Hi,
I've got a few beginner questions about what I should consider when building this mic preamp (this article gave me the idea to tackle this IC due to its great performance in low noise applications http://www.audiomasterclass.com/the-famous-5-preamp-everything-you-need-to-know).
I know how to solder and follow drawings but little else about how a circuit works, hence my probably dumb questions.
This preamp should possibly include a peak limiter (most sound sources would be very quiet but there could be some occasional sudden spikes):
The drawings are not mine, they come from a TI datasheet and from http://sound.whsites.net/project67.htm, I'd like to know:
1. Can I omit the 48V phantom power (since my input wouldn't probably need it)
2. Should I balance the output or only the input?
3. If my input mic is actually a piezo transducer which may be accidentally hit from time to time due to handling and movement, will the IN4148 diodes suffice to block harmful voltage spikes on both IC and output?
4. Since my output will be a portable recorder (or possibly more than one kind of portable recorder) and they have 2 kohm (one type) and 1.6 kohm (other type) impedance, could I get a proper impedance with just one circuit I would I have to build one for each, or preferably have to match impedance (datasheet states best results are at 200 ohm input impedance)?
5. How should I merge both so that I can just set the input, preamp and recorder and leave it recording without worrying about clipping?
6. Should I have to adjust the preamp output so that it doesn't yield too much voltage to such portable recorders?
7. Since the preamp IC supply range is 4.5/18 V, can I power it with 4 Li-ion batteries (3.7 V each, yielding 14.8 V) with the same parts shown in TI's drawing, or should I have to recalculate resistors and capacitors value due to the different voltage?
8. Am I missing something else obvious that my clear lack of know-how makes me easily miss?
Thank you
Allison
I've got a few beginner questions about what I should consider when building this mic preamp (this article gave me the idea to tackle this IC due to its great performance in low noise applications http://www.audiomasterclass.com/the-famous-5-preamp-everything-you-need-to-know).
I know how to solder and follow drawings but little else about how a circuit works, hence my probably dumb questions.
This preamp should possibly include a peak limiter (most sound sources would be very quiet but there could be some occasional sudden spikes):
The drawings are not mine, they come from a TI datasheet and from http://sound.whsites.net/project67.htm, I'd like to know:
1. Can I omit the 48V phantom power (since my input wouldn't probably need it)
2. Should I balance the output or only the input?
3. If my input mic is actually a piezo transducer which may be accidentally hit from time to time due to handling and movement, will the IN4148 diodes suffice to block harmful voltage spikes on both IC and output?
4. Since my output will be a portable recorder (or possibly more than one kind of portable recorder) and they have 2 kohm (one type) and 1.6 kohm (other type) impedance, could I get a proper impedance with just one circuit I would I have to build one for each, or preferably have to match impedance (datasheet states best results are at 200 ohm input impedance)?
5. How should I merge both so that I can just set the input, preamp and recorder and leave it recording without worrying about clipping?
6. Should I have to adjust the preamp output so that it doesn't yield too much voltage to such portable recorders?
7. Since the preamp IC supply range is 4.5/18 V, can I power it with 4 Li-ion batteries (3.7 V each, yielding 14.8 V) with the same parts shown in TI's drawing, or should I have to recalculate resistors and capacitors value due to the different voltage?
8. Am I missing something else obvious that my clear lack of know-how makes me easily miss?
Thank you
Allison