[sdiy] 1N4148 as replacements for Germaniumdiodes.

Colin f colin at colinfraser.com
Thu May 19 15:06:11 CEST 2016


> With a voltage drop of 3 x 0.7V, maybe they were concerned about getting
> too close to the high level threshold for the input pin ?

I just checked the datasheet for the upd650.
Minimum input voltage for a high level is 0.7 * Vcc
At 6V, that gives you 4.2V minimum, so those three diodes can't drop any
more than 1.8V.

Cheers,
Colin f






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