[mcp6453[_2_]]

I have a one-time project for which I want to use a Sennheiser ME2 into an XLR
mic input. There are commercial adapters available, but they cost more than the
mic. Since I already have a suitable Lundahl transformer, the circuit seems simple:

Pick the phantom off of the center tap of the primary of the transformer, knock
the 48V phantom to 5V with a resistor and zener (zener bypassed with a 0.1 cap),
resulting 5V coupled to the hot side of the secondary through a second resistor
(4.7K?), a cap in series with the secondary winding to keep the 5V DC out, wired
into the XLR. Am I missing anything?

If anyone knows of a similar schematic with values, please post a link. Thanks.

[Scott Dorsey]

mcp6453 wrote:
I have a one-time project for which I want to use a Sennheiser ME2 into an XLR
mic input. There are commercial adapters available, but they cost more than the
mic. Since I already have a suitable Lundahl transformer, the circuit seems simple:

Pick the phantom off of the center tap of the primary of the transformer, knock
the 48V phantom to 5V with a resistor and zener (zener bypassed with a 0.1 cap),
resulting 5V coupled to the hot side of the secondary through a second resistor
(4.7K?), a cap in series with the secondary winding to keep the 5V DC out, wired
into the XLR. Am I missing anything?

You can, in fact, do it without a transformer at all!

If anyone knows of a similar schematic with values, please post a link. Thanks.

DIY: Build Your Own Miniature Omni Mike
Recording, Vol. 22, No. 5., February 2009
--scott

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

[mcp6453[_2_]]

On 3/19/2012 10:46 AM, Scott Dorsey wrote:
mcp6453 wrote:
I have a one-time project for which I want to use a Sennheiser ME2 into an XLR
mic input. There are commercial adapters available, but they cost more than the
mic. Since I already have a suitable Lundahl transformer, the circuit seems simple:

Pick the phantom off of the center tap of the primary of the transformer, knock
the 48V phantom to 5V with a resistor and zener (zener bypassed with a 0.1 cap),
resulting 5V coupled to the hot side of the secondary through a second resistor
(4.7K?), a cap in series with the secondary winding to keep the 5V DC out, wired
into the XLR. Am I missing anything?

You can, in fact, do it without a transformer at all!

If anyone knows of a similar schematic with values, please post a link. Thanks.

DIY: Build Your Own Miniature Omni Mike
Recording, Vol. 22, No. 5., February 2009
--scott

Unfortunately I'm not a subscriber. If I subscribe, do I get access to the back
issues on the website?

[Scott Dorsey]

mcp6453 wrote:

DIY: Build Your Own Miniature Omni Mike
Recording, Vol. 22, No. 5., February 2009

Unfortunately I'm not a subscriber. If I subscribe, do I get access to the back
issues on the website?

I don't think so, but you can ask. They might put it for free if you ask
nicely, like they have done with the Chinese mike mod article and a few
others.
--scott

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