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  1. kellys_eye

    electrolux/vernitron 12v dc re-igniter

    Not a number or numbering scheme I've come across so it could be an in-house designation. If you 'assume' both devices are identical then you'll need to remove the 'good' device to check the orientation of the leads (collector-base-emitter) as fitting a generic replacement is relatively easy...
  2. kellys_eye

    Reversing Motor Direction With Relays

    Which X10 control module are you using and what signal is it outputting to 'drive' the motor?
  3. kellys_eye

    Reversing Motor Direction With Relays

    Looks like a 12V relay to me - the contacts are rated at 10A for 24V throughput. It also spec's a 4mA drive signal which is easily provided by an Arduino port. Two such boards will reverse a motor. Vcc and GND are required to power the control electronics. IN is the control signal. Having...
  4. kellys_eye

    I'm trying to create a energy grid monitoring system using Arduino

    Detecting the presence or absence of an ac supply is as simple as monitoring the ac side (or even dc side) of the power pack used to run the Arduino/shield - a current limiting resistor and rectifier on the secondary of the PSU (assuming a wall wart kind of supply here). If you want 'live'...
  5. kellys_eye

    electrolux/vernitron 12v dc re-igniter

    Possibly - but no guarantee. Can we see a wider look at the whole thing and a view of the rear of the board?
  6. kellys_eye

    audio output transformer specs meaning?

    You could put the headphone is SERIES to match the 600 ohm requirement. But what is the 'power' of the 600Ω signal source - possibly noted in dBm. Most 600Ω signal sources require some form of amplification in order to drive loads.
  7. kellys_eye

    electrolux/vernitron 12v dc re-igniter

    You will have to pick the plastic off the case to reveal any markings. They're not easily seen in the first place and the plastic conformal coating hasn't helped.
  8. kellys_eye

    I'm trying to create a energy grid monitoring system using Arduino

    No point in re-inventing the wheel. There are domestic metering units available with built-in GSM systems that report directly back to the central control. It's a range of 'Smart Meters' that are being installed across many countries across the world. Equally there are domestic 'socket'...
  9. kellys_eye

    audio output transformer specs meaning?

    What precisely IS the 600Ω source? It sounds like a low level audio source rather than something with the 'power' to drive a speaker (even via a transformer). Similarly, what's the amplifier system? Is it valve based or is it simply a system designed to drive speakers via a 100V line?
  10. kellys_eye

    electrolux/vernitron 12v dc re-igniter

    Is it blown? Or is it just a 'blob' of the coating that board looks to have been waved over?
  11. kellys_eye

    LED getting hot

    Why step down from 13.2V to 12V? The circuit should operate on both voltages with only a very slight difference in LED forward current. But at the same time, there are only a few types of regulator that can work with such a small difference between in/out voltages - which version are you...
  12. kellys_eye

    Building an electronic foil surf board

    I'd check the thrust requirement first - seems awful low for what you intend to do. Then it's a case of compromise! Motor power versus run time versus weight versus recharge time etc etc. It's almost impossible to decide for you - though modern high power-density batteries (LiPo for example)...
  13. kellys_eye

    Issue in running BLDC motor with microcontroller

    The ULN2003 is your limiting factor. Try replacing them with discrete MOSFETS with low 'on' resistance.
  14. kellys_eye

    HP8753ES

    .. some nasty ringing on the supply lines - have you checked the decoupling capacitors?
  15. kellys_eye

    Issue in running BLDC motor with microcontroller

    Post the schematic of the circuit you are using to drive the motor - the microprocessor version.
  16. kellys_eye

    Issue in running BLDC motor with microcontroller

    Can you post a schematic of the arrangement you're trying to use?
  17. kellys_eye

    Introduction

    Hi Clive - I'm 'new' here myself (ok, signed up a LONG time ago but only recently started to contribute) and we're of the same age - duffers basically :D. You have some interesting paths to your hobby - I look forward to seeing your contributions. Dave
  18. kellys_eye

    Surface Mount Part Identification - TC

    ...as above. Tants are usually used 'generically' for their compact size - except in those situations where tant capabilities are 'required' (10 times lower ESR than equivalent electrolytics) but for the DC side of a power supply (pre-chopper etc) you'll get away with practically anything that...
  19. kellys_eye

    Identifying connector (power?)

    Knowing DELL it will be an in-house product and rarer than hen's teeth. The only reasonable source for one would be a redundant cabinet the blade came from.
  20. kellys_eye

    Reading from 4 identical sensors using a Raspberry Pi...

    Not 'exactly' what I had in mind but a compromise I suppose! If all you wish to do is select the IC2 lines then use tri-state bi-directional buffer devices like the 74LS 245. Check out its data sheet and come back if there are any parts of it you don't understand. There are also dedicated I2C...
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