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How are surface roughness specimens created?

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4924890/ indicates that at least some methods used are: Chemical etching or oxidation and at the same time states that for 6, 20, 60, and 200 μm. CNC ...
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BJT Output Characteristics Question

Wow, what an odd way to drive a BJT. The B-E junction is much like a diode in that no significant current flows through the base until ~0.6V but by ~0.8V the device is destroyed. Because the B-E ...
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