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PostPosted: Thu Aug 16, 2012 9:14 pm 
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I was poking through my Eagle repository just now and realized I'd drawn up a schematic for the old Tonebender MKII silicon version.

I already baned out a layout, but have a look and see if there is anything amiss. I'm thinking maybe a collector-base cap (470p) on Q1 would give it a more authentic "germanium tone"? Who knows. :lol:

FINAL SCHEMATIC IS FURTHER DOWN

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Last edited by culturejam on Mon Oct 15, 2012 3:09 pm, edited 1 time in total.

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PostPosted: Fri Aug 17, 2012 4:56 am 
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What the heck is a SS9013 when its at home?? :lol:

Mictesters one over at FSB is really nice (similar to Doug Hammond's Hot Silicon) also his varient with the James tonestack (hate the Muff tonestack, have I mentioned that before? :lol: ), they are the ones I'd look to for refinements. Whats C4 all about then?

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PostPosted: Fri Aug 17, 2012 8:01 am 
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kaycee wrote:
What the heck is a SS9013 when its at home?? :lol:

It's a cheap-but-good transistor with nice low gain (between 100 and 120 hFE).

kaycee wrote:
Whats C4 all about then?

Not really sure. I saw it in the attached schematic by our friend Dragonfly.

Attachment:
TONEBENDER_NPN_SILICON_DRAGONFLY_VE.gif
TONEBENDER_NPN_SILICON_DRAGONFLY_VE.gif [ 47.75 KiB | Viewed 10160 times ]

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PostPosted: Sun Aug 19, 2012 10:24 pm 
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C4 filters out some high end.

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PostPosted: Sun Aug 19, 2012 10:33 pm 
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I'm always in for some silicon foxzys that bends over! 8)

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After reflowing and several attempts at signal tracing and switch testing I plugged in the power.


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PostPosted: Mon Aug 20, 2012 4:04 am 
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1 trimmer each, nice. I need to build up something like this after my frustrating DEAD lil angel...

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PostPosted: Mon Aug 20, 2012 4:58 am 
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Since we're final/y asking questions about circuits, not debating the non-existance of God...
Why does Dragonfly's have a diode at the base of Q2?

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PostPosted: Mon Aug 20, 2012 9:34 am 
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Check out this page for an explanation of the diode:
http://www.diystompboxes.com/analogalch ... ulcan.html

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PostPosted: Sat Aug 25, 2012 4:52 pm 
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I'm totally down for a few of these!

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PostPosted: Mon Oct 15, 2012 3:04 pm 
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Circuit is verified. I also added a collector-base feedback cap on Q1 to give it more faux leakage for bias purposes and old-school mojo.


Note: Low-gain transistors can be used Q1-Q3. No specific parts are required. I chose two very low-gain trannies for Q1/Q2 and a higher-gain, lower-noise tranny for Q3. But just about anything should work.


Here's the final:

Attachment:
MKII_v1-1.png
MKII_v1-1.png [ 5.94 KiB | Viewed 9878 times ]

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PostPosted: Tue Oct 16, 2012 12:20 am 
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Culturejam, that is the nicest layout I have ever seen, so easy to read!
C

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PostPosted: Mon Oct 22, 2012 2:49 pm 
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I tested 100 2n3904 from tayda.

All read between 290-310. Anyone else getting these with gain that high? I am guessing that is too high for this tonebender or just about anything else I bought them for.?!...

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PostPosted: Mon Oct 22, 2012 3:49 pm 
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atreidesheir wrote:
I tested 100 2n3904 from tayda.

All read between 290-310. Anyone else getting these with gain that high? I am guessing that is too high for this tonebender or just about anything else I bought them for.?!...


Give me a sec, i'll check out.........i ordered some lately.

Maybe you could look at 2N2222 if you have some.......not absolutely sure...just a sec, will post in couple minutes

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Comfort Player wrote:
After reflowing and several attempts at signal tracing and switch testing I plugged in the power.


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PostPosted: Mon Oct 22, 2012 3:58 pm 
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So!

I picked 5 2N3904 and they'Re all between 340 and 370

PN2222A are around 230...

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Comfort Player wrote:
After reflowing and several attempts at signal tracing and switch testing I plugged in the power.


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PostPosted: Mon Oct 22, 2012 5:15 pm 
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alright! I was shocked mine were SO consistently high. I have 2n2222. thanks

I need to find some cheap very low gain (consistent) silicon.

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PostPosted: Mon Oct 22, 2012 6:55 pm 
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found this website for the first time.

http://www.hawestv.com/amp_projects/fuzzbox/fuzz4.htm#stabilizer
good info about adjusting transistor gain by sizing emitter resistors. specified for fuzzface, but just as useful in these gain stages. And I know they are the same stages basically. I assume someone may not know already. :P

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