PAIA Phantom Power Preamp

[Jules Ryckebusch]

Doug, I designed it. The diodes should be about 5.6 volts to 12 volts. I
didn''t do a lot of stress analysis but If your mic signal is greater than 5.6
volts peak.... then you don't need a pre-amp! The 12 volt ones might not kick
in "fast" enough to catch a spike and save the opamp. BTW the kit uses the
venerable 5532 but OP-275's or OPA-2134's (digiskey) will work great too. Don't
have a scan of the PC board but you can bread board it on a Radio Shack PC
board. The key issue is separating the switching supply for the Phantom Power
supply from the audio circuitry.

Jules Ryckebusch


Doug Forbes wrote:

> Howdy
>
> Does anybody know the value of the back-to-back zeners in the PAIA PreAmp ?
> http://www.paia.com/phantsch.gif  Also what op amps are being used ? And if
> that weren't enough begging how about a picture of the PC board ?
>
> Any help would be appreciated ...
>
> Doug