Electronics > Projects, Designs, and Technical Stuff
SMT mylar capacitors
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Alex Eisenhut:
Yeah I wasn't super clear on that, the serial port is driven by the level-shifted doubled-up inverters. There is no MAX232, none is needed as there already is -5V on the computer.
I don't see that Mylar caps are required here, I simply want to replace white caps with white caps. I guess it's just a bit of an irrelevant obsession of mine...
I was just surprised that there was such a thing as 1206 Mylar caps. I guess not...
Alex Eisenhut:

--- Quote from: Yansi on October 28, 2018, 02:43:47 pm ---It is a simple schmitt comparator with a frequency compensated voltage divider.

--- End quote ---

Yeah that's pretty much what I see when I look at the schematic. I didn't see the need for Mylar here.
Boy I hope my next question about Japanese logic families will be clearer...  :)
drussell:
Perhaps there was an earlier version of the circuit board that used different capacitors in those positions?  Maybe something like those little (often green) through-hole mylars that used to be in everything of that era?

Wasn't the model 100 basically all through-hole?  What did it use?  Maybe they basically copy & pasted that part of the circuitry and didn't update the BOM properly if the 102 was always SMT in those positions.
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