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10Instructables51,704Views28CommentsUK
You can also find me on iFixit.com and Twitter @pleriche. Volunteer with TheRestartProject.org and keen to share my knowledge and skills and do anything I can to encourage girls to follow STEM subjects.

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  • How to Surface Mount Solder Using Solder Paste

    Excellent Instructable - thank you NemesisC! But for only very occasional use the hot air solder station isn't easy to justify. I recently hand soldered a few SOIC-8 chips and a SOIC 20pin device to breakout boards. The key is to stick the boards to the bench with Blu-tac and rest your wrist on the bench to steady your hand, and use a sufficiently powerful magnifier, a 1mm iron bit and flux pen. Flushed with success I then threw caution to the winds and attempted 3 SSOP 8 pin devices, and succeeded! But it's quite tricky not to get solder bridges between the pads, though not too hard to clean them up with solder wick. I wrote it up at https://therestartproject.org/wiki/Surface_mount_soldering - take a look if you like.

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  • Automatic cat flap monitor with intrusion detection and dissuasion

    We started out with a passive magnetic one - no electronics, just a magnet on the collar that was supposed to release a catch. But it didn't seem to be sensitive enough to work reliably, especially when the magnet stuck to the cat's bell. I got a cheap 125KHz RFID reader and some matching fobs but with a range of only a couple of inches it didn't look like it was going to work. If I'd wound a bigger coil it might have. But catching the wrong cat by behavioural analysis, then giving him a nice little surprise and watching him pop out again like a cork out of a champagne bottle was much more fun!

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  • p_leriche commented on p_leriche's instructable The Small Hadron Collider5 months ago
    The Small Hadron Collider

    I'm afraid it has to be Neopixels, or compatible WS2812B modules. Are you quite sure you can't get them in time on eBay?

    If you find the Adafruit rings too expensive you can get compatible ones from the Far East for a very reasonable price, though I can't vouch for the quality. Search eBay for WS2812B Ring. You can get a 24 pixel one for under £5, which is an excellent size for something that will still impress your friends but at a budget price.If you were thinking of a completely different type of display, then if you're into app development it should be possible to make a smartphone app that did much the same, using the smartphone's gyro to measure the tilt, but you'll have to work out the physics of the particle interactions for yourself.

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  • How to Coil Extension Cords with the "Shepherd's Knot"

    I always use this method for the lawnmower chord after being shown it around 15 years ago by our church warden. As well as for parachutes, it's also the only way to stow the multiple bridle lines of a large kite, having drawn them together first.

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  • p_leriche commented on fashla's instructable PCB Circuit Wall6 months ago
    PCB Circuit Wall

    I'd be interested to know the type number of that valve. From your description it would seem to be a "magic-eye" tuning indicator commonly used in valve VHF/FM radios in the '60s - see http://www.r-type.org/articles/art-137.htmI had a DM70 wire-ended type which I used to play with in my teens (goodness knows what happened to it) and I remember the EM34 (with a plastic or bakelite 8-pin base) was commonly used but this seems to be a B9A or B7G (7 or 9 pin) all glass valve as far as I can see.

    I'd be interested to know the type number of that valve. From your description it would seem to be a "magic-eye" tuning indicator commonly used in valve VHF/FM radios in the '60s - see http://www.r-type.org/articles/art-137.htmI had a DM70 wire-ended type which I used to play with in my teens (goodness knows what happened to it) and I remember the EM34 (with a plastic or bakelite 8-pin base) was commonly used - this looks like what it is. You should be able to work out from that link how to drive it. Find a 6V wall cube for the filament, then you'll just need some means of generating 150-200V at just a few mA for the HT supply - a boost switch-mode circuit should do the trick. To avoid the need for a negative supply for the grid, connect the grid to ground and put a 47k resis...see more »I'd be interested to know the type number of that valve. From your description it would seem to be a "magic-eye" tuning indicator commonly used in valve VHF/FM radios in the '60s - see http://www.r-type.org/articles/art-137.htmI had a DM70 wire-ended type which I used to play with in my teens (goodness knows what happened to it) and I remember the EM34 (with a plastic or bakelite 8-pin base) was commonly used - this looks like what it is. You should be able to work out from that link how to drive it. Find a 6V wall cube for the filament, then you'll just need some means of generating 150-200V at just a few mA for the HT supply - a boost switch-mode circuit should do the trick. To avoid the need for a negative supply for the grid, connect the grid to ground and put a 47k resistor (or 100K pot) between the cathode (pin 8) and ground.

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  • p_leriche commented on p_leriche's instructable The Small Hadron Collider6 months ago
    The Small Hadron Collider

    I'm looking for the properties of the particles, the significance of the different colours and brightnesses and how many different ways they interact or die. The binary is there for you to download in Step 7 but not the source. You'll find it much easier to analyse if you actually build it, even if initially only with a 12 or 24 pixel ring, as the intensity of the LEDs inevitably over-expose the videos, washing out the colours.To give you a little help, here's a preview of the Musical Hadron Collider which I'm in the process of commissioning.https://twitter.com/pleriche/status/739581560479985664

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  • p_leriche commented on fashla's instructable PCB Circuit Wall6 months ago
    PCB Circuit Wall

    Love it that you've even got a valve in there - you should light that up too! If you look up the designation you'll probably find the filament takes 300mA at 6.3V - drive it from a 5V supplu and it won't glow quite so brightly but will last a lot longer before burning out.

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