Re: [Sursound] External phantom battery source for TetraMic PPAc
> Most days I would agree with you: but there is always Murphy's Law to contend with, and the specific case of this states that a PP3-powered recording device will fail only when a unique event is to be recorded. Ha! In my limited experience, Murphy is MUCH more likely to strike at rechargeable batteries. 8>D You find, far too late, that you haven't charged them properly or they no longer retain charge properly. Battery tech is improving day by day but Alkalines are still near the top of the list for convenient reliable power. If you use rechargeables, I suggest you have a new alkaline PP3 or two in your spares kit with the correct connector. I've never had new Alkalines from the big makers, Duracell, Energiser, GP etc fail on me. I'd be wary of OEM batteries though .. especially supermarket own name brands. In Oz, the Jaycar Eclipse brand seems OK. DO NOT USE ZINC CARBON CELLS FOR ANYTHING. Alkalines ALWAYS work out cheaper regardless of application. BTW, the 10 hr life I mentioned is for an end voltage of 8V but PPAc will work fine to lower voltages. I mention 10 hrs as that should see most recording events & concerts with ample safety factor. It's cheap insurance to always use a new one. ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
[Sursound] Ambisonic Toolkit for Reaper - 1.0.0.b9
ATK for Reaper v.1.0.0.b9 is now available. Some key changes: - Binaural decoders at all sample rates - New encoders and decoders for bridging between FuMa and AmbiX (useful for VR authoring) And two changes that breaks backwards compatibility: - Azimuth is now positive in counter-clockwise direction - Quad decoder now has 4 channels out only More details can be found here: http://www.ambisonictoolkit.net/publications/2016/07/24/atk-reaper-1.0.0b9.html Cheers, Trond ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
Re: [Sursound] External phantom battery source for TetraMic PPAc
Excellent points - thank you. Chris Woolf On 24-Jul-16 12:54, Fons Adriaensen wrote: On Sun, Jul 24, 2016 at 10:49:47AM +0100, Chris wrote: But does that mean that the impedance converters of the capsules are running on the 9V supply? If so, does the max SPL suffer, as it does on most microphones running off reduced supplies? On P48 I'm guessing the Class A stages run from ~30V rails. Capsule sensitivity is 7 mV / Pa. At 135 dB SPL output will be close to 0 dBu, which should be OK for a 9V supply. Ciao, --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
Re: [Sursound] External phantom battery source for TetraMic PPAc
On Sun, Jul 24, 2016 at 10:49:47AM +0100, Chris wrote: > But does that mean that the impedance converters of the capsules are > running on the 9V supply? > > If so, does the max SPL suffer, as it does on most microphones > running off reduced supplies? On P48 I'm guessing the Class A stages > run from ~30V rails. Capsule sensitivity is 7 mV / Pa. At 135 dB SPL output will be close to 0 dBu, which should be OK for a 9V supply. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow) ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
Re: [Sursound] External phantom battery source for TetraMic PPAc
Useful comments, Richard. Thank you. But does that mean that the impedance converters of the capsules are running on the 9V supply? If so, does the max SPL suffer, as it does on most microphones running off reduced supplies? On P48 I'm guessing the Class A stages run from ~30V rails. Chris Woolf On 24-Jul-16 06:31, Richard Lee wrote: The Tetramic spec declares 3.5mA x 4 capsules (=15mA) @48V - that's 720mW But to power through the PPac it's 9-12V @<10mA - that's 90- 120mW - a big difference. The P48V current consumption is pessimistic. Powering directly bypasses the regulation required for P48V. You also avoid noisy P48V in some (many?) prosumer recorders though PPAc is pretty immune to this. It was designed with wall plug adaptors in mind but do check out the one you want to use. I use an alkaline PP3 rubber banded to the PPAc. Make sure you have the correct connector. For an important recording, use a new ALKALINE PP3. Probably 10 hrs life http://data.energizer.com/PDFs/522.pdf I regard batteries as consumables and the cost is trivial. I do stage sound and find it easier to use new batteries than to try & ensure 24 batteries for 12 radio mikes are all fully charged. A bag of PP3s costs less and will weigh less than chargers etc But really anything which will supply 9-12VDC will do. I've suggested to Len we sell a deluxe PP3 connector with O2-free Cu, insulated with the scrotums of Cooktown kangaroos, all hand carved from solid Unobtainium by Virgins .. shut up Lee ... just SHUT UP! ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
Re: [Sursound] External phantom battery source for TetraMic PPAc
and for anything really impportgant, have a backup recording system (or 2) running in parallel! It's the "belt, braces and piece of string" scenario. Every Blessing Tony On 23/07/2016 21:58, David Pickett wrote: At 07:31 24-07-16, Richard Lee wrote: > >For an important recording, use a new ALKALINE PP3. Probably 10 hrs life > >http://data.energizer.com/PDFs/522.pdf Most days I would agree with you: but there is always Murphy's Law to contend with, and the specific case of this states that a PP3-powered recording device will fail only when a unique event is to be recorded (c.f. the one that got away)! ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
