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Dammit, I never could grasp the impedance thing in this kind of context (internal resistances of circuits). I still can't grasp what's actually happening with the signal flow, but your answers at least inform me that I can do what I was hoping; that is, to run phantom to multiple channels from...
"High impedance" refers to the input impedance of the mic pre (in comparison with that of the PSU)? And in saying "low impedance" of the PSU, you are looking into its output, so to speak (so I guess that would be output impedance of the PSU)? Sorry, but it's one of those 'I may be about to learn...
So those two matched balancing resistors used in phantom power end up doing the isolating (aside from their noise limiting function). I guess they must do, otherwise you are paralleling your microphones together...
I'm confused.
I've always assumed that phantom power feeds to mixer mic pres need to be isolated from each other, i.e., each strip has its own dedicated 48VDC supply. However, my Soundcraft 6000 desk PSU has just one global feed that supplies all 24 channels. How do they keep them isolated from...
Yes, certainly, fidelity is a requirement, since the mic pre/EQ sections are decent, and the reason I'm salvaging them before trashing the rest of the desk. With only 5 socketed ICs on each board, I was also considering playing with alternatives in the future. Plenty of documentation exists on...
Thanks very much for the details and useful replies, guys. I see the point about the diodes, and will give that implementation a go. Also came across a dual rail supply that was variable up to 20V, which looks like a viable option also.
Cheers again.
Robin.
Thanks for the reply!
I've seen a few 15 -0 - 15 supply schematics, but figured the reason for 17 volts was to eek out the last drop of headroom from the op-amps. I'm sure a 0.2V discrepancy isn't going to make any difference if I can arrive at 16.8V. That's reassuring.
I can't envisage how...
My first post on this forum.
I am breaking the mic pre's of a Soundcraft 6000 analog console into half-rack modules, enabling me to install, say, 4 channels in a 2U box for mobile recording.
Each module retains the Mic pre and EQ sections, and there is space for a DI (Line level) 1/4" jack at...
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