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  1. nbw

    For Sale: Humour and Electronics

    Hi there, I have a site (www.ohmart.org) with galleries of cartoons and links to a simple store where people can buy their favourites on shirts, mugs, mousepads, electric toothpick dispensers (kidding)... I sell a couple of things a month. Not enough to keep me in drawing pens LOL. It would be...
  2. nbw

    For Sale: Humour and Electronics

    thank you! it's a bit of fun making them and it keeps me off the streets, as they say :)
  3. nbw

    Electronics Mortuary

    Nothing quite as spectacular as you guys. That said, I've blown pin4 right off a LM3886T amplifier (accidental) and also (accidentally) applied 35V to a 16V electrolytic... now I know what's inside them!! :D
  4. nbw

    For Sale: Humour and Electronics

    cheers guys! It's taking a bit of time to make posts everywhere, so I'm now focussing on posting new designs and cartoons to my blog, and then when I want to help out (where I can) with some electronics experience, I can pop by the forums. Great that folks enjoy reading them as much as I do...
  5. nbw

    Photos, other than electronics

    pretty handy work with the camera! Wouldn't get pix like that out of our cruddy, beaten-by-children digital camera :)
  6. nbw

    Timers -- notes for the less experienced (work in progress)

    A tip someone gave me ages ago was to send pin5 of the 555 to ground via a 0.1uF cap....
  7. nbw

    Seismology --- One of my other interests.....

    You guys would love living in Christchurch!!! Lots of seismic activity: check out the quake drums at geonet.org.nz
  8. nbw

    What did you do???

    I did Genetics, Zoology and Molecular Biology... also a Diploma in Business, one in Banking... then I had 2 kids and they taught me even more :) Barney
  9. nbw

    mulptiple output power supply

    Crumbs, that's a pretty serious supply. I'm beginning to think about making a -30 to +30V supply for the lab, um, shed - I'm going to use 2 x LM723 ICs. Do a Google on those - they might be a good start for you - they can be configured to produce regulated voltages both positive and negative.
  10. nbw

    sun tracker part list

    You could also use 2 x LM393 if you have a couple lying around? 2 in each IC.
  11. nbw

    LED Tail-lights

    That's ok. I've just finished building a tail light for my motorbike with LEDs, similar kind of principles - one bank of Cree 3W LEDs in series, so 5 x 1.92Vf, with a small resistor to limit the current. A little less chance of me getting rear-ended now! :)
  12. nbw

    LED Tail-lights

    You could probably get some Vero-like board with single coppered holes, cut out a ring to fit your light, and then solder the LEDs as a start. You'll want all the same sort to match brightness. At a nominal 12V, and a typical forward drop of say 1.8V per red LED, you'd use 6 in series to give...
  13. nbw

    What can i possible do with graphite powder.

    Graphite powder is really good at lubricating tracks on aluminium doors that get sticky over time. Really helps them to slide better. Silicone spray is good too, but you can actually puff graphite powder all the way into the track chutes.
  14. nbw

    For Sale: Humour and Electronics

    Hi there, I'm Barney from New Zealand - long time electronics enthusiast (mainly old school transistors and such, but slowly learning about BASIC and PICs). When I'm not testing LEDs and waving aside solder fumes, I also like to design cartoons with an electronics bias (ha ha). Some folks in the...
  15. nbw

    If I gifted you an iPad/Samsung Galaxy Tab...

    score on the tablet - a guy at work has one the same size as yours and he also uses it to watch TV shows on the train on the way into the office. Plus the obligatory pix of kids, pets, fishing trips etc
  16. nbw

    If I gifted you an iPad/Samsung Galaxy Tab...

    I wouldn't mind one for the shed, to read datasheet pdfs on, maybe play some mp3s. Could be useful to draw cartoons on, or surf the net in bed while my wife is snoring away.
  17. nbw

    Need help multiplying a frequency

    Yep, more detail would be good. Microcontrollers - even the BASIC embedded ones like PICAXEs - can easily count pulses of that order and are dead easy to use. Digital counters / dividers like 4040 and 4060 could help as well. Some of the CMOS variety will operate at up to a few MHz, beyond that...
  18. nbw

    Cheap pc fan controller

    Once you've mastered that... then think about a temperature sensor to adjust the fan speed automatically... Another day maybe ;)
  19. nbw

    Variable 0-15V dc supply

    Good advice - I follow the same when building amplifiers. Better to go one size up on the transformer so it's not running too warm or hot. I have a saying 'forty-nine is fine' - up to 49 deg C is ok for me, if it's running hotter than that at a normal load for the application, I start asking...
  20. nbw

    Copying of eprom to eprom

    :D Good one! So you're telling me you type something into this Google thing and it comes up with all kinds of suggestions / possibilities??? You know, that might catch on one day ;)
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