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November 24, 2014, 07:39:40 PM
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DIYstompboxes.com  |  DIY Stompboxes  |  Building your own stompbox  |  Madbean Zombii not oscillating 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: Madbean Zombii not oscillating  (Read 623 times)
Richard6
Posts: 22


Madbean Zombii not oscillating
« on: May 17, 2012, 12:20:54 PM »

I can't seem to figure out why I can't get the Zombii to squeal. Q1 is a 2n3904. Q2 is a GE with 99 Hfe and Q3 is a GE with 160 Hfe. Is this too high for both spots? Also, will changing the 47k feedback resistor help any?
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sgmezei
Posts: 90


Re: Madbean Zombii not oscillating
« Reply #1 on: May 17, 2012, 01:58:55 PM »

Are Q2 and Q3 Germanium PNP transistors?
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Richard6
Posts: 22


Re: Madbean Zombii not oscillating
« Reply #2 on: May 17, 2012, 02:15:56 PM »

Yes, they are a matched Fuzz Face set from Smallbear.
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sgmezei
Posts: 90


Re: Madbean Zombii not oscillating
« Reply #3 on: May 19, 2012, 03:50:56 PM »

are you able to post any pictures of your board? I know mine squeals like a banshee.
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Richard6
Posts: 22


Re: Madbean Zombii not oscillating
« Reply #4 on: May 19, 2012, 08:06:55 PM »

I could....but I don't think it would help. It did the same thing when it was on the breadboard. I used pots out of my parts bin that were ripped out of an old stereo. I've got some new pots and Ge trannies on order. Funny thing...I hate it when my Dr Boogie squeals!
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