====D4====
sign
{{:samples:d:d4_sign.jpg?100|}}

low f
{{:samples:d:d4_low_frequency_transducers.jpg?100|}}
med f
{{:samples:d:d4_mid_frequency_transducers.jpg?100|}}
high f
{{:samples:d:d4_high_frequency_transducers.jpg?100|}}

==Past:==

There is no know history of D4. 

==Current:==

The wire bounder does not want to wire bond to this sample. The pads do not appear to be metalic. 

==Future:==

Cleaned in Al etch and nanostrip, prepped again for ESEM. 

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Sample fabricated by Unknown\\
page updated 11 May 2015