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Topic: Fuzz Factory Debug Help (Read 209 times)
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hall1k
Posts: 7
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Hello, I'm working on my first build, a Fuzz Factory clone. All my parts are from Small Bear, and I've followed the schematic exactly and a layout that my uncle, who is an electrical engineer and a VP of Spectra Energy (natural gas company), produced for me, so i trust that it's correct. The only substitution I've made was using the OC76 Ge transistors in place of the AC128s, which were from Small Bear also. I'm having some trouble though. As well, I am not using a battery, just a DC adapter, and no LED either. I am using the Taiwan Blue 3PDT from Small Bear. For now, I'm just trying to get the true bypass working, but all I can get is a very loud buzzing (sounds like mains hum) with or without the guitar connected. When switched on, the pedal does nothing at all, not even any buzzing. Once I can get the true bypass working, I'll worry about the board itself, so at that point I'll go through the whole measuring voltages thing. I have the true bypass hooked up according to this guide: http://gaussmarkov.net/wordpress/thoughts/wiring-up-a-1590b/ |
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therecordingart
Posts: 269
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Hello, I'm working on my first build, a Fuzz Factory clone. All my parts are from Small Bear, and I've followed the schematic exactly and a layout that my uncle, who is an electrical engineer and a VP of Spectra Energy (natural gas company), produced for me, so i trust that it's correct. The only substitution I've made was using the OC76 Ge transistors in place of the AC128s, which were from Small Bear also. I'm having some trouble though. As well, I am not using a battery, just a DC adapter, and no LED either. I am using the Taiwan Blue 3PDT from Small Bear. For now, I'm just trying to get the true bypass working, but all I can get is a very loud buzzing (sounds like mains hum) with or without the guitar connected. When switched on, the pedal does nothing at all, not even any buzzing. Once I can get the true bypass working, I'll worry about the board itself, so at that point I'll go through the whole measuring voltages thing. I have the true bypass hooked up according to this guide: http://gaussmarkov.net/wordpress/thoughts/wiring-up-a-1590b/So with the switch bypassed it doesn't pass your guitar signal and with it engaged you get a loud buzzing? Can you take a picture of the guts and your switch wiring? |
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hall1k
Posts: 7
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Actually, I get the buzzing with the switch bypassed, but it does not pass the signal. With the switch engaged I get nothing at all. Unfortunately, I don't have access to a camera. I will draw a little diagram in paint and upload it tho. The jacks are grounded to the negative on the DC jack. I have tested that I have the correct polarity on the dc jack. edit: here it is  |
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« Last Edit: July 29, 2010, 01:47:30 PM by hall1k »
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therecordingart
Posts: 269
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That's right. I'd double check that the connections to the jacks are going to the tip and not the ring or sleeve. Also make sure that the tabs on the jacks aren't grounding to the enclosure.
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hall1k
Posts: 7
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Its not in an enclosure atm. Its just sitting on a desk like a big jumble of wires... I connected the two jacks directly together to make sure they worked, and they worked fine. I'm really puzzled cause the bypass still doesn't work... I when the switch is off, there is indeed a small resistance across the bypass wire, though that could just be the wire itself... I'm really at my wits end here lol.
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ppatchmods
Posts: 487
John Pennington
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how do you have you grounds run from the board?
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When your life is over, will any of this STUFF really matter?
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hall1k
Posts: 7
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They go to the negative on the DC jack. Oddly enough, I just tried the bypass again and it works... /shrug
Now for the board lol... Is it weird for a resistor to show a voltage on one end and zero volts on the other? it does not look blackened or anything, so I don't think I burnt it.
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ppatchmods
Posts: 487
John Pennington
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usually means it's bad
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When your life is over, will any of this STUFF really matter?
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tiges_ tendres
Posts: 1274
Steven M
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They go to the negative on the DC jack. Oddly enough, I just tried the bypass again and it works... /shrug
Now for the board lol... Is it weird for a resistor to show a voltage on one end and zero volts on the other? it does not look blackened or anything, so I don't think I burnt it.
No that's not bad. It might mean that one end of the resistor is grounded. |
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Try a little tenderness.
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