Hi John, Thanks for you reply. The source is 220 vdc unregulated. No I didn't account for the 3 watts of power dissipation. Will increase resistor to 100k at 1/2 watt. That will be almost double the power dissipation. Again many thanks.is your 220V source safe? Is it DC?
Have you accounted for power dissipation in the dropping element? 150 V x 0.02 A is 3 Watts.
JR
I'm wrong again that only leave me with 1.7ma. Is there a more eloquent way to do this?Hi John, Thanks for you reply. The source is 220 vdc unregulated. No I didn't account for the 3 watts of power dissipation. Will increase resistor to 100k at 1/2 watt. That will be almost double the power dissipation. Again many thanks.
Where would I tie the negative terminal of the switching supply to.The obvious problem with switchers is that they are NOISY. Not necessarily 50/60 or even 100/120Hz but HF (50KHz plus AND possibly other artifacts.
Don't forget that if it is running a 'normal' phantom powered mic then pin 1 of an XLR (Normally chassis for safety) is grounded so your supply needs to be 'floating' or be very aware of what sharing the 'ground' will actually do.
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