Author Topic: My univox super fuzz pedal kit won't work  (Read 9666 times)

antonis

Re: My univox super fuzz pedal kit won't work
« Reply #220 on: May 05, 2021, 04:45:35 PM »
According to your photo markings, ALL transistor legs exhibit signal where Q2 Collector and Q4 & Q5 Emitters shouldn't..
"I'm getting older while being taught all the time" Solon the Athenian..
"I don't mind  being taught all the time but I do mind a lot getting old" Antonis the Thessalonian..

Kevin Mitchell

Re: My univox super fuzz pedal kit won't work
« Reply #221 on: May 05, 2021, 04:47:04 PM »
Wow this has been onging, huh?!

You need to reflow every single solder joint. I suggest getting some flux so you're not just piling on more solder. Make the iron hotter next time if you can.

Here I am. Wondering why there's only 3 spots with no signal :icon_lol:
Orange = red I guess.

You don't have to probe the entire board. Just where the guitar signal travels. Check for guitar signal on the middle pin (base "B") of each transistor. Where it disappears is approximately where the problems are.

The transistors are 2N2222A, correct?

Forgive any ignorance. There's a lot here.
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snow123

Re: My univox super fuzz pedal kit won't work
« Reply #222 on: May 05, 2021, 05:18:56 PM »
yep im using 2n2222a's.

snow123

Re: My univox super fuzz pedal kit won't work
« Reply #223 on: May 05, 2021, 05:40:40 PM »
wait i thought all transistors let the signal through lol. this is how it actually is:


green = signal goes through
red = signal doesnt go through
grey = very, very quiet and weak signal goes through

Kevin Mitchell

Re: My univox super fuzz pedal kit won't work
« Reply #224 on: May 05, 2021, 07:56:02 PM »
Did we verify that the transistors have the correct pinout?
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snow123

Re: My univox super fuzz pedal kit won't work
« Reply #225 on: May 05, 2021, 08:35:15 PM »
im pretty sure yea

Kevin Mitchell

Re: My univox super fuzz pedal kit won't work
« Reply #226 on: May 05, 2021, 08:59:07 PM »
I looked up the pinout and got EBC as well as CBE. The transistors in the GGG build document photo are backwards compared to yours.
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snow123

Re: My univox super fuzz pedal kit won't work
« Reply #227 on: May 05, 2021, 09:16:25 PM »
they're p2n2222a's instead of 2n2222a's.

snow123

Re: My univox super fuzz pedal kit won't work
« Reply #228 on: May 05, 2021, 09:16:51 PM »
im using 2n2222a's

Kevin Mitchell

Re: My univox super fuzz pedal kit won't work
« Reply #229 on: May 05, 2021, 09:56:03 PM »
What about the note in bold on the first page.
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snow123

Re: My univox super fuzz pedal kit won't work
« Reply #230 on: May 05, 2021, 10:49:55 PM »
the kit comes with p2n2222as. the p2n2222as are CBE and 2n2222as are EBC.

Kevin Mitchell

Re: My univox super fuzz pedal kit won't work
« Reply #231 on: May 05, 2021, 11:02:37 PM »
Can you send me a link to where you had sourced the 2N2222A transistors?

There are photos on google showing mixed info. I'm wondering if the pinout varies between manufacturers. At this point I highly recommend you first hand verify the pinouts.

And again, address the solder joints. Practice makes perfect just don't spend too much time in one spot or you'll lose another pad.
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bluebunny

Re: My univox super fuzz pedal kit won't work
« Reply #232 on: May 06, 2021, 03:25:25 AM »
We're twelve pages in.  Could we not simply have *tested* the transistor pinouts by now?
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duck_arse

Re: My univox super fuzz pedal kit won't work
« Reply #233 on: May 06, 2021, 04:35:27 AM »
We're twelve pages in.  Could we not simply have *tested* the transistor pinouts by now?

I thought we'd decided on the transistors a few pages back.

please - can we have a photo of the transistors showing the markings on, nice and clear?

2N = metal can, PN = plastic pack.
"You ain't seen me, right?"

antonis

Re: My univox super fuzz pedal kit won't work
« Reply #234 on: May 06, 2021, 05:36:30 AM »
We're twelve pages in.  Could we not simply have *tested* the transistor pinouts by now?

We were only eleven pages in just to decide what "grounded item" is..
Those things need their time.. :icon_wink:
« Last Edit: May 06, 2021, 06:15:02 AM by antonis »
"I'm getting older while being taught all the time" Solon the Athenian..
"I don't mind  being taught all the time but I do mind a lot getting old" Antonis the Thessalonian..

Kevin Mitchell

Re: My univox super fuzz pedal kit won't work
« Reply #235 on: May 06, 2021, 08:23:26 AM »
2N = metal can, PN = plastic pack.
Are you sure all 2Ns are metal can?

There's P2N2222A in plastic as well. I wonder if the full part number isn't printed on the package - similar to a lot of PBFREE stuff I have been seeing. Which is why I'm hoping to find a datasheet on the product page that the OP had used.

This is the page that made me suspect pinout variants between manufacturers.
Shows this image;


I could be wrong! The web page could be wrong. But it's best to be 100% so we're not chasing our own tail here. I can appreciate that the OP is still going at it!
« Last Edit: May 06, 2021, 08:40:21 AM by Kevin Mitchell »
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Kevin Mitchell

Re: My univox super fuzz pedal kit won't work
« Reply #236 on: May 06, 2021, 09:41:14 AM »
snow123, here's how we can determine the pinouts with a multimeter. It's best to use one of the spare transitors that you presumably have.

With NPN transistors the forward bias of base to emitter is greater than base to collector.
In diode testing setting, put the black probe to the base lead - we know it's pin two in either variant here. Place the red probe on pin one, record the reading. Now place the red probe on pin 3 and record the reading. The higher reading is the emitter.
« Last Edit: May 06, 2021, 11:40:18 AM by Kevin Mitchell »
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duck_arse

Re: My univox super fuzz pedal kit won't work
« Reply #237 on: May 06, 2021, 11:04:59 AM »
2N = metal can, PN = plastic pack.
Are you sure all 2Ns are metal can?


well you got me there - that's a something I've not seen. any idea the manufacturor? do they have a datasheet?

There's P2N2222A in plastic as well. I wonder if the full part number isn't printed on the package - similar to a lot of PBFREE stuff I have been seeing. Which is why I'm hoping to find a datasheet on the product page that the OP had used.

but a "P2Nxxxx" is neither a PNxxxx nor a 2Nxxxx, it's a rare and specific type P2Nxxxx, probably with a Motorola datasheet somewhere setting out why the differences.

back about page 2 is this pic showing those 2N2222A - are they still fitted?



as for the 2N's only being metal cans, well, I don't know what I know anymore.
"You ain't seen me, right?"

antonis

Re: My univox super fuzz pedal kit won't work
« Reply #238 on: May 06, 2021, 11:06:39 AM »
In diode testing setting, put the red probe to the base lead ..

  ::) ::)  >:(
"I'm getting older while being taught all the time" Solon the Athenian..
"I don't mind  being taught all the time but I do mind a lot getting old" Antonis the Thessalonian..

Kevin Mitchell

Re: My univox super fuzz pedal kit won't work
« Reply #239 on: May 06, 2021, 11:40:47 AM »
In diode testing setting, put the red probe to the base lead ..

  ::) ::)  >:(
Oops  :icon_lol: Fixed it.
The guide I was breaking down went from NPN to PNP without much of a notice.

duck_arse;
I can't find a datasheet for the proclaimed CBE, plastic devices. The photo is pretty generic, found on amazon, ebay, walmart, alibaba. Manufacturer shows "unbranded" almost everywhere. So I can't verify my suspicions, only take the lead from other findings on the web. Which could be wrong. But it's a hell of a mistake for an article.
« Last Edit: May 06, 2021, 11:45:27 AM by Kevin Mitchell »
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