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  1. kellys_eye

    Flashgun no longer triggers flash

    Nice detailed post Edd <thumbs up>
  2. kellys_eye

    fuel gauge ground

    Is the sender working correctly? Darn - beaten to it....
  3. kellys_eye

    Project suggestions

    I would think that more than 50% of your final exam mark (for the project) would be related to the actual CONCEPT and 50% related to the IMPLEMENTATION. I have no desire to give you 50% of your final mark from MY input - do it yourself.... like WE had to.
  4. kellys_eye

    Eliminate effect of motion on the gsr sensor

    It's not the 'motion' that changes the GSR, it is the flexing of the skin - usually by the underlying musclature. If the limb was motionless (still) and accelerated in any direction, there would be no change. If the limb moves by any input from the patient then you'd see a change.
  5. kellys_eye

    USB Pen drive circuit diagram

    I just 'Googled' it and clicked on 'images' and found dozens.....
  6. kellys_eye

    Current Consumption of the IC BQ24075.

    To repeat - again.... The IC has a standby current consumption as per the datasheet (quiescent current as @davenn shows above) but the power it consumes in operation will depend on the condition of the battery it is attached to. There is NO WAY to determine this as a 'fixed value' for power...
  7. kellys_eye

    Op Amp with a/c output

    If the sensor is a 'coil' pickup of a rotating magnetic slotted disk then you'll have an AC signal output. If the sensor is a hall effect device then it MUST have a supply voltage to one side of it ergo one of the wires will have a fixed DC voltage on it. The 13V (battery) you measured fits...
  8. kellys_eye

    Generator question

    If you have to use the boats engine to run the generator then fit an extra alternator/battery and a decent inverter instead. There are some quality inverters out there with very stable outputs and a wide range of power capabilities. The battery will allow you to use some AC supply 'off engine'...
  9. kellys_eye

    In need of lighting (power) guidance

    LEDs aren't 'voltage' devices but current devices and require current limiting components/circuits. Equally, LEDs of different colour have different requirements. If we knew of the specific devices you wanted to use we could advise directly but there are many online references to 'chosing the...
  10. kellys_eye

    Help in deciding method for de-modulating? a signal to extract one frequency!

    ...and you'll DEFINITELY be sailing the boat alone.......
  11. kellys_eye

    Op Amp with a/c output

    Do you have the schematic of where the other ends of the wires go i.e. the wiring to the ECU (or any device/circuitry that is in the 'line' between sensor and ECU)?
  12. kellys_eye

    how to make Regulated power supply of 0 - 48V 5Amp using 24-0-24 V 5Amp center tapped transformer?

    All of them! The LM317 has a maximum rated differential voltage (input-to-output) of 36V - and can only pass 1.5A etc etc. There are many schematics if you Google 50V variable PSU.
  13. kellys_eye

    Thermometer Circuit

    You want a window comparator circuit to do that.
  14. kellys_eye

    Help in deciding method for de-modulating? a signal to extract one frequency!

    Fairly 'tight' filters can be made using dedicated tone decoder IC's such as the NE567. Your problem would be 'interference' from anyone simply whistling! and taking control of your model boat..... bye bye boat. http://pdf1.alldatasheet.com/datasheet-pdf/view/17983/PHILIPS/NE567.html If...
  15. kellys_eye

    Identifying equivalent for surface mount diode from photo

    Change 1N4004 to UF4004 then :D
  16. kellys_eye

    Op Amp with a/c output

    If it was true AC then both wires would read the same voltage. A squarewave with a DC component will also read as AC on a meter. Measure between one wire and chassis - what do you read? Measure between the other wire and chassis - what do you read? Use your meter on the DC ranges.
  17. kellys_eye

    Op Amp with a/c output

    I asked for clarification of the voltage and signal in the original thread on this subject. The schematic provided (only part of, not a complete schematic) shows two terminals, one marked 'V' and one marked 'S'. My inference was that 'V' was the supply to the (presumably) hall effect sensor...
  18. kellys_eye

    Identifying equivalent for surface mount diode from photo

    The diode can be replaced with a standard 1N4004 and any axial resistor will replace the fixed values SMD device (check the wattage - can't make out what size package those resistors are but the equivalent may be 1/4 watt or 1/2 watt...)
  19. kellys_eye

    Digi pot for pwm board

    The device itself is designed specifically to generate the gate drive voltages for SMPS circuits in as much as it delivers the respective pulse width outputs that don't overlap i.e. dead time (essential to prevent short circuits) but can also be modified by a feedback signal for stabilisation...
  20. kellys_eye

    What does your workshop / workbench look like?

    No such thing as a 'poor' workbench - they all develop over time and we all started with the basics. My first workshop was a set of drawers that my late father rescued from an old haberdashers (you young 'uns look the word up!) It had 48 drawers, each about 8-inches wide and 2 feet deep by...
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