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Topic: Arduino MEGA2560 USB parts identification (Read 758 times) previous topic - next topic

monkey123

I'm trying to essentially throw together my own Arduino MEGA2560.  I'm having some trouble identifying the parts connected to the USB port on the schematic and am hoping someone can help me out with what the parts are and where to get them, and/or appropriate substitutes.

On the MEGA2560 schematic I'm confused about parts: Z1, Z2, F1, L1

I believe Z1, Z2 are varistors, but I'm not sure which part/value to get.  Thanks for any help!

johnwasser

The PDF version of the schematic shows:

Z1 and Z2 are CG0603MLC-05E.  Google shows those to be Bourns ChipGuard MLC-series ESD protectors (varistor).

F1 is MF-MSMF050-5.  Google says that's a Bourns PTC Resettable Fuse.

L1 is a BLM21 which is a 2012 size surface mount inductor.  The schematic doesn't specify a value.  Perhaps the design files do.
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monkey123

Thanks for the input.  Would I be correct in assuming "22R RN2D" and "22R RN2A" are 22ohm resistors?

Nick Gammon

Without looking at the circuit, I'll stick my neck out and say that looks like 22 ohms in "resistor network '2D'".
Please post technical questions on the forum, not by personal message. Thanks!

More info:
http://www.gammon.com.au/electronics

johnwasser


Without looking at the circuit, I'll stick my neck out and say that looks like 22 ohms in "resistor network '2D'".


On the schematic it looks like there are five resistor networks:
RN1: Quad 10k (one is unused)
RN2: Quad 22 Ohms (two are unused)
RN3: Quad 1k (one is unused)
RN4: Quad 1k
RN5: Quad 10k (one is unused)
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