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Recent content by ChrisPDuck

  1. C

    Maplin Clock flicker

    That bridge is actually a reflection off some left over flux on the board, The flicker its self is a very regular flicker that looks like the PWM has been offset somehow, I can replicate it by changing the time to some point where the clock is supposed to be dimmed. Recreating the circuit...
  2. C

    Maplin Clock flicker

    It probably is cheap chinese crap tbh, but with staff discount, and it being on clearance, i didn't pay more than £5 for it :P I'll see if i can draw up the schematic, might be a challenge though! i was hoping someone would say something like, "with PWM its always component X that fails" oh...
  3. C

    Maplin Clock flicker

    OK, i've had this clock a while, ( it has a LED matrix display) and it has a feature that between the hours of 9pm and 6am it dims the display. Instead of just dimming the display, it has started to cause it to flicker ( noticeably) i'm guessing its due to the PWM being messed up somehow...
  4. C

    555 timer trouble

    thanks, the IC made me smile, i've worked with 555's alot, just not in the past few years, and seems i assumed my memory was better than it is, oops!:D
  5. C

    555 timer trouble

    thank you so much, i have realised where my mistake was, i was numbering the pins wrong, i had mistakenly gone 1( at the dot) down to 4, then started from the top for pin 5 instead on continuing anticlockwise. Thank you soooo much, now i'm happy :)
  6. C

    555 timer trouble

    ok i'm really at a loss now, i have tried replacing the 555 as well which is the last thing i hadn't tried and it still doesn't work :( does anyone have any ideas?
  7. C

    555 timer trouble

    i am using a 5.6pf cap on pin 5 as it is the only one i have around that small. Replacing C1 with a 100µF cap makes the cap charge faster ( according to multimeter, but it still won't trigger. I have treble checked the breadboard and even completely removed the circuit and started again a...
  8. C

    555 timer trouble

    I've not done this in a while an hence don't have any circuit diagram drawing programs on this machine but i can talk through how i have it connected ( on the 555) 1) 0v 2)+ on capacitor and one side of R2 and Pin 6 3)To LED 4) +v 5) ground via 5.6pf Cap 6)pin 2 7)between R1 and R2...
  9. C

    555 timer trouble

    Ok i am Making a simple 555 timer circuit on a breadboard using the astable circuit diagram. R1 is 1Kohm R2 is 10kohm C is 470 microfarad According to my maths this should give me an on time of about 3~ seconds and then an off time of about the same. BUT, for some reason the LED will...
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