Connecting many microphones to iPad or iPhone

Your own risk.

It may be possible by connecting many Pleiades K117 cable preamplifiers together in parallel.

It may be done by connecting a splitter headphone mic adaptor to iPad. It connects to iPad and provides 2 inputs. Or if a cable that provides separate connection for headphones and mic is used then 1/8in stereo splitters may be used for connecting many Pleiades K117 cable low noise preamps.

This effectively connects to drains of the K117 JFETs together. Addition of signals should be possible as JFETs have a relative high output impedance. So the signals would be summed as is done using summing resistors.

This technique can be seen done on the Bouyer ST30 electron tube amplifier, 2 anodes joined together:

http://www.eserviceinfo.com/preview.php?fileid=63214&mode=direct&ext=jpg

If it works then more than 2 mics could be combined by continuously splitting with more splitter adaptors.

If it does not work then microphones themselves can be connected in parallel series combinations and the output connected to just one Pleiades K117 cable preamplifier.

These principles apply to any device that can power an electret condenser mic.

The Pleiades K117 can amplify moving coil and ribbon microphones with amazing quality, it is open source and more information can be found on euroelectron blogspot including how to connect to iPad.

It would be nice to have many microphones, each close to an instrument and record live in real time at top quality Girl from Ipanema, Jobim, Gilberto, Phil Ramonne way.

Live, many instruments direct to 1 track in real time with top sound quality, using only the memory for one wave channel.


Maximum signal to noise ratio.


Minimal signal path.