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Andrew Hull
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Andrew Hull

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As promised, more pictures of the dumpster "bitza" franken-scope ... actually if you look to the left, you can see I managed to build two 'scopes from the bits I found. One binocular, one monocular.
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Andrew Hull

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You don't need to understand it all.. but the series is worth watching in my opinion. 
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The real market for these things is presumably, and unremarkably, China, where they  use them by the million to assemble all of those cheap goods we are so keen to consume. Its cheap for two reasons.. build quality, and numbers being produced.

One other thought, if your local electonics supermarket marketing spin doctor was trying to punt it, they would make a big play of all of the recyled components in it, and add $20 to the price. Some of those crusty caps and "recycled" semis look like they came from junked VGA monitors and the like.
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.. loved that... more please....
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PWM DOESN'T Change the brightness by changing the frequency. It changes the mark space ratio. Hence pulse WIDTH modulation. Go to the bottom of the class.
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WHA2 433 MHz PIR PCB.
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Andrew Hull

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I just converted this old GS microscope to LED, which involved removing the old transformer and burnt out wire wound potentiometer, and replacing it with a $2 LED dimer board. I'm quite pleased with the results.

Everything looks like it is original, except for the white 12V pigtail going to the wall wart (just visible on the right of the base in the clutter).

 I took the opportunity to clean and service the optics and re-align the eye pieces while I had it all apart, and in my opinion it now works better than ever.

I'm using a car tail-light filament bulb in this picture, still waiting for the LED bulbs to arrive. They should be even brighter,  although I find the LED "white" spectrum somewhat odd, very cold and blue.

More pictures to follow (if I remember to upload them) of the new lamp dimmer, the old 1.5K wire-wound potentiometer, which varied the input voltage to the transformer, and was thus attached to the neutral side of the mains input... all well and good till someone wires the plug up back to front, whereupon the only thing between you and toastsville is a black bakelite knob. I might even throw in some shaky images shot through the eyepiece of nettle sting barbs or some such.
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Pretty amazing results. That Orion AutoTracker looks like a very cool toy. Keep it up... you've inspired me to break out the CHDK and try some more sunsets.
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Andrew Hull

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I just tried to play this on a bamboo flute, and was not impressed with my efforts, so I went looking for someone who could play... all I can say is .. beautiful.... it had the hairs on the back of my neck standing up.. you really make that violin sing..
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Arduino Nano - listening for 433MHz PIRs from a B&Q Freidland alarm. The PIRS were in my junk box, the only additional parts needed were a 433MHz receiver module and a bit of wire to form an antenna. Grab the code from here... https://bitbucket.org/ya_433MHz/ya_433mhz_lib

Andrew Hull

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Obviously you don't have to believe this, but if you don't then you will need to explain the reason why it might be wrong...

http://www.businessforscotland.co.uk/revealed-the-accounting-trick-that-hides-scotlands-wealth/#comments

...as  a scientist and believer in mathematics rather than politicians, I'm only interested in logical, mathematically sound, and well reasoned arguments of course, but feel free to rant incoherently if you cant think of anything that meets the criteria of logical and mathematically sound (I will of course feel equally free to ignore you).
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Have him in circles
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Kyle Gordon's profile photo
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