Bearfoot - Model H [traced]
- WhiteKeyHole
- Cap Cooler
Can I get the Dale resistor values? Thanks!
- WhiteKeyHole
- Cap Cooler
Also, could I get some information about the gain and tone potentiometer wiring? I have my assumptions down now but would like to be sure.
- WhiteKeyHole
- Cap Cooler
Never mind, missed the pictures somehow. Sorry.
- culturejam
- Old Solderhand
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The 5-bands are Vishay CCF-55 series. I love those! I use them in a lot of my builds.WhiteKeyHole wrote:Can I get the Dale resistor values? Thanks!
Yes, I know that's not what you were asking about, but I just had to comment.
- WhiteKeyHole
- Cap Cooler
Thanks. What's the resistor just above the 4n7 capacitor? Is "R4" 22K?
That should be it, thanks for all the help.
That should be it, thanks for all the help.
- WhiteKeyHole
- Cap Cooler
As always, there may be revisions.
- Attachments
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- mhr1.png (9.79 KiB) Viewed 7775 times
- Jack Deville
- Resistor Ronker
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Re: schematic above:
I don't think the connections on Q3 and Q4 are correct.
I don't think the connections on Q3 and Q4 are correct.
- WhiteKeyHole
- Cap Cooler
Yeah, I think it's suspect. Went by what I can see, though.
- WhiteKeyHole
- Cap Cooler
He uses them in the same way in the Fire Red Fuzz,
- WhiteKeyHole
- Cap Cooler
Wait, never mind. Why don't you think it's correct? Makes sense to me...
- Jack Deville
- Resistor Ronker
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N channel JFETs' drain and source tied together?
Drain and source to ground at Q3, bypassed entirely at Q4?
Explain how this makes sense.
- RnFR
- Old Solderhand
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yeah, that doesn't look right. maybe check the pinouts?
"You've converted me to Cubic thinking. Where do I sign up for the newsletter? I need to learn more about how I can break free from ONEism Death Math." - Soulsonic
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- WhiteKeyHole
- Cap Cooler
I did check the pin arrangement, would be foolish not to. Anyway, seems like a diode to me. Gate being the anode, drain/source being the cathode. To quote Wikipedia, "The gate(G) (control) terminal has doping opposite to that of the channel, which surrounds it, so that there is a P-N junction at the interface."
What am I missing? How else are you going to use a JFET as a diode?
What am I missing? How else are you going to use a JFET as a diode?
- WhiteKeyHole
- Cap Cooler
Other than using it as a current source.
- WhiteKeyHole
- Cap Cooler
- RnFR
- Old Solderhand
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easy buddy. I stand corrected, you can do it that way. but I'm used to seeing it one of these two ways, usually the one on the left.
http://www3.hi.is/~voe1/Posted/jFET_clip_cir.jpg
http://www3.hi.is/~voe1/Posted/jFET_clip_cir.jpg
"You've converted me to Cubic thinking. Where do I sign up for the newsletter? I need to learn more about how I can break free from ONEism Death Math." - Soulsonic
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- WhiteKeyHole
- Cap Cooler
J1 and J2 are, basically, the same configuration found in the Model H. J3 and J4 are the other method I mentioned, the JFETs are configured as current sources (regulators, limiters, what have you).
- culturejam
- Old Solderhand
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I thought the same thing at first about having the drain and source tied together, but apparently it works that way as well as a diode.RnFR wrote:easy buddy. I stand corrected, you can do it that way. but I'm used to seeing it one of these two ways, usually the one on the left.
http://www3.hi.is/~voe1/Posted/jFET_clip_cir.jpg
- WhiteKeyHole
- Cap Cooler
Yeah, R15.
- earthtonesaudio
- Transistor Tuner
A JFET wired like that makes a "low leakage" diode. You'll sometimes see them used in low-drift peak detectors or sample/hold circuits.
rocklander wrote:hairsplitting and semantics aren't exactly the same thing though.. we may need two contests for that.