panasonic electret mic amplification question

internecine · 22nd October 2007, 03:08 AM

got the mics, got a maudio transit, from what i read it says it supplies 5v of power for electret mics. got it plugged in and i dont get anything, am i doing somthing wrong? do these mics not work with the power supplied from the transit.

Iain McNeill · 22nd October 2007, 05:21 PM

The web site specs say it accepts "self=powered" mics and refers to the input as a line in.

Didn't see anything about an electret supply. You may need to add your own. Quite easy really: 2 x AA cells, a 2 to 5Kohm resistor and a 2.2uF cap. The mic will work with either polarity but the correct polarity will give lower distortion. Put the +ve of the cap to the mic-resistor connection, -ve to line in.

internecine · 22nd October 2007, 06:23 PM

thank you for your reply. its in the manual where it states it supplies power.

i think i have it working at the moment, but i might just build the simple power supply because the volume is quite low when recording.

Pjotr · 24th October 2007, 04:42 PM

Hmm, the M-Audio Transit supplies 2.5V mic power to an electret mic. by default. At least mine does

And any electret mic capsule works straight away with it.

But here is a schematic for a mic to power it externally. I made it for the IBF Akustik mic which also uses a Panasonic electret capsule and was calibrated at 2V and 2K2 load.

Cheers

Pjotr · 24th October 2007, 05:08 PM

Btw, this is what the manual says:

22nd October 2007, 03:08 AM	#1
internecine diyAudio Member Join Date: Mar 2007 Location: USA	panasonic electret mic amplification question got the mics, got a maudio transit, from what i read it says it supplies 5v of power for electret mics. got it plugged in and i dont get anything, am i doing somthing wrong? do these mics not work with the power supplied from the transit.

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22nd October 2007, 05:21 PM	#2
Iain McNeill diyAudio Moderator Join Date: Oct 2007 Location: Santa Cruz, California	The web site specs say it accepts "self=powered" mics and refers to the input as a line in. Didn't see anything about an electret supply. You may need to add your own. Quite easy really: 2 x AA cells, a 2 to 5Kohm resistor and a 2.2uF cap. The mic will work with either polarity but the correct polarity will give lower distortion. Put the +ve of the cap to the mic-resistor connection, -ve to line in.

22nd October 2007, 06:23 PM	#3
internecine diyAudio Member Join Date: Mar 2007 Location: USA	thank you for your reply. its in the manual where it states it supplies power. i think i have it working at the moment, but i might just build the simple power supply because the volume is quite low when recording.

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