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Hornet debuggin' (in the key of G#)


 
1/3/2001 8:49 PM
Martin Bertrand
email
Hornet debuggin' (in the key of G#)
Happy new year to everyone.  
 
 
 
I just finished the HORNET during the holidays (Thanks to Aron and to other that helped develop this circuit) and I have a couple of problems.  
 
 
 
1- The unit squeals at high gain. I read that i should use a capacitor somewhere but since I do not fully understand electronics I could do with a little help.  
 
 
 
2- I was wondering if I could use two Ge transistors instead of the proposed ge-si combinations. What collector voltages should I be looking for ? What could be good starting values for the trimpots ?  
 
 
 
3- The bass response of my guitar (Gibson with 500T Humbucker) is gone. The input capacitor is 0,01 microf and the output cap is 0,1. What cap values or type could solve the problem?  
 
 
 
Martin Bertrand, Alma, Canada
 
1/3/2001 8:59 PM
aron
email

>The unit squeals at high gain. I read that i should use a capacitor somewhere but since I do not fully understand electronics I could do with a little help.  
 
Keeps the input and output wires far apart as possible. Use shielded wires if you can - that should fix it. Shield only one side of the wire.  
 
> I was wondering if I could use two Ge transistors instead of the proposed ge-si combinations.  
 
Yep, start the trims at center and then adjust to taste.  
 
>The bass response of my guitar (Gibson with 500T Humbucker) is gone.  
 
The input cap can go from .01uF to 47uF - larger values more bass and different tone.  
 
You can increase the output cap if you want as well.
 
 
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1/3/2001 9:01 PM
Joe Gagan
email
PNP/NPN
Don't forget to stay PNP or npn, whichever you built!
 
1/4/2001 2:19 AM
Martin Bertrand
email
Hornet input cap
Thanks a lot for your answers.  
 
 
 
Is there information somewhere about the influence of the input cap on the frequency response of a circuit like this one ?  
 
 
 
Martin
 
1/4/2001 2:31 AM
aron
email

Well,  
 
The Hornet is a Fuzz Face, so R.G.'s article on the Fuzz Face at GEO is a start. However, coupling capacitors effect the frequency response of any circuit. In other words, for any circuit, you can reduce bass by making the coupling caps smaller. You can also introduce bass response to a circuit but only to a point.
 
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