Rockbox Technical Forums

Support and General Use => Recording => Topic started by: perik on October 04, 2006, 03:37:03 PM

Title: phantompower + Iriver power ???
Post by: perik on October 04, 2006, 03:37:03 PM
Hi!

I know this discussion been up before but my question is in a bit different matter.

I know that the Iriver H120 provides with around 3 v power. But what happens if I connect a battery box between the Iriver and a phantompowered mic. Will that then be 3v + 48v = 51v?

Can this harm my mic?

Thinking of buying this:

mic: MSH-1M
powersupply: MHI High-impedance adaptor & power supply (3v)

from this sait:
http://naiant.com/studiostore/mobilemicrophones.html

will this connected to the Iriver be around 6 volt and once again do I risk to harm the mic?

thanks for help

Perik
Title: Re: phantompower + Iriver power ???
Post by: mlind on October 05, 2006, 02:27:24 AM

I know that the Iriver H120 provides with around 3 v power. But what happens if I connect a battery box between the Iriver and a phantompowered mic. Will that then be 3v + 48v = 51v?

Can this harm my mic?


No
Title: Re: phantompower + Iriver power ???
Post by: perik on October 05, 2006, 04:13:13 AM
Well thanks for reply but can you please explain a bit more.

Quote
I know that the Iriver H120 provides with around 3 v power. But what happens if I connect a battery box between the Iriver and a phantompowered mic. Will that then be 3v + 48v = 51v?


is it not going to be like this? will the voltage still be the same? in that case, why???

/ Perik

Title: Re: phantompower + Iriver power ???
Post by: petur on October 05, 2006, 04:22:22 AM
battery boxes and phantom power should always filter DC on the signal going to the recorder. That also means that any DC supplied by the recorder is also filtered out.

So your mic will get whatever voltage the batterybox outputs.
Title: Re: phantompower + Iriver power ???
Post by: fizze on October 05, 2006, 09:21:50 AM
yes, I can only second that.
There shouldnt be any DC bias on the input/output from the iRiver.

on another note, I heard that someone fried his iRiver by conencting a 48V phantom line to the LINE-OUT.
So be careful ;-)
Title: Re: phantompower + Iriver power ???
Post by: toolmanwill on October 05, 2006, 10:10:01 AM

yes, I can only second that.
There shouldnt be any DC bias on the input/output from the iRiver.

on another note, I heard that someone fried his iRiver by conencting a 48V phantom line to the LINE-OUT.
So be careful ;-)


yes be very careful, always remember too, iriver uses mini headphone jacks which have a voltage limit of 10-12 v DC so anything over that has the possibility of frying your iriver.
Title: Re: phantompower + Iriver power ???
Post by: perik on October 05, 2006, 10:34:04 AM
Hi!

ok. thanks for your warnings. but do I really need to be afraid of burning my Iriver if im using a setup like this:

condenser mic -> Denecke Ps-2 (batterybox which supplies 48 v phantom) -> Denecke AD20 (AD converter/preamp) -> Iriver H120 (optical in)

the batterybox powers the mic and shouldnt go "backwards" towards the AD20 and finaly as well to the Iriver. Am I right???

Another setup Im going to use:(from this page: mic: http://naiant.com/)

mic: MSH-1M -> powersupply: MHI High-impedance adaptor & power supply (3v) -> Denecke AD20 -> Iriver H120 (optical in)

Third setup possibility:
mic: MSH-1M -> powersupply: MHI High-impedance adaptor & power supply (3v) -> Iriver H120 (line in)

Foruth setup possibility:
mic: MSH-1M -> (3v) -> Iriver H120 (line in and will let the Iriver H120 power the mic with its 3.7 v)

Fith setup possibility:
condenser mic -> Denecke Ps-2 (batterybox which supplies 48 v phantom) -> Iriver H120 (line in)

do I have to worry about frying my Iriver (or anything else) with any of these setups???

thanks for your help

/ Perik


Title: Re: phantompower + Iriver power ???
Post by: petur on October 05, 2006, 01:57:37 PM
you should be safe there. I think most/all battery boxes decouple their output, and pre-amps should certainly not be a problem.

Yes, there was this story about a guy frying his iriver with 48V, but that was because he plugged his cable into the wrong connector on a switchboard iirc.