Some cool turned elements photos:
Operate Bench
Image by KLaFaille
Breadboarding a low pass filter making use of two triggers in a SN74HC14 to turn a low level, sine wave into 5V logic input.
On the scope is the 30mV 10kHz sine wave from the HP function generator overlaid on the 5V logic from the 74HC14. Purpose is to input this into a uC as a poor man’s frequency counter. Circuit design and style credit goes to PJRC.
Note all the crap on the bench, but the distinct lack of proper BNC cables for the HP. A single of these days..
How a ball personal computer mouse functions
Image by explainthatstuff
Here’s a closeup of the mechanism that makes it possible for an old-style ball mouse to detect your hand movements. There’s a light beam operating among the transparent square (an LED-style light emitter) and the black square (a photocell/light detector). As you move your hand, the mouse ball moves too. It pushes against a roller that turns the spoked wheel, breaking the light beam repeatedly. Counting the quantity of occasions the beam is broken provides a precise measurement of how far your hand has moved.
This photo is from our report on how computer mice function.
For a bit more context, see the photo of the exact same mouse taken from overhead.
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