First steps in selecting a power supply (3.3V, 250mA)

Ledbulb84V

Trying to come up with a 3.3V power supply from AC Mains, I am still scratching my head. Options so far: 

  1. capacity dropper cirtuit 
  2. capacitive voltage divider
  3. transformer
  4. stabilised flyback mains AC/DC isolated converter (some time in the future)
  5. prototype solution - hacked USB wall charger
  6. pretty ready made (expensive) soulitons

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Keeping a close eye on parts, or: quick & dirty webcam macro mod

Macrotestimage

I got this camera for 10 Swiss Franks (~USD 10) earlier today. REALLY nice image, low light behaviour and very quick response time. 
I modded it with a cheap plastic lens for a GOOGLE CARDBOARD VR (If you have never tried that, buy on ebay and try it. really fun gimmick for 1-2 times, + you get two lenses :-) set I still had lying around (you get get just the lenses on EBAY). 

I just sticked the lens with double sided tape to the front and voila... 

Macro mod

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Twisted wires

Wiretwist

Usually I am fine with just having a mess while prototyping. When, however, it gets a little more serious, I like to twist my wires properly so they don't keep flapping the the breeze. 

Also, I like them to be a little rigid, so I add a pretty red coated steel wire to the other strains and use the corless drill to twist everything. 

The steel wire inhibits the the twisted wires from curling up and gives it some springy regidity. The ends I cut to the same length (GND I usually cut a little shorter on loose ends to prevent shorts) and add a shrink tube for the looks and to prevent everything from unravelling. looks neat, does it not?

Wiretwist
The  twisted wire

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Scavenging Canon Scanner / inkjet printer

Scavangedpartsprinter

I went dumpster diving the other day and brought home a (fully functional!) Canon Scanner / Printer.  I, of course, took it apart and took out all the parts I could - or thought I could - use: 

  •  photomicrosensor
    • 3 dual slot-type photomicrosensor (so you can see direction), two of them still mounted on the motors with the rotary encoder disk
    • 1 fork type photomicrosensor
    • 1 reflective photomicosensor
  • 2 rotary encoder disks with really fine divisions
  • 2 microswitches 
  • 1 photodetector
  • A few serial EEPROMs (one with 128Mbit / 32 MByte!) 
  • lots of screws and (nice) springs

Dumpster dive
The remains of the donor

 

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Low power AC mains zero crossing detector

Unsatisfied with reference designs I found throughout the internet, I gave "designing" an own, more efficient zero crossing detector myself.
The result: Efficient Zero Crossing Detector
Let me know what you think of it - click HERE

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Hello Visitor

I would usually not publish anything about myself on the free internet like this.

I have, however, developed interest in a few hobbies and I would like to share with you and maybe have your input.

I hope you find something interesting in here.

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