Phantom power for 1 or 2 condensor mics

[El Heisenberg]

Is there a good diy schem for this? Somethibg i could whip up with simple compenents and a transformer?

[scratch]

no experience in that dept. but here is something that might help ...

http://sound.westhost.com/project96.htm

[Minion]

At the least you need a 35 -40v AC Transformer , a Bridge rectifier , 4 Capacitors , a 48v Zener diode , and Two 6.8k and a 680r load resistor ....

Connect the Bridge rectifier to the transformer the usual way , put say a 470uF 63v Cap between + and -   , then put the 680r resistor in series with the positive Rail , then put the 48v zener diode between + and - with the stripe on the diode faceing + , then put a 100uF 63v Cap between + and - .... now take a 6.8k 1% resistor and put it in series with the positive Rail and put the other resistor in Paralell with it so that both resistors are connected to the + Rail , Now connect the other end of one of the 6.8k resistors to Pin 2 of the XLR and the other 6.8k to pin 3 of the XLR (the one you are connecting the mic into ) and now connect the PSU ground to pin 1 of the XLR ....

Now to wire the output XLR that goes to your preamp you Take a 47uF 63v cap and connect the positive of the cap to pin 2 of the Input XLR and connect the negitive of the Cap to Pin 2 of the Output XLR , now do the same thing with another 47uF cap to pin 3 of the input/output XLR , now connect pin 3 of the input XLR to pin 3 of the Output XLR ......

Now you have a basic regulated phantom power supply , for 2 Mics you will need 2 more 6.8k 1% resistors , 2 more 47uF caps and of cource two more input/output XLR"s .....


Good luck

[tempus]

Another option:

http://www.tangible-technology.com/power/Phantom_frying.html

[Cliff Schecht]

John Simonton had an interesting method:



Voltage multiplier circuit in the upper right builds up to about 48V (limited to 51V max by a Zener regulator) and filtered before being fed into the mic input. A larger filtering cap will keep noise down.

[Michael Allen]

Build the one from ESP in the first link. I've made a couple, they're excellent. I ended up leaving out the Zener diodes in the signal to preamp section since they added a lot of noise. Without them the unit is silent. Very easy to build as well. I've got some layouts I can post, that are made for some neutrik connectors

[El Heisenberg]

Ok cool, thanks. Ill add this to my "get started" list.