« Reply #3 on: March 21, 2007, 10:58:07 PM »
Richard, I figured you would know
Do they do more than convert 48v to 9v DC? I'd guess that the transformers are used to match impedences?
I'm just looking to power some electrets (on cables terminated with mini-XLR connectors) with 48v phantom power from a V3 and/or DMIC-20. I'd like to build it all into an xlr connector. Is a zener diode with a 10k current limiting resistor too primative?
A zener diode or similar (transistor with resistor voltage divider) will work just fine. To power the mics. The reason for the driver transistor plus transformer is to provide a *low impedance* and *balanced* output.
You can provide a hack solution with all passive components, and that will be fine if you don't drive a cable (just plug right into a DMIC20 or similar). This is what the Naint or other people were doing with a few passive components and an electret.
I suggest visiting the Yahoo group "micbuilders" if you want to do this. Lots of electronics hackers over there...
Richard
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Mics: Sennheiser MKE2002 (dummy head), Studio Projects C4, AT825 (unmodded), AT822 franken mic (x2), AT853(hc,c,sc,o), Senn. MKE2, Senn MKE40, Shure MX183/5, CA Cards, homebrew Panasonic and Transsound capsules.
Pre/ADC: Presonus Firepod & Firebox, DMIC20(x2), UA5(poorly-modded, AD8620+AD8512opamps), VX440
Recorders: Edirol R4, R09, IBM X24 laptop, NJB3(x2), HiMD(x2), MD(1).
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