![]() ![]() This power is transmitted as DC electric power (direct current, as opposed to alternating current) to the microphone typically through the microphone cable. ![]() Specific types of microphones, mainly condenser mics, contain active circuitry that needs a power source to drive it, as opposed to passive circuitry which does not. Phantom Power is the name for a specific amount of voltage required by some microphones to function properly. We'll go in the same logical order that the questions tend to come up in conversation. This is the most complete but down-to-earth and easy to understand guide on the topic. ![]() Hopefully they, like you, have landed here. They look in the manual and for the first time see this mysterious phrase and are off on an investigation. Usually what happens is a newcomer gets their first microphone and preamplifier or audio interface and see that little button that says +48v on it. Now I can just send people here and save myself the trouble. Its not absolutly essential but would advantagous to empty phantom power from bloacking caps in the one switch.What is phantom power? How does it work? Why does it have that name? Which mics need it? Anybody who's been in this industry hears these questions a million times a year, including me, which is why I'm writing it up. Yes, sorry Klaus, I moved the goal posts as I was thinking this through !! I went from SPST to SPDT, Do you know if an array like this exists ? That way I can short blocking caps to GND via resistor in off position individually for each 8 channels. Yes I think I need an 8 channel logic controlled SPDT switch array that can handle 50v 10 - 20ma per channel. IsnĀ“t is pulldown resistor and a SPST sufficient? Therefore you need something like SPDT, but you talk of SPST. the UDN2981 presumabley leaves the input floating in off position. I need an 8 channel logic level controlled switch that flips between ( position ON ) supply +48 or ( position off ) short to GND via a resistor. I can see the PNP would have a very high switch state and need a NPN in front of it for 5v logic level. Yes, discrete solution would involve too much board space, I have 8 channels to switch. Or am i missing an obvious trick here with the darlington array ? Is there an 8 channel SPST switch that would be a good choice for something like this? would that work? Or maybe there are mini relays that are designed for this? I don't want to use relays, big heavy and unessasery for switching 48v 10ma of power on/off per channel at most? I'm asuming mosfet would lead to a similar problem. Unless i'm wrong here and ther is a way to use the darlington setup ? So switching ground on / off will not work ? I've looked at 8 channel darlington transistor arrays ( high & low side switching ) but can't see a way to use them as the phantom power point of injection on the input channels of the preamps is made of 6.8k resistor deviders accross the audio channel inputs & ultimatley share ground that the 48v & pre amp power supply uses. I have 5v logic on/off for each channel to use as switch control. I would like to switch 8 channels of phantom power supply +48v ( 100 ma approx ) for an 8 channel digitally controlled preamp i have made. ![]()
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