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.
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.
Quote from: Thewintersoldier on April 15, 2021, 02:38:40 PMHaha, thanks Buddy. [emoji851]
I just wanna say that I wish everyone posted their voltages so cleanly, bravo!
Quote from: Scruffie on April 15, 2021, 12:24:09 PMHi Scruffie,
Can you post your voltages?
The 4009 is static sensitive, possible it got a zap and then crapped out.