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Rockbox mail archiveSubject: RE: my facts on micsRE: my facts on mics
From: Henri DAVID <hdavid_at_mail.com>
Date: Mon, 21 Oct 2002 11:03:32 +0200 hello, I tried the Sony ECM 907 with the archos. you need a preamp. I made one using one of those http://www.velleman.be/ kits + two 9v batt. http://www.velleman.be/Product.asp?lan=1&id=8982 I put it in a plastic box with one on/off switch in in and out plugs. The quality is ok as long as you leave the amplifier level to 0 on the archos. (this integrated amp is way to loudy if you increase the gain !) you can check the quality of what I get there : http://www.cs.helsinki.fi/u/tkt_davi/photos/2002-04/13-labas/labas01-LQ.mp3 http://www.cs.helsinki.fi/u/tkt_davi/photos/2002-04/13-labas/labas02-LQ.mp3 http://www.cs.helsinki.fi/u/tkt_davi/photos/2002-04/13-labas/ (I reencoded them in lower quality, for internet purpose, but can still get an idea about the quality) don't pay attention to the saturation, that was my fault I set the level to and didn't reduced it ! (BTW Archos Firmware VU meter are quite precise as they showed me the clips !) Hope it helps henri > -----Original Message----- > From: owner-rockbox_at_cool.haxx.se [mailto:owner-rockbox_at_cool.haxx.se]On > Behalf Of Uwe Freese > Sent: Saturday, October 19, 2002 14:24 > To: jimg > Subject: my facts on mics (was: Microphone) > > > Hello jimg, > > jimg wrote on Saturday, October 19, 2002, 12:58:07 AM: > > j> You're mixing apples and oranges here. The battery for the microphone > j> provides -phantom power- to drive the condensor; It does not > "amplify" > j> the signal coming out of the microphone. This mic is a pro-level mic, > > I think this is also wrong. Three possibilities: > > - dynamic mic, this mic doesn't need power > - electret condenser: this capsule has a FET inside and needs power > (>1,5V). Mony mics of this type exist, and they usually have a battery > inside. This power is not for amplification! > - condenser: this type needs the phantom power (48 V). This also is not > for amplification. > > Amplification: > > - dynamic mic has a greater output volume > - both dynamic and condenser mics need an amplifier to connect them to > the AJB line in, but maybe different types > > "Mic boxes": > > - many of them only provide the battery power. No amplifier inside. But > sold for much money. :( > - What I want (for ajb) is a box that > - gives the power for an electret condensor capsule / mic > - amplifies > - needs only a battery (9V) > - I soldered this type with a simple operational amplifier > and this costs < 5 ? > - one can built better boxes with better amplifier ICs inside (see the > german magazine c't 20/02, page 228, ~ 100 ?) > - minidisco.com: I think they are very expensive and I don't think that > these battery boxes are worth the money > > Mic types: > > See http://arts.ucsc.edu/EMS/Music/tech_background/TE-20/teces_20.html > > I think the best for recording a concert would be a one-point stereo mic > with mid-side technique. And the Sony ECM 907 is the cheapest I've seen > (~ 100 ?). > > Bye, Uwe. > > Received on 2002-10-21 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |