08 January 2011

FT817 Interactive Frequency Reader: weights...

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I have assembled a circuit of the work-in-progress "Interactive Frequency Reader" and weighted it: about 90 grams without the CA...
05 January 2011

Macro for cameraphone from viewfinder lens

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I have come across an article on Hack a Day about building and adding a macro lens to a cameraphone at almost no cost. It requires a lens f...
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04 January 2011

What is inside a 35mm point&shoot camera

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A fter few days in the hands of my daughter, a point and shoot 35mm camera plastic has started to break apart... time to put it aside and st...
27 December 2010

LCD and contrast (HD44780)

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I want to issue a word of caution about the contrast pin wiring on HD44780 compatible liquid crystal displays. All my diagrams show the cont...
10 December 2010

Cellphone remote control, just an idea

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A very close family member has asked me how it would be possible to switch on (electric) heating in a remote location. Through a phone call...
29 November 2010

The Joule-Doh night light

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W hat do you get if you take a joule-thief and put it inside a play-doh can? A yellow "Joule-Doh" light! (or a "Play-Thief...
12 November 2010

TTL oscillator as NE602 external source

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T here are lazy moments in everyone 's life when you want to drive the NE602 LO input with a TTL - generated signal . I had a...
08 November 2010

FT817 external display, video instructions (it)

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T oday I think that there is no better way than a video to show a product's features, and to get some feedback about it. So I produced 5...