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Author Topic: Espresso phantom power?  (Read 304 times)

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Offline dijon

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Espresso phantom power?
« on: March 16, 2017, 12:19:47 PM »
Hey all,

I've searched the site but nothing came up about this unit, The Espresso Phantom Power Supply ($50 for the kit, $70 pre-built):

http://zeppelindesignlabs.com/product/espresso-portable-phantom-power-supply/

In the video he talks about being able to engage an 'active unbalancing circuit' that allows the the output directly into smartphones or, for my purposes a Sony PCM-M10.

Anything about this that sends up red-flags wrt using it with good mics etc?

Offline ~Jon Stoppable

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Re: Espresso phantom power?
« Reply #1 on: March 17, 2017, 01:15:14 PM »
It seems to use TL071 as a buffer amp; this wouldn't be anyone's first choice for a first-stage microphone amplifier, but for the advertised application of feeding into a smartphone or guitar amp its relatively high noise probably wouldn't bother anyone.

You could substitute that opamp for something considerably quieter, but it also depends on the resistor values around the amp.  They didn't provide a schematic in the kit instructions so I'm not going to bother to figure that for them.

Also their comment about "motorboating" in the user manual probably means that the phantom supply isn't well filtered.  This can cause problems with some microphones.

 

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