Hi all!
I've constructed a ribbon microphone a while back. Now I'm in the process of constructing an on board preamp for this microphone. Tube free amplifiers are unexplored waters for me and I have some questions. (I found some interesting threads covering this subject, but this is also my way of saying hello to all)
I have a rough idea of how to set up op-amp gain stages, but no clue at all of what op-amps to opt for. In the ribbon microphone the output impedance is ~75 Ohms. The output voltage*current is very low. I think I have to opt for op-amps with very low noise levels..? Well any suggestions on your favourite audio op-amp would be very appreciated.
At this stage I've only done some tinkering in LTspice, but get stuck on the op-amp modeling. I think I'll go with two non-inverting stages in series to get into the level of gain I think I'll need to sufficiently drive standard recording equipment. Lastly, how do I tap the phantom power into my gain stages?
I've constructed a ribbon microphone a while back. Now I'm in the process of constructing an on board preamp for this microphone. Tube free amplifiers are unexplored waters for me and I have some questions. (I found some interesting threads covering this subject, but this is also my way of saying hello to all)
I have a rough idea of how to set up op-amp gain stages, but no clue at all of what op-amps to opt for. In the ribbon microphone the output impedance is ~75 Ohms. The output voltage*current is very low. I think I have to opt for op-amps with very low noise levels..? Well any suggestions on your favourite audio op-amp would be very appreciated.
At this stage I've only done some tinkering in LTspice, but get stuck on the op-amp modeling. I think I'll go with two non-inverting stages in series to get into the level of gain I think I'll need to sufficiently drive standard recording equipment. Lastly, how do I tap the phantom power into my gain stages?
Phantom power is easy, just needs a few passive parts. Google phantom power circuit. You might want to use a discrete LTP low noise transistor pair as input instead of an opamp to reduce noise.
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