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Messages - bikenomad

1
Tools of the trade / Re: Cutting mylar stencils with a silohuette cameo
Regarding the cutter offset code that CND asked about:

The units are device units (which on the Silhouette are 0.05mm). You can see this in the initializer for instances of class graphtec at line 11 of pmonta's graphtec.py where he defines the instance variable "scale" as 200 units/cm (his code is using inches as the basic unit):
Code: [Select]
self.scale = 2.54*200
So the "FC18" code tells the cutter that the diameter of the cutting blade is 0.9mm . I have verified this on my Silhouette Portrait.

I don't know why this results in an offset of 0.3mm for CND, unless that is the difference between his cutter's blade offset and the Silhouette's.

Regarding cutting without a border, as pmonta said,
Quote
Also, cutting a border outline can now be disabled by specifying a border of 0,0.
2
Bus Pirate Development / Re: Hardware manufacturing update
[quote author="ian"]
1. Replaced 3x 2.2uF tantalum capacitors with 3x 1uF ceramic. This is moderately cheaper, uses smaller parts, and it uses less tantalum (a conflict mineral).
[/quote]

I think that ceramic output caps may be a bad choice for the MIC5205 family because of their low ESR.

According to the MIC5205 datasheet, tantalum output caps are required.

They say on the first page:

Quote
For low-dropout regulators that are stable with ceramic output capacitors, see the μCap MIC5245/6/7 family.

And, about output caps:

Quote
The output capacitor should have an ESR (effective series resistance) of about 5Ω or less and a resonant frequency above 1MHz. Ultra-low-ESR capacitors can cause a low amplitude oscillation on the output and/or underdamped transient response.

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