benbiles
Member level 4
Hi,
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.
I have 5v logic on/off for each channel to use as switch control.
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.
So switching ground on / off will not work ?
unless i'm wrong here and ther is a way to use the darlington setup ?
I'm asuming mosfet would lead to a similar problem.
I don't want to use relays, big heavy and unessasery for switching 48v 10ma of power on/off per channel at most?
or maybe there are mini relays that are designed for this?
Is there an 8 channel SPST switch that would be a good choice for something like this? would that work?
Or am i missing an obvious trick here with the darlington array ?
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.
I have 5v logic on/off for each channel to use as switch control.
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.
So switching ground on / off will not work ?
unless i'm wrong here and ther is a way to use the darlington setup ?
I'm asuming mosfet would lead to a similar problem.
I don't want to use relays, big heavy and unessasery for switching 48v 10ma of power on/off per channel at most?
or maybe there are mini relays that are designed for this?
Is there an 8 channel SPST switch that would be a good choice for something like this? would that work?
Or am i missing an obvious trick here with the darlington array ?