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Additional Pictures 

 

The signatures of one transistor each of the 5-channel hybrid module (top, hFE = 160) and 4-channel hybrid module (center, hFE = 260) retrieved
from a Canon LE-85 calculator manufactured in October compared to a 2N3904 General Purpose NPN BJT (bottom, hFE = 180).


horizontal rule

If you have additions to the above article please email: joerg@datamath.org.

© Joerg Woerner, August 31, 2024. No reprints without written permission.