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DIYstompboxes.com  |  Projects  |  Beginner Project  |  NPN Booster turned into distortion not distorting :( 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: NPN Booster turned into distortion not distorting :(  (Read 3546 times)
smoguzbenjamin
Posts: 2718

Ben Allen


NPN Booster turned into distortion not distorting :(
« on: November 22, 2003, 12:12:45 PM »

Hey guys!

I took the booster, and added two diodes (1N4148) back to back to ground -> see schematic:

http://scorpius.spaceports.com/~ubermaus/guitar/npnds.html

But it ain't distorting, boosting, or whatever...  :cry: I went over every solder joint, every part that could go wrong, it's fine. I replaced the transistor with one that I know that works, no difference. I suspect a bad part... Where and what do I measure, guys?

Oh btw I have an el-cheapo multimeter that doesn't have a continuity meter....  :?
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I don't like Holland. Nobody has the transistors I want.
aron
Administrator
Posts: 10226

Aron Nelson


NPN Booster turned into distortion not distorting :(
« Reply #1 on: November 22, 2003, 05:55:18 PM »

Max the boost and turn down the 10K output volume pot.

It should distort then.
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smoguzbenjamin
Posts: 2718

Ben Allen


NPN Booster turned into distortion not distorting :(
« Reply #2 on: November 23, 2003, 04:53:49 AM »

Hmmm, I've just realized that turning the boost pot doesn't do diddly squat... I'm gonna have to resolder everything Sad Oh well, here's to another day of debugging. At least I learn something when I debug stuff Smiley
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I don't like Holland. Nobody has the transistors I want.
aron
Administrator
Posts: 10226

Aron Nelson


NPN Booster turned into distortion not distorting :(
« Reply #3 on: November 23, 2003, 01:56:11 PM »

No, don't redo the whole thing, just the pot to ground and capacitor.
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smoguzbenjamin
Posts: 2718

Ben Allen


NPN Booster turned into distortion not distorting :(
« Reply #4 on: November 24, 2003, 07:32:55 AM »

I tried the volume pot all the way down to ground, this just shuts the pedal up. Also when I turn the boost, it doesn't make anything happen. Not even with the volume pot disconnected. I'm starved for ideas on what's wrong  :cry:
Logged

I don't like Holland. Nobody has the transistors I want.
aron
Administrator
Posts: 10226

Aron Nelson


NPN Booster turned into distortion not distorting :(
« Reply #5 on: November 24, 2003, 10:13:45 AM »

Somehow you have the boost pot miswired.

Can you take a picture and send it to me?
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smoguzbenjamin
Posts: 2718

Ben Allen


NPN Booster turned into distortion not distorting :(
« Reply #6 on: November 24, 2003, 11:40:30 AM »

Hmmmm. I donno when my sister-in-law will be home, she's the only one with a digital camera... Or maybe I'll bring the NPNbooster to a friend or something... I'll see, and try and get you the pic as fast as I can. As for me, I'm going to rewire the boost pot  Smiley
Logged

I don't like Holland. Nobody has the transistors I want.
aron
Administrator
Posts: 10226

Aron Nelson


NPN Booster turned into distortion not distorting :(
« Reply #7 on: November 24, 2003, 02:36:22 PM »

OK.

If I saw what you had, I could probably figure it out.

Aron
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smoguzbenjamin
Posts: 2718

Ben Allen


NPN Booster turned into distortion not distorting :(
« Reply #8 on: November 25, 2003, 08:31:52 AM »

I'm gonna get a pic as soon as I can, don't know when that'll be though  :cry:
Logged

I don't like Holland. Nobody has the transistors I want.
aron
Administrator
Posts: 10226

Aron Nelson


NPN Booster turned into distortion not distorting :(
« Reply #9 on: November 25, 2003, 10:29:04 AM »

Do you have a scanner?

Put the circuit right on it and scan.
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