frying my soundcards?

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jw11432

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ok, so im trying to setup a simple recording, and i think my soundcards are being fried. im using a 48 volt power supply and then going right into the mic port on ym soundcard...my first soundcard inexplicably stopped working...had a spare, so i installed it, my sound was working again, and then shortly after i try to start recording, it dies. is the 48 volt straight into the mic port frying my cards or something??
 
If you are feeding 48 volts into a sound card the answer is yes that will fry them.

Why are you feeding 48 volts into a sound card anyway?

The 48 volt supply is for condenser mics, thats where it should be going.

Cheers

Alan.
 
jw11432 said:
ok, so im trying to setup a simple recording, and i think my soundcards are being fried. im using a 48 volt power supply and then going right into the mic port on ym soundcard...my first soundcard inexplicably stopped working...had a spare, so i installed it, my sound was working again, and then shortly after i try to start recording, it dies. is the 48 volt straight into the mic port frying my cards or something??
Click to expand...

rubber_room.jpg
 
This should be interesting- given the gender of the cables and ext. phantom, it would actually seem like you'd have to jump through some hoops just to get it backwards. :eek:
 
mixsit said:
This should be interesting- given the gender of the cables and ext. phantom, it would actually seem like you'd have to jump through some hoops just to get it backwards. :eek:
Click to expand...

This reminds me of a story that I heard about a guy that made 1/4 to 2 prong cables and plugged his PA speakers into a wall outlet. The scary part is that these people are allowed to vote and operate motor vehicles.
 
I read this and I still don't quite know what to say. My first reaction was to chastise the sound card vendor for not including blocking capacitors. My second reaction was to suggest hooking the phantom supply up to the USB port instead. :D :D :D
 
The very fact that you're trying to use a condenser mic on a soundcard with 40cents worth of chips (its gotta be an onboard soundcard if it has a mic port) shows that you are doing everything WRONG!!!!

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Still using a built-in soundcard?? Unfortunately, those are made with less than $1 worth of chips for beeps, boops and light gaming (not to mention cheapness for the manufacturer) and NOT quality music production.
#1 Rule of Recording: You MUST replace the built-in soundcard.
Here's a good guide and tested suggestions: http://www.tweakheadz.com/soundcards_for_the_home_studio.htm
 
jw11432 said:
ok, so im trying to setup a simple recording, and i think my soundcards are being fried. im using a 48 volt power supply and then going right into the mic port on ym soundcard...my first soundcard inexplicably stopped working...had a spare, so i installed it, my sound was working again, and then shortly after i try to start recording, it dies. is the 48 volt straight into the mic port frying my cards or something??
Click to expand...

I think we need to give the poster some credit - he is obviously just trying to record the power supply, thats all!

Maybe you should get a step down transformer, get the voltage down to about ~1V, then plug it in. That should record a nice 50 or 60Hz hum with any luck.
 
dgatwood said:
I read this and I still don't quite know what to say. My first reaction was to chastise the sound card vendor for not including blocking capacitors. My second reaction was to suggest hooking the phantom supply up to the USB port instead. :D :D :D
Click to expand...

They most likely did, but the initial pulse of phantom power is sufficient to toast many sensitive ICs. The question is, was the soundcard vendor too cheap to include clamping diodes? And the answer to that is probably yes.

The cables don't need to be backwards in the case of an external phantom supply, because the very same pulse could potentially pass the phantom supply's output capacitors (let's hope it has those, which should make the soundcard input capacitors redundant although still ineffective).
 
while you're at it, stick a piece of toast in the CD burner for breakfast.....:D
 
So I had to try it. (Inquiring dweebs want to know:D
This AudioTechnica CP8506 does indeed do a small quick bump at the out jacks on power up' -about 10 or 12 on the Fluke75- (but they're slow meters), then nothing.
 
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