Subsequent noob question... will a JFET work with a dual supply? I have +12v and -12v. The audio sits within this and "should" be biased at 0v. I ask this because of the two types of JFET "n-channel" and "p-channel". Does that designation only apply to the "switching aspect" of the JFET but the Drain and Source would allow +ve and -ve voltages?
Knock on subsequent noob question, is the hook up of a JFET in a dual supply system different to a single supply..?
Knock on subsequent noob question, is the hook up of a JFET in a dual supply system different to a single supply..?
Hi Guys
For shunt jfet switching only the relevant polarity for voltage control is required.
For series switching the control voltage must exceed the signal amplitude, meaning that a split-rail control voltage swing is needed for ground-referenced signals.
It makes no difference which sex of jfet you use with respect to the guidelines above. N offers much better on-resistance selection.
TUT explains all the basics about switching methods and types of devices.
Have fun
For shunt jfet switching only the relevant polarity for voltage control is required.
For series switching the control voltage must exceed the signal amplitude, meaning that a split-rail control voltage swing is needed for ground-referenced signals.
It makes no difference which sex of jfet you use with respect to the guidelines above. N offers much better on-resistance selection.
TUT explains all the basics about switching methods and types of devices.
Have fun
Do you mean that for a P-channel JFET I only need a positive voltage (of x) to voltage control the flow through the drain and source pins? and a negative voltage for an N-channel?
doesn't the gate voltage have to be negative or positive relative to the signal?
also
is the TUT information in a particular thread here?
Hi Guys
That's what it means for shunt switching. Signal polarity does not matter but its amplitude does.
TUT - The Ultimate Tone: a series of books about how guitar amps work, how to modify them for better sound, how to build them and wire them for best note articulation and lowest noise, and tonnes more. Most boutique amp builders got their courage to go into business from TUT. The major builders buy them too, and have slowly been changing how they do things. See my website londonpower.com
Have fun
That's what it means for shunt switching. Signal polarity does not matter but its amplitude does.
TUT - The Ultimate Tone: a series of books about how guitar amps work, how to modify them for better sound, how to build them and wire them for best note articulation and lowest noise, and tonnes more. Most boutique amp builders got their courage to go into business from TUT. The major builders buy them too, and have slowly been changing how they do things. See my website londonpower.com
Have fun
Ah yes, I remember now I saw your site and kinda choked at the "full up" cost of the complete series of books...
Would you be able to tell me which particular book(s) would cover silent switching? - I don't think I can justify the complete compendium.
Hi Guys
My posts in this thread give you the info needed to do quiet switching.
Otherwise, see the "Which TUT Book?" page linked from my home page.
Have fun
My posts in this thread give you the info needed to do quiet switching.
Otherwise, see the "Which TUT Book?" page linked from my home page.
Have fun
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