FAO: Doog/Euan (Also Mike) Chunky Cheese Inside

Fibus · Post by **Fibus** » Tue Jul 15, 2008 5:16 pm

As to not take over Mike's Pedal thread i thought i would post this here. Its a video of the noise my Chunky Cheese (which is of the Babybell variety) makes when you turn the fuzz all the way up.

[youtube][/youtube]

(I've turned the amp up more than i normally would just so you can hear the sound better)

I thought it was normal that it did this. Is is not? What is wrong with it? And why can't i build one god damn pedal without something going wrong with it?

I works fine otherwise (though i thought this was normal so i don't know why i say "otherwise"), fuzz is class, great pedal!

NickS · Post by **NickS** » Tue Jul 15, 2008 6:58 pm

Sounds like "motorboating", a sort of feedback you can get if your power isn't adequately decoupled (smoothed). Do you have a resistor in line with the power and a large smoothing capacitor after? You may need to add another smoothing cap somewhere along the power rail; sometimes they use a resistor and cap for each stage in preamps.

Fibus · Post by **Fibus** » Tue Jul 15, 2008 7:18 pm

There are 2 22uf caps after the power output, OLC only sent me on 22uf cap so i went to maplin and the guy assured me that the one he gave me would work the same it was a 22uf one as well, maybe he was wrong?

Why would this only happen on the fuzz knob though?

Post by **Doog** » Tue Jul 15, 2008 9:45 pm

Almost sounds like it's starting to self-oscillate.. can't help you though dude- Euan put mine together for me (<3), and I don't have that problem :/

NickS · Post by **NickS** » Tue Jul 15, 2008 9:56 pm

Fibus wrote:There are 2 22uf caps after the power output, OLC only sent me on 22uf cap so i went to maplin and the guy assured me that the one he gave me would work the same it was a 22uf one as well, maybe he was wrong?

No, should be OK.

Why would this only happen on the fuzz knob though?

Circuit layout, stage gain, load impedance.... Looks like you'll have to wait for Doog and Mike's experience, sorry.

Fibus · Post by **Fibus** » Tue Jul 15, 2008 10:21 pm

Doog wrote:Almost sounds like it's starting to self-oscillate.. can't help you though dude- Euan put mine together for me (<3), and I don't have that problem :/

Lucky you. Though i honestly i'm not that worried about it, i didn't even think it was a problem until you said it wasn't happening for you. It would be nice not to have it though.

Thanks for the help Nick, hopefully its not something too big.

Paging Euan to the thread!

Ninja Mike 808 · Post by **Ninja Mike 808** » Tue Jul 15, 2008 11:42 pm

Good to know you like it regardless of the noise. I can ask my boss what's up, if you haven't already?

Edit: My boss said if you wanna contact him, he'll be willing to help you...

Post by **Mike** » Wed Jul 16, 2008 8:17 am

I would check all solder joints for continuity, especially on your selector switch.

Fibus · Post by **Fibus** » Wed Jul 16, 2008 9:01 am

Ninja Mike 808 wrote:Good to know you like it regardless of the noise. I can ask my boss what's up, if you haven't already?

Edit: My boss said if you wanna contact him, he'll be willing to help you...

You work for OLC? Nice one, that would be class job. If you pm me his email i'll get onto him but honestly it not a huge deal, i love the pedal and i didn't think this was a problem until Doog mentioned it didn't happen on his.

Fibus · Post by **Fibus** » Wed Jul 16, 2008 9:02 am

Mike wrote:I would check all solder joints for continuity, especially on your selector switch.

I've gave them the once over before i put it all together, everything seemed to be fine but a second look wouldn't hurt. I just wish i could narrow it down more.

Post by **Mike** » Wed Jul 16, 2008 9:03 am

Fibus wrote:
Mike wrote:I would check all solder joints for continuity, especially on your selector switch.
I've gave them the once over before i put it all together, everything seemed to be fine but a second look wouldn't hurt. I just wish i could narrow it down more.

I had some oscillation on my Orange Peel from cold solder joints, I'm pretty confident that's what you have. They might look ok, but there'll be one in there.

Post by **Doog** » Wed Jul 16, 2008 9:09 am

Does it happen on the other modes with the gain up?

Fibus · Post by **Fibus** » Wed Jul 16, 2008 9:09 am

Mike wrote:
Fibus wrote:
Mike wrote:I would check all solder joints for continuity, especially on your selector switch.
I've gave them the once over before i put it all together, everything seemed to be fine but a second look wouldn't hurt. I just wish i could narrow it down more.
I had some oscillation on my Orange Peel from cold solder joints, I'm pretty confident that's what you have. They might look ok, but there'll be one in there.

How do i find them if they look ok?

Fibus · Post by **Fibus** » Wed Jul 16, 2008 9:10 am

Doog wrote:Does it happen on the other modes with the gain up?

It happens in all modes but is most noticeable in the mid-boost mode so thats the one i demoed

Post by **Mike** » Wed Jul 16, 2008 9:10 am

Multimeter baby. check continuity between the solder joint and what is connected to it.

Also waggle waggle

Waggle Waggle that steez

There should be no visible movement of leads/pins in the solder.

Ninja Mike 808 · Post by **Ninja Mike 808** » Wed Jul 16, 2008 9:12 am

What's ground hum in the UK? In the US we call it 60 cycle hum... My guess is that something is being grounded out, but it sounds awfully high pitch for that.

Post by **Mike** » Wed Jul 16, 2008 9:14 am

50Hz.

It's not Ground Hum.

Fibus · Post by **Fibus** » Wed Jul 16, 2008 9:15 am

Waggle Waggle it is! If i don't post in this thread tomorrow assume i have died from electrocution.

Post by **Mike** » Wed Jul 16, 2008 9:15 am

If 9V kills you, then you're a pussy.

Fibus · Post by **Fibus** » Wed Jul 16, 2008 9:37 am

I forgot it was only 9v, sure thats almost fun