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Yes!!! I just did this with my piezo buffer for my hydrophones. You need Shottkey diodes. See this https://www.jlielectronics.com/content/Hydrophone%20Circuit%20Design%20Update.pdf Best

I hope this is OK to ask here as it isn't exclusively a mic question but a general electronic question that might be applicable to some mics. Consider a fet input with a high impedance, that is

It's so obvious with hindsight . . . Mea culpa, . . . ________________________________________________ NO WORRIES, old man. Just use your Daily MULLIGAN and all is instantly forgiven and forgotten

Jerry (and pmfalcman) is (are) of course right. By all means measure your P48V and 9V before doing the arithmetic.? Da P48V is specifically important as many so called Prosumer 'P48' devices may be

A more elaborate answer would take several pages of discussion, so "yes".

Jerry - so, I understand, your answer to my question is: "It doesn't matter" Right?

"Tolerance analysis" is the correct wording.

For a start, the "9V" in the equation is not cast in bronze. One may argue that 7V or 5V is better than 9V, if only because no FET is equal to another, and noise performance would dictate to go

Richard - thank you for the info and thinking how to make life easier for simple, electronically dumb individuals like me. But... (there's always a "but" - this is a rule of the Universe) - the 48V

Thank you for the further information, Richard. I surmise then that the short between source and gate shown in Fig 1 is internal to the capsule. I look forward to using this really simple

The *5 - 10V is between the terminals on the capsule* i ... NOT on the XLR The 'new' method obviates messing about with a zillion resistors or pots.

For my devices, the Zoom H6 Essential and PUI 5024, I constructed a Simple P48, and the chosen resistor value is 75K.

I had explored this issue before, but later gave up. I don't know how the perfect bias voltage of 9V for the PUI5024 microphone is generated. However, when connecting the PUI5024 to different devices,

Fig 1 in FETbias.doc is exactly applicable to PUI 5024 Yes.? The 2 x 6k8 is standard for 48V Phantom

Hi Richard, Can I even set up the easy test condition of Fig. 1 if my electret is two-lead, for instance, PUI AOM 5024? I then only have access to the drain and to the already internally connected

Pondering how to choose SimpleP48 resistors, it suddenly occurred to me that we can use the techniques in *FETbias.doc* so I've updated that in my Files/Ricardo directory. It's so obvious with

You can't use "voltage-divider calculation", because the FET in the capsule does not act as a resistor. It has a variable I/V characteristic. Actually, most FET's used in low-level electronics are

There's no "exactly" the resistance value to use. There is usually a range of resistor values within which the capsule performs acceptably well. And there's variation capsule-to-capsule. Yes, if

Jerry Lee Marcel wrote: As with any buitlt-in FET capsule, one has to experiment. I'm sure it is due to my ignorance that I'm puzzled: as soon as you know (from the specs.) that a capsule loves to

All these capsules indicate identical*test* conditions, 2V with a 2.2kohm resistor. It does not give any indication of what the resistor should be with a different voltage. As with any buitlt-in FET