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Building How-to » Duo Distortor » 2nd attempt at the Jade
2nd attempt at the Jade [message #2185] Wed, 22 April 2009 11:34 Go to next message
benlindell is currently offline benlindell
Messages: 9
Registered: December 2008
Junior Member
I built my second try of the Fuzz Jade, I did the first one on cardboard and figured I must have mucked up the point to point stuff, so I did the second one on perf board. Same thing, no sound whatsoever.

I started probing around and the farest the signal seems to go is to the junction of the first transistor and the 100k resistor, after that the signal appears nowhere else. Any ideas what it may be?

Thanks,

ben
http://www.benlindell.com
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Re: 2nd attempt at the Jade [message #2186] Wed, 22 April 2009 12:01 Go to previous messageGo to next message
benlindell is currently offline benlindell
Messages: 9
Registered: December 2008
Junior Member
a couple of pictures, it's not the neatest job I've ever done but I didn't see anything shorting.

http://benlindell.com/fuzz1.jpg

http://benlindell.com/fuzz2.jpg

I already checked the power and the +9 rail is getting 8.69 and the ground is fine as well.

ben
http://www.benlindell.com
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Re: 2nd attempt at the Jade [message #2188] Thu, 23 April 2009 01:26 Go to previous messageGo to next message
dann is currently offline dann
Messages: 772
Registered: December 2002
Location: Austin TX
Senior Member
what transistors are you using? it may be possible they have reversed pin-outs

Measure the voltages at each pin on each transistor. If the signal is only making it to the base of the first xistor, that's not very far!

[Updated on: Thu, 23 April 2009 01:33]

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Re: 2nd attempt at the Jade [message #2189] Fri, 24 April 2009 15:46 Go to previous messageGo to next message
benlindell is currently offline benlindell
Messages: 9
Registered: December 2008
Junior Member
They are 2N3904, I measured them as (0,.17, .26) (.82, .26, .19) (.89, .19, .17)

-ben
http://www.benlindell.com
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Re: 2nd attempt at the Jade [message #2190] Fri, 24 April 2009 20:17 Go to previous messageGo to next message
dann is currently offline dann
Messages: 772
Registered: December 2002
Location: Austin TX
Senior Member
sounds like the transistors aren't getting power. Trace the power rail starting at the power source positive. looking at the photo it could be a non-connection at one of the V+ junctions

[Updated on: Fri, 24 April 2009 20:18]

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Re: 2nd attempt at the Jade [message #2305] Mon, 07 September 2009 23:02 Go to previous messageGo to next message
benlindell is currently offline benlindell
Messages: 9
Registered: December 2008
Junior Member
Sorry for the delay in getting back, turns out I had the power rails reversed. Fixed that but now I still get no signal passing except on bypass. The Mud knob changes the frequency of a low level oscillation, did I mess up the transistors by giving them reversed power or is it something else?

Thanks,

Ben
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Re: 2nd attempt at the Jade [message #2317] Mon, 28 September 2009 13:29 Go to previous message
dann is currently offline dann
Messages: 772
Registered: December 2002
Location: Austin TX
Senior Member
What are your voltages on each pin of the transistors? Sorry I don't have a reference table for these, but in general you're looking for 0.6V difference between base (center) and emitter (left side when holding the transistor so you can read the words).
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