I'm going to build my own low noise preamp as the prices for ready made stuff is astronomical ($300 would be 'cheap').
My plan is to build this low noise balanced pre, and power it with a 22v lipo split into two +/- 11v rails (the circuit can work down to 9v).
The lipo will also be directly powering the microphones (which work on P24), with a protection circuit to prevent the current from hitting the preamp (the 2nd circuit on this page: http://sound.westhost.com/project96.htm).
I have basically two questions.
1) will I need to connect the 'virtual ground' of a rail splitter (top one here: http://sound.westhost.com/project43.htm) to the 'gnd' pin?
2) the phantom power protection circuit is designed for 48v, so will I need to change the resistors to get it working with 22v?
I apologise if these questions appear really, uh, dumb... but that's probably because they are.
My plan is to build this low noise balanced pre, and power it with a 22v lipo split into two +/- 11v rails (the circuit can work down to 9v).
The lipo will also be directly powering the microphones (which work on P24), with a protection circuit to prevent the current from hitting the preamp (the 2nd circuit on this page: http://sound.westhost.com/project96.htm).
I have basically two questions.
1) will I need to connect the 'virtual ground' of a rail splitter (top one here: http://sound.westhost.com/project43.htm) to the 'gnd' pin?
2) the phantom power protection circuit is designed for 48v, so will I need to change the resistors to get it working with 22v?
I apologise if these questions appear really, uh, dumb... but that's probably because they are.
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