AW: cross-point switches (was : PolyModular)

[Ullrich Peter]

	>Telling the truth, I explored that possibility a year ago or so, and I found that
	>AD manufactures a nice 200 MHz 16x16 buffered crosspoint switch (AD8116). 
	>That device can also be arranged in more complex matrix (48 x 48 crosspoint 
	>array, using nine AD8116, for instance). So the idea was to run every in/out 
	>signal (audio & CV) trough such a matrix, and to store / recall
	>patches through MIDI sysex.

	Also Mitel has such chips. We used the MT8816 matrix circuit as audio signal patchbay.

	>The only drawback is that the AD8116 comes only in 128 pins TQFP package !!!
	>Has any DIYer already tried to solder a 128 pin TQFP IC ? 

	I soldered 144 TQFP (pitch 0.5mm).
	Best solution for meas soldering all pins on one side together and then use
	a solder sucking wick to remove the solder tin between the pins.
	Soldering each pin by pin is nearly impossible!

	We sodered quite a lot of circuits this way (in the servicing department) and it works fine!

	Ciao
	Peter

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                   Hardware & Software Developer /  Electronic Musician
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