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In Reply to: Re: Thanks for your concern, but . . . posted by Ray Moth on May 9, 2007 at 00:52:56:
Sorry about the misinterpretation but I've never seen a 100R used in series with the source. As to its purpose I'm sure it's as you suggest but unless it's being used in a low current application I think it would be detrimental to sound.
> > The time constant I had in mind was a 2.2Meg resistor, from the top of the zener (or VR tube, if you prefer) stack to the gate stopper, with a 2uF cap from the gate stopper to ground. Since the MOSFET has such a high gate impedance, a very high value of resistance can be used if required. This would cause the gate voltage to rise slowly, say about 10 seconds from 0v to the reference voltage. < <The time constant is OK and even lower will do but IME the high value R can affect the HF response if a good quality cap is not used.
Naz
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Follow Ups
- Re: Thanks for your concern, but . . . - Naz 05/9/0706:41:47 05/9/07 (2)
- Perhaps I meant the drain! - Ray Moth 14:43:44 05/9/07 (1)
- That's what I thought ... - Naz 15:56:59 05/9/07 (0)
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