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  1. kellys_eye

    to make a ultrasound speaker

    Here on the West Coast of Scotland we have plagues of 'midges' (noseeums to many) and use dedicated machinery based on scent production, CO2 emission (yay!), warmth and a vacuum device to suck the bleeders out of the air. Basically it's a mechanical cow...... Place is (in)famous for them...
  2. kellys_eye

    The new types of IOT

    Snowflakes? PS - love the signature! How many people 'get it?'
  3. kellys_eye

    How to wire up this ssr i have

    DC+ and DC- will be the supply voltage for the SSR board and connect to the same supply as is powering the light sequencer (it has to be a voltage anywhere between 3V and 32V, your sequencer uses 12V perhaps? That would be ok). The CH input of the SSR would connect to the CHx(+) output of the...
  4. kellys_eye

    MOSFET equivalent

    The OP might not get the reference :D but just to clarify and avoid disappointment/disaster, the 'lucky bag' comment is probably akin to "you'll be lucky to find one that works, never mind fits". Use appropriate caution and purchase proper parts for safety-critical circuits.
  5. kellys_eye

    Parallel help

    If the coils were of insulated wire then nothing will happen. If they were bare wire it would depend on where they touched. You will only modify the magnetic field around the coils by changing their proximity to each other. Whilst magnetic flux can add/subtract (depends on the field polarity)...
  6. kellys_eye

    Difficulty to find components

    3.7V x 2A = 7.4 watt-hours....... some way short of your desired goal of 216 watt-hours!!! The 3.7V would mean using a boost regulator to get the 5V and/or 12V required elsewhere in your design and the natural inefficiencies of such boost circuitry (90% at best) means more power consumption...
  7. kellys_eye

    The new types of IOT

    I heard they already made something like that .... called it 'grindr'.......
  8. kellys_eye

    MOSFET equivalent

    You'll be wasting your time in Maplin. Order direct from Farnell, Rapid Electronics, RS Components etc - Maplin are fast becoming the 'Radio Shack' of suppliers (older forum members will know what I mean by this reference lol)
  9. kellys_eye

    Light glow along a path and stairs following distance movement

    I doubt whether anyone on here has the code for it either. The datasheet for the sensor is quite explicit and contains enough information to develop code necessary to use it. That said, I did a Google using "ME007 software" and came up with this: http://playground.arduino.cc/Code/NewPing...
  10. kellys_eye

    Difficulty to find components

    18 ampere-hours (18Ahr) is the correct way to state it. There are a number of different battery technologies, from disposable batteries to lead-acid, nickel cadmium, lithium, etc etc and your choice is determined by a number of factors not least of which are size, weight, recharge time etc. 18...
  11. kellys_eye

    MOSFET equivalent

    That device is an N-channel MOSFET rated at 7A and 600V. http://pdf1.alldatasheet.com/datasheet-pdf/view/410924/JSMC/JCS8N60FB-O-F-N-B.html You can search distributors websites for MOSFETS using their filtering functions and setting the parameters to match (or exceed) the values I gave above...
  12. kellys_eye

    New member

    Blacksmithing eh? An interesting hobby in its own right. You couldn't chose two more extremes of the spectrum! Welcome.
  13. kellys_eye

    Help with increasing the power of a Philips hue bulb Frankenstein "hack"

    Even the linked-to article makes plenty of reference to the fact that you're playing with live AC mains voltages and that you really need to know what it is you're doing before poking around in there. I suppose, with such a device in my hands, I could come up with a solution - it's not...
  14. kellys_eye

    Gear VR Internal Connectors

    .... change the existing connector for one you CAN find.
  15. kellys_eye

    Alternative Energy Charge Bank

    2A will be fine.
  16. kellys_eye

    Alternative Energy Charge Bank

    Breakers protect the wiring, not the equipment. Overloading the output may instigate shutdown of the regulator (check to see if it has protection built in, many do) but if your regulator is rated at 3A and has no protection then fusing at 4A won't help.....
  17. kellys_eye

    Alternative Energy Charge Bank

    You're on the right track now! Change the breaker to a 2A (3A) version and make sure the wiring can handle at least the current the breaker is rated for.
  18. kellys_eye

    24v battery to 12vdc for stereo possible?

    Look for a buck (step down) converter module. Various sizes are available - chose one to suit the current consumption of your stereo. Note that a 100W stereo (if a TRUE 100W) would require peak currents in excess of 20A !!! and that your 2Ahr battery will last some 5 minutes at full volume.......
  19. kellys_eye

    Arduino Aggregates Eprom Prob

    There are many tutorials on using that module: http://tronixstuff.com/2014/12/01/tutorial-using-ds1307-and-ds3231-real-time-clock-modules-with-arduino/ https://learn.adafruit.com/ds1307-real-time-clock-breakout-board-kit/arduino-library are but two examples. It would be worthwhile working...
  20. kellys_eye

    Alternative Energy Charge Bank

    The 7805 requires a capacitor across the input to help prevent oscillation - see the datasheet. At full load (1.5A) the regulator will dissipate (or try to) ((12-5)*1.5) watts = 10.5 watts. That's a considerable, and unnecessary, loss of energy. Many buck converters operate at 90% efficiency...
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