davoux
Active member
What voltage should you see delivered to the mic after the 6.81K resistors. I know that many mics will are not fussy anything between 12 to 52V is fine. But, it seems some of the newer mics are fussy about voltage. The reason I ask is that most phantom power schematics show that you are to trim the voltage regulation stage to 48 to 52V.
I have just built a simple voltage doubler system and have the power/voltage regulator section set to 50V per the diagram. However, the next section is the "Mic input powering" which starts with a series 220 ohm resistor, then has a + to grd. 220uf cap and then a + to grd. LED with a 10K resistor. All of this before it goes to the + splitting 6.81K resistors. At the point just before the 6.81Ks, I now read 34V. Is this reasonable or do I need to trim the voltage up, or, take out that series 220 ohm resistor. Or, is this the attenuation expected if you start at 48V and it really means the mic expects the lower voltage?
I know its a pretty basic question, but, look at the signature below. At least the system works without sparks or anything and will trim solidly between 2 to 60V nice steady DC.
TNX, John
I have just built a simple voltage doubler system and have the power/voltage regulator section set to 50V per the diagram. However, the next section is the "Mic input powering" which starts with a series 220 ohm resistor, then has a + to grd. 220uf cap and then a + to grd. LED with a 10K resistor. All of this before it goes to the + splitting 6.81K resistors. At the point just before the 6.81Ks, I now read 34V. Is this reasonable or do I need to trim the voltage up, or, take out that series 220 ohm resistor. Or, is this the attenuation expected if you start at 48V and it really means the mic expects the lower voltage?
I know its a pretty basic question, but, look at the signature below. At least the system works without sparks or anything and will trim solidly between 2 to 60V nice steady DC.
TNX, John