Hi Tim, I know it's 5 months since your post, but I've been getting into PZM recording and felt bad that no one had responded (I haven't been reading this...
The "pressure zone" or boundary layer positioning of microphones has many advantages. "a 6 dB gain of direct sound and only 3 dB gain of the diffuse sound....
Hey Scott, if you're reading, I'd be very appreciative of your input :-) That goes for everyone else as well :-) Here are the two versions of Mr. Helmke's...
It really depends on the characteristics of the internal FET of the capsule, or the external FET in the case of the Alice. There's another version somewhere...
Someone will have or he found the following thing: circuit TV RCA RAR 2180th IC 76931 - 7M or ULA7658R4E found LA76931-7c and 7L but they are not equal Alguien...
Thanks Scott :-) So it would be great if I actually understood a little about what these do. For instance, I know the panasonic and transsound caps use on the...
... use ... the ... Hello, The voltage to the capsule/FET is determined by the 12V zener. I would also like to know how to determine the values for the ...
Has anyone disassembled Studio Projects C4 mics? I took out the screw over the XLR, but don't know how to take it apart. Help welcome. Thanks, Richard...
The resistors around the FET determine the current through the FET, to some extent depending on the impedance of the FET. I've generally done my stuff based...
i am planning to try out using fets as current sources instead of these resistors. i remember building a crude version many years ago. there are some arguments...
Once again Scott, because I'm once again querying about your circuit, if you're reading, your input much valued :-) And again, everyone else's input valued as...
... I'm thinking about it. Been researching it a bit.. some questions to those who may know the answers: How does one best connect Linkwitz modded capsules in...
After removing the capsule you will see a threaded ring near the end of the mic body. There are two small slots in the top edge of this ring. Using an...
Thanks Robert. So assuming adequate shielding, what would be the ideal resistor value? Or is it that 1G is a kind of settled upon value because it's been found...
My last 2 microphone builds used 2 Gigohm metal film resistors. I noticed no difference in sonic characteristics between the 1 Gigohm builds and the 2 Gigohm...
... I believe you though I have no idea how that works! Does the 12V zener diode deliver ~12V? How would one adjust the voltage to the capsule, with a zener of...
Thanks so much, ZAP! I think I'll go with 2G just to save some money then :-) The only 1G+ resistors I've found are designated "thick film" as opposed to...
Metal film resistors are theoretically lower noise than thick film resistors. I have never been able to measure (or hear) any difference between them in a...
Ah.. found the answer to the swamping one, maybe worth the effort, maybe not. 6 dB S/N increase with 95 V applied to the case. Improving S/N ratio part 2: ...
A zener diode is basically a primitive voltage regulator - it's designed to leak when the voltage gets above a certain point. So no surprise that zeners come...
... Ya! That's the one! :) It's my understanding the Rode NT-1A uses a CMOS inverter charge pump to get a high polarizing voltage. My concern with charge pumps...
Thanks Scott! I'm getting pretty stoked to build some mics - I plan on doing some TSB-165 based ones too. Peace, Sanaka ... designed ... that ... before it...
Thanks again ZAP Standoffs seem like a good idea, though I'm still not visualizing how they're used - is it just a little insulated metal post so the ...
... The answer is; yes, but it depends. If the resistor is too small then the low frequency response will suffer. The LF cutoff is controlled by the RC time...
Look in the Photos section under ZAPNSPARK. The first photo shows the "flying lead" approach. The gate lead of the FET is bent out away from the board and FET...
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