November 9, 2010
University of Montana
Psychology and human interaction, encephalography, direct broadcast satellite systems, hardware-level neural network design
News - According to Pete - Octob…
about 3 years ago
FYI, the frequency is 1/Ln(2)C1(R1+2*R2) unless you bypass R2 with a diode – this is really important if you’re trying to control PWM with a duty cycle of 50% or less.
(I’m sure you already know this and simply forgot to add either the diode or the second R2 value, but I still have a head-shaped dent in my desk from when I first tried to make a PWM circuit and didn’t know that the diode was necessary, and I wanted to save someone else the aggravation)
Also, I’ve seen a 555 charging a capacitor which was also connected to a second 555’s control pin – this created an oscillating frequency and a really wicked flame-like flicker effect in an LED. I think that one of the engineer’s mini notebooks has the circuit.
News - Made in Earth
about 4 years ago
Whether or not your components are imported, they’re yours now, and the combination of devices that makes up a finished board was assembled here in the States. So you’re exporting your own products, which you own, rather than acting as a port through which the country of origin routes its own items, and the simplest way to label them is as being American.
I would simply label your items as “Made in USA – for component origins visit sparkfun.com/importinfo”. That’s more than due disclosure, and helps your customers understand the global nature of electronics commerce.
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