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  1. kellys_eye

    Simple button Repair (I hope)

    Still stuck on the wrong input perhaps? It's your bosses fault then - have some stern words with him......:cool:
  2. kellys_eye

    Circuit Protection For Inputs In Hostile Environment

    Would you consider using opto-couplers?
  3. kellys_eye

    Project Help

    I take it you are holding the 'remote' device to activate the phone ringer system yourself? I take it that the 'constant ring' is NOT correct and that a normal ring is required at all times? What form does the interference take? Buzz? Hum? Hiss? etc? Unfortunately the pictures aren't, as...
  4. kellys_eye

    Best solder to use

    I'm often tempted to stock up for the eventual occasion when even leaded solder is made 'illegal' for amateur use..... it can't be too far off although how they'd police it is anyones guess.
  5. kellys_eye

    Alarm Systems

    would seem to be quite apt......:cool: @ChosunOne - I always seem to forget that the forum is 'global' and that details such as you mentioned quite appropriately are sometimes misssed. Well put. :)
  6. kellys_eye

    Erasing PIC16C54C

    Most EPROMs are programmed and erased using the program voltage pin (/MCLR/Vpp) these days. Windowed EPROMs are still available but hardly ever used. Erasing would simply be writing all 1's or 0's to the relevant memory locations.
  7. kellys_eye

    Bit of quiz fun

    Here you go
  8. kellys_eye

    Transceiver Circuit

    The schematic doesn't show the 'common' terminal for the four change-over contacts so there really are 12 pins.
  9. kellys_eye

    Need to abort a 555 1-shot timer with same pulse that triggers it

    If you have any issues at all it will relate to the CR time constants of the integrators in the input and 'feedback' circuits. You should put a 'debounce' circuit on the input with an integral period shorter than the CR constant of the 'feedback' cirucit.
  10. kellys_eye

    Solder issue.

    Yes, 'consideration' as in recognising where the limitations of the veroboard copper strips may lie in respect to the potentially high currents, voltages and, in some circumstances, high frequencies your circuitry may consist of.
  11. kellys_eye

    Transceiver Circuit

    Are you asking us to design a printed circuit board for you? The 12 pins are all used.
  12. kellys_eye

    Rolson shake torch

    I'd say scam - much like the 'solar powered calculators' that are fitted with CR2032's (or similar) that last forever.....
  13. kellys_eye

    Alarm Systems

    It would depend on the situation and the orientation of the sensor. It doesn't 'not work' if installed upside down - as other posts show, the detection pattern is still capable of covering an area - however inadequately - regardless of its orientation so making a specific statement that...
  14. kellys_eye

    Circuit Protection For Inputs In Hostile Environment

    There are also three-terminal signal conditioning components often used on I/O line - they look like little 'blobs' and comprise a simple LC filter. Darn.... can't find a quick link to one.... typical :rolleyes:
  15. kellys_eye

    Finishing touches on motion alarm

    I considered reworking the schematic myself but lost the will to live. @Electric-T see how much difference it makes? Can you see how much easier it is to understand? I hope you can take this onboard - it will make you a much better experimenter if you can understand your own notes! :D
  16. kellys_eye

    What to do with old lead free solder?

    One notable exception is 'individual/amateur' use. Its 'mandatory' use is aimed at industry. Can't say I've noticed anything different about the world/health due to its introduction - probably on the basis of some eco-tard's demands based on some dubious research etc. I'd like to know the...
  17. kellys_eye

    DAB receiver

    Which DAB radio (make/model)? Which 5V mini supply? Which powered aerial? We're not psychic......
  18. kellys_eye

    Finishing touches on motion alarm

    Always amazes me how such a simple setup can be made to appear so utterly indecipherable when the schematic is drawn..... Schematics should be readable almost at a glance - you have to STUDY yours to even make head or tails of it :p Ever heard of 'circuit convention'? Draw it out again with...
  19. kellys_eye

    Need to abort a 555 1-shot timer with same pulse that triggers it

    In what way?
  20. kellys_eye

    How to wire up this ssr i have

    It's just a different way to make the designation - it could say 'anything' but as long as the data sheet gives you details of the signal it expects to see you will be able to interface to it.
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