Author Topic: 130 volt phantom power schematics for microphone  (Read 2006 times)

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Offline WiljanTopic starter

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130 volt phantom power schematics for microphone
« on: July 26, 2020, 12:09:29 pm »
Hi
A friend of mine got an old Bruel & Kjaer / DPA 4003 microphone which require 130 Volt phantom power.

So I look for a schematic to create the 130v phantom instead of normal 48v to get it operating.

Of course it would be possible with an oscillator and a Jacob ladder to make some high voltage but since it has to be use with a microphone level  I believe it quickly will make some noise so any suggestion are welcome..
 

Offline profdc9

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Re: 130 volt phantom power schematics for microphone
« Reply #1 on: July 26, 2020, 01:07:17 pm »
Since the current required is not likely very much, you can use one of the simple boost converters set up for Nixie tubes which generate 200 volts, but change the resistive divider to regulate to 130 volts.

https://www.electronics-lab.com/adjustable-hv-power-supply-stompbox/

It's not as efficient as designs using dedicated converter ICs but it can use very simple parts.  The voltage is widely adjustable by changing the R5, R6, R7 voltage divider.  I have used this design in several projects with success with voltages from 15 to 200 volts.



 

Offline WiljanTopic starter

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Re: 130 volt phantom power schematics for microphone
« Reply #2 on: July 26, 2020, 06:13:28 pm »
Since the current required is not likely very much, you can use one of the simple boost converters set up for Nixie tubes which generate 200 volts, but change the resistive divider to regulate to 130 volts.

https://www.electronics-lab.com/adjustable-hv-power-supply-stompbox/

It's not as efficient as designs using dedicated converter ICs but it can use very simple parts.  The voltage is widely adjustable by changing the R5, R6, R7 voltage divider.  I have used this design in several projects with success with voltages from 15 to 200 volts.

profdc9 the Nixie PSU is a good idea there are a lot of "ready" modules on ebay for low money and as I could see on one the use a switch freq about 500kHz which should hopefully not interfere with the microphone (make noise).

I will look into that idea for now
Thank you
 

Offline David Hess

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Re: 130 volt phantom power schematics for microphone
« Reply #3 on: July 27, 2020, 05:42:44 pm »
Of course it would be possible with an oscillator and a Jacob ladder to make some high voltage but since it has to be use with a microphone level  I believe it quickly will make some noise so any suggestion are welcome..

Charge pumps can be pretty low noise and especially so if driven with a sine wave.
 

Online Zero999

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Re: 130 volt phantom power schematics for microphone
« Reply #4 on: July 27, 2020, 06:02:16 pm »
Since the current required is not likely very much, you can use one of the simple boost converters set up for Nixie tubes which generate 200 volts, but change the resistive divider to regulate to 130 volts.

https://www.electronics-lab.com/adjustable-hv-power-supply-stompbox/

It's not as efficient as designs using dedicated converter ICs but it can use very simple parts.  The voltage is widely adjustable by changing the R5, R6, R7 voltage divider.  I have used this design in several projects with success with voltages from 15 to 200 volts.

profdc9 the Nixie PSU is a good idea there are a lot of "ready" modules on ebay for low money and as I could see on one the use a switch freq about 500kHz which should hopefully not interfere with the microphone (make noise).

I will look into that idea for now
Thank you
The amount of power required by a condenser microphone is so tiny, you could just leave it set to 200V and use a shunt regulator and filter to bring the voltage down to 130V.
 

Offline eliocor

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Re: 130 volt phantom power schematics for microphone
« Reply #5 on: July 27, 2020, 10:11:04 pm »
as always, I suggest the complete reading of LT AN 118 (Jim Williams):
https://www.analog.com/media/en/technical-documentation/application-notes/AN118fb.pdf

 

Offline WiljanTopic starter

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Re: 130 volt phantom power schematics for microphone
« Reply #6 on: July 28, 2020, 10:33:28 am »
Of course it would be possible with an oscillator and a Jacob ladder to make some high voltage but since it has to be use with a microphone level  I believe it quickly will make some noise so any suggestion are welcome..

Charge pumps can be pretty low noise and especially so if driven with a sine wave.

Yes I'm aware of that, thank you
 

Offline WiljanTopic starter

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Re: 130 volt phantom power schematics for microphone
« Reply #7 on: July 28, 2020, 10:34:34 am »
Since the current required is not likely very much, you can use one of the simple boost converters set up for Nixie tubes which generate 200 volts, but change the resistive divider to regulate to 130 volts.

https://www.electronics-lab.com/adjustable-hv-power-supply-stompbox/

It's not as efficient as designs using dedicated converter ICs but it can use very simple parts.  The voltage is widely adjustable by changing the R5, R6, R7 voltage divider.  I have used this design in several projects with success with voltages from 15 to 200 volts.

profdc9 the Nixie PSU is a good idea there are a lot of "ready" modules on ebay for low money and as I could see on one the use a switch freq about 500kHz which should hopefully not interfere with the microphone (make noise).

I will look into that idea for now
Thank you
The amount of power required by a condenser microphone is so tiny, you could just leave it set to 200V and use a shunt regulator and filter to bring the voltage down to 130V.

That's a good way to filter the noice away, thank you
 

Offline WiljanTopic starter

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Re: 130 volt phantom power schematics for microphone
« Reply #8 on: July 28, 2020, 10:35:38 am »
as always, I suggest the complete reading of LT AN 118 (Jim Williams):
https://www.analog.com/media/en/technical-documentation/application-notes/AN118fb.pdf
Thank you for the link, it's a very informative app note on the subject
 


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