Here is the data sheet on the capsule:

https://ven.rcsreg.com/r2/mic_data_sheet.pdf

Near the bottom, there is a wiring diagram.
It looks like I'm supposed to give it 3 volts,
which is maybe what those 1/8" 'plugin power'
jacks provide?

I want to use this with a recorder that has
XLR inputs with 48V phantom power. Would I just
change the value of the resistor?

I found this:

https://potardesign.com/simple-p48-for-electret-mic-capsules/

What value of resistor would I choose?

Thanks!


Toby

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* Origin: rbb pygate - the fidonet nntp junction (2:221/10.0)

Also, how much do I need to worry about the quality of the capacitor?

This seems ridiculously expensive:

https://www.amazon.com/Dayton-Audio-DMPC-4-7-Polypropylene-Capacitor/dp/B0002KRDFS/ref=sr_1_2?adgrpid=187081286355&dib=eyJ2IjoiMSJ9.hoETuFQunCYgnldbfMC1zpwQ4N-z_ozqGy9hLiDE9vXKj8aN6XYuhVCa2OLG0HeVuGOIRthNQeljQ8Oc1SoMd4jxVSjToFTp8pQ7nhOtbVyibafT5vXeT8m8rbvDHBF6w9NOiAy5hktYQdqmz70s9V09VWEDQ2_atXs0PBrw7Sn1oQc-NtF40vPOpR7rZ87LabUlg1TKzLYqKS0UpsJEPgioZamYtQ_KPwE5InlUXe4.UTunNv1hirTk5tLbXDWrnaJS2tVUniO0MEmy2mVQOiM&dib_tag=se&hvadid=792769839083&hvdev=c&hvexpln=0&hvlocphy=1014369&hvnetw=g&hvocijid=2631405493695304492--&hvqmt=e&hvrand=2631405493695304492&hvtargid=kwd-370047365277&hydadcr=2766_13896059_2119318&keywords=dayton%2Baudio%2Bcapacitors&mcid=4d0997acd1893239bacbbe57fdc511d6&qid=1780339308&sr=8-2


Would this serve just as well?

https://www.amazon.com/Dayton-Audio-DMPC-4-7-Polypropylene-Capacitor/dp/B0002KRDFS/ref=sr_1_2?adgrpid=187081286355&dib=eyJ2IjoiMSJ9.hoETuFQunCYgnldbfMC1zpwQ4N-z_ozqGy9hLiDE9vXKj8aN6XYuhVCa2OLG0HeVuGOIRthNQeljQ8Oc1SoMd4jxVSjToFTp8pQ7nhOtbVyibafT5vXeT8m8rbvDHBF6w9NOiAy5hktYQdqmz70s9V09VWEDQ2_atXs0PBrw7Sn1oQc-NtF40vPOpR7rZ87LabUlg1TKzLYqKS0UpsJEPgioZamYtQ_KPwE5InlUXe4.UTunNv1hirTk5tLbXDWrnaJS2tVUniO0MEmy2mVQOiM&dib_tag=se&hvadid=792769839083&hvdev=c&hvexpln=0&hvlocphy=1014369&hvnetw=g&hvocijid=2631405493695304492--&hvqmt=e&hvrand=2631405493695304492&hvtargid=kwd-370047365277&hydadcr=2766_13896059_2119318&keywords=dayton%2Baudio%2Bcapacitors&mcid=4d0997acd1893239bacbbe57fdc511d6&qid=1780339308&sr=8-2


Thanks

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* Origin: rbb pygate - the fidonet nntp junction (2:221/10.0)

On 2/06/2026 6:45 am, Tobiah wrote:

Also, how much do I need to worry about the quality of the capacitor?

This seems ridiculously expensive:

It seems ridiculously expensive because it is.

Instead of a snake-oil 'audio grade' capacitor (which would not fit in
an XLR casing anyway) a quality electrolytic capacitor, or even a
tantalum electrolytic would be fine. There is no type of plastic film capacitor of that value that would fit.

FWIW chances are many of your favourite older recordings' audio has
already passed through many tantalums in a Dolby NR module !

--
geoff

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* Origin: rbb pygate - the fidonet nntp junction (2:221/10.0)

On 6/1/26 11:20, Tobiah wrote:

Here is the data sheet on the capsule:

ÿ https://ven.rcsreg.com/r2/mic_data_sheet.pdf

The data sheet calls for a 2.2k resistor,and lists 3volt
input. Won't I be putting in 48volts because of phantom power?
The 'simple p48' tutorials suggest 100kohm resister, but it seems
like I"d need more than 2.2k if I'm raising the voltage to 48v.


Toby

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* Origin: rbb pygate - the fidonet nntp junction (2:221/10.0)

In article <10vlgeb$2lhe8$1@dont-email.me>, Tobiah <toby@tobiah.org> wrote: >On 6/1/26 11:20, Tobiah wrote:

Here is the data sheet on the capsule:

ÿ https://ven.rcsreg.com/r2/mic_data_sheet.pdf

The data sheet calls for a 2.2k resistor,and lists 3volt
input. Won't I be putting in 48volts because of phantom power?
The 'simple p48' tutorials suggest 100kohm resister, but it seems
like I"d need more than 2.2k if I'm raising the voltage to 48v.

The following circuit is a common one. It only drives one leg, so no differential drive, and no transformer isolation, but it is cheap to
make and not horrible:

https://www.panix.com/~kludge/crown.jpg

If you have the room, use stacked mylar caps. If you don't, tantalums
will fit this into an XLR connector. Make sure you don't get them in backwards, though.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

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* Origin: rbb pygate - the fidonet nntp junction (2:221/10.0)

On 6/5/26 04:12, Scott Dorsey wrote:

In article <10vlgeb$2lhe8$1@dont-email.me>, Tobiah <toby@tobiah.org> wrote:

On 6/1/26 11:20, Tobiah wrote:

Here is the data sheet on the capsule:

ÿ https://ven.rcsreg.com/r2/mic_data_sheet.pdf

The data sheet calls for a 2.2k resistor,and lists 3volt
input. Won't I be putting in 48volts because of phantom power?
The 'simple p48' tutorials suggest 100kohm resister, but it seems
like I"d need more than 2.2k if I'm raising the voltage to 48v.

The following circuit is a common one. It only drives one leg, so no differential drive,

Do you mean it would not be a balanced connection?

and no transformer isolation


What advantages are there to this design over the "Simple P48"
circuit that uses 1 cap and 1 resistor?


Toby

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* Origin: rbb pygate - the fidonet nntp junction (2:221/10.0)

On 6/5/26 04:12, Scott Dorsey wrote:

In article <10vlgeb$2lhe8$1@dont-email.me>, Tobiah <toby@tobiah.org> wrote:

On 6/1/26 11:20, Tobiah wrote:

Here is the data sheet on the capsule:

ÿ https://ven.rcsreg.com/r2/mic_data_sheet.pdf

The data sheet calls for a 2.2k resistor,and lists 3volt
input. Won't I be putting in 48volts because of phantom power?
The 'simple p48' tutorials suggest 100kohm resister, but it seems
like I"d need more than 2.2k if I'm raising the voltage to 48v.

The following circuit is a common one.

https://www.panix.com/~kludge/crown.jpg

I can't make out the mark at the end of the resistor spec, after
22kOhm. Is it a max watt spec?


Toby

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* Origin: rbb pygate - the fidonet nntp junction (2:221/10.0)

I can't make out the mark at the end of the resistor spec, after
22kOhm.ÿ Is it a max watt spec?

I see it now. 1% tolerance.


Toby

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* Origin: rbb pygate - the fidonet nntp junction (2:221/10.0)

In article <10vufl2$14ols$1@dont-email.me>, Tobiah <toby@tobiah.org> wrote: >On 6/5/26 04:12, Scott Dorsey wrote:

In article <10vlgeb$2lhe8$1@dont-email.me>, Tobiah <toby@tobiah.org> wrote: >>> On 6/1/26 11:20, Tobiah wrote:

Here is the data sheet on the capsule:

ÿ https://ven.rcsreg.com/r2/mic_data_sheet.pdf

The data sheet calls for a 2.2k resistor,and lists 3volt
input. Won't I be putting in 48volts because of phantom power?
The 'simple p48' tutorials suggest 100kohm resister, but it seems
like I"d need more than 2.2k if I'm raising the voltage to 48v.

The following circuit is a common one. It only drives one leg, so no
differential drive,

Do you mean it would not be a balanced connection?

It's balanced because both legs have the same impedance, but only one side
is driven.

and no transformer isolation

What advantages are there to this design over the "Simple P48"
circuit that uses 1 cap and 1 resistor?

It will work reliably with phantom power and the output is actually
balanced.
--scott


--
"C'est un Nagra. C'est suisse, et tres, tres precis."

---
* Origin: rbb pygate - the fidonet nntp junction (2:221/10.0)

In article <10vufqq$14ols$2@dont-email.me>, Tobiah <toby@tobiah.org> wrote:

The following circuit is a common one.

https://www.panix.com/~kludge/crown.jpg

I can't make out the mark at the end of the resistor spec, after
22kOhm. Is it a max watt spec?

It is 33kohm, 1%. It's not worth using higher precision than that.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

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* Origin: rbb pygate - the fidonet nntp junction (2:221/10.0)