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  1. kellys_eye

    Interfacing industrial signals to microcontroller ADC

    It could be as simple as a voltage divider (resistive) with zener clamping for overload to bring the signal into the range of the DAQ device but much depends on what accuracy you're looking for.
  2. kellys_eye

    RF Circuit Battery Efficiency

    A decent quality boost circuit will deliver the required 6V at up to 90-95% efficiency - certainly worth a go. Look up the relative battery capacities (Ahr) for comparison to longevity. Some of the more esoteric chemistry AA's are also very energy-dense but correspondingly expensive. Sticking...
  3. kellys_eye

    Op Amp

    Google 'impedance'. 'infinite input impedance' means the signal being input to the op-amp is not affected in any way therefore the op-amp can effectively have any impedance signal source - high or low. If you are not prepared to do SOME work yourself, we are not prepared to do ALL you work for...
  4. kellys_eye

    Advice before buying an Inverter

    What is the motor powering/driving? Sure it's not 50Hz? ('course it is!). If the inverter is rated at 300W continuous output it should be ok - it doesn't actually specify (makes me suspicious). For a full rated 300W output you would need a fuse of 30A and cables to match - none of this 'let's...
  5. kellys_eye

    Multi Video game connection

    1. List all the video specifications of the games machines 2. List the video inputs of your display device You aren't looking to make a 'splitter' - you are looking to make a 'switcher'
  6. kellys_eye

    Sencore LC53 leakage test acting up?

    Have you tried to RTFM? :D http://dedisol.unsads.com/~squalyl/kurteries/manuals/Other/SENCORE LC53 OPS.pdf They aren't 'new' capacitors by any means. Even New Old Stock (NOS) would be a bad idea given their age - as far as the electrolytics are concerned. If you want to maintain originality...
  7. kellys_eye

    Help with bridge rectifier

    Ignoring 10-11-12, do you get any other resistance readings and where are they? The pinout certainly doesn't match the schematic - or the transformer is defective.......
  8. kellys_eye

    Running 24v led lights through a dimmer. Help!

    I hope the white plastic 'lump' in line with the cable is an AC-DC converter..... show us some details. If it's just a switch then you've blown the guts out of the dimmer!
  9. kellys_eye

    RF Circuit Battery Efficiency

    Use C or D-cells instead. If battery size is an issue then some more exotic chemistry versions of the AA might do it??
  10. kellys_eye

    Simpson 260 Series 5 Multimeter Repair

    If the meter won't work on the volts range (where it doesn't require batteries) it is possible that the meter itself is defective (damaged deflection coil) which is common in older devices such as yours. It is sometimes possible to have the meter repaired but it is a skilled and expensive task.
  11. kellys_eye

    Op Amp

    Infinite input impedance implies zero input current and zero input current implies zero effect on the input signal.
  12. kellys_eye

    Op Amp

    An 'ideal' op-amp will have infinite input impedance. Research op-amp parameters in respect to the mathematics of calculating their operation/performance.
  13. kellys_eye

    Help with bridge rectifier

    Discard any reading made using 'just one probe'. You can only make correct readings when both probes are connected. Is the transformer disconnected from all other sources other than the AC mains input? The readings you are getting do not correspond to the diagram shown in your original post...
  14. kellys_eye

    Where can I find "radio button" components?

    These? http://www.ebay.co.uk/itm/AC-250V-10A-5-Rows-Interlock-Push-Button-Knob-Piano-Key-Switch-3-Pcs-/191681851854?epid=1949189152&hash=item2ca120f1ce:g:V68AAOSwxu5ZNucL
  15. kellys_eye

    LCD Display (Basic)

    ....errr.. that method basically uses switches to set the code for each character (including the codes necessary for setting the cursor position etc) and it would take AGES to program even a simple text entry! It illustrates the process I suppose but it's not a method that can be easily...
  16. kellys_eye

    How to minimize acoustic mike<loudspeaker feedback?

    Audio feedback suppression is usually achieved by frequency-shifting the mic input - I have a number of construction articles that describe the process and offer a solution in hardware. Here's the schematic of one solution - lots of op-amps but a very basic circuit overall.
  17. kellys_eye

    Sencore LC53 leakage test acting up?

    Blimey! I'd be replacing that electrolytic no matter what it reads!
  18. kellys_eye

    Unspecified capacitor

    Voltage rating should equal or exceed the stated value to be suitable to install. If you get one of around 330μF and 450V it will likely just 'drop in' and work. Modern capacitors tend to be smaller than earlier versions although rated just as highly so fitting an 'identical' replacement isn't...
  19. kellys_eye

    LCD Display (Basic)

    Other than working through a typical PIC/Arduino 'basics' course (one that encompasses using LCD displays for output) then what you are asking is a bit beyond the limitations of this forum in the sense that it would take page after page of 'help' to work through it. I have a book called 'PIC...
  20. kellys_eye

    Potmeter "a" logo identification

    Body size and pcb fittings is relatively easy: check out this one I found on eBay although you might have to cut/file the shaft to length...
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