Pages of my life
Next step in my current electronics project, after idea and schematics, is prototyping. Here is working prototype assembled on breadboard using lab equipment (like power supply etc). In top-left corner is zero-level cross detector, it converts any periodic signal with amplitude from 1 to 5V into square signal with 0 to 5V amplitude, pretty much digital one.
In bottom right corner Atmel’s ATTiny 2313 that measures frequency of this signal and shows it on display.
All of old. Nothing else ever. Ever tried. Ever failed. No matter. Try again. Fail again. Fail better.
Samuel Beckett
Hard drive on on of our client’s server went bad so we replaced it. Being curious, I teared it apart just see what’s inside. This is top view before operation. It needed torques not regular screwdriver.
17. What is the main difference between the 1.xx and 2.xx versions of Postfix?
See the RELEASE_NOTES files. It took me half a week to write them, and it would be a shame if people ignored them.
Postfix author, Wietse Venema.
For perfect happiness, remember two things:
(1) Be content with what you’ve got.
(2) Be sure you’ve got plenty.
Occasionally a field engineer will need to quickly measure the frequency of periodic signals. These signals could be in square, sinusoidal, or triangle form. Certainly there are labs with the proper devices that can measure these signals. However it is costly, not portable, and needs an AC power source. We will design and provide a portable, cheap, handheld device to overcome these problems. Our device will work on battery power and contain a built in function that will permit the device to shift into a power save mode when not in use. This will allow for battery life optimization. Continue reading “Frequency meter project”
The trouble with the rat-race is that even if you win, you’re still a rat.
— Lily Tomlin
Text By Charles J. Sykes
Printed in San Diego Union Tribune
September 19, 1996
Unfortunately, there are some things that children should be learning in school, but don’t. Not all of them have to do with academics. As a modest back-to-school offering, here are some basic rules that may not have found their way into the standard curriculum. Continue reading “Some rules kids won’t learn in school”
“I quite agree with you,” said the Duchess; “and the moral of that is — ‘Be what you would seem to be’ — or, if you’d like it put more simply — ‘Never imagine yourself not to be otherwise than what it might appear to others that what you were or might have been was not otherwise than what you had been would have appeared to them to be otherwise.’”
— Lewis Carrol, “Alice in Wonderland”