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  1. Martaine2005

    I Want to Create a Revolutionary Table Fan!

    What’s a revolutionary fan? Will it have fan blades? Battery powered or mains? Plastic or metal? Super duper circuitry to auto switch on? Speed settings? I’m afraid you’ll have to give us more details of your planned fan. Martin
  2. Martaine2005

    Help with an ESC schematic

    There are considerations to be aware of when paralleling MOSFETs. Have a read here. Martin
  3. Martaine2005

    Hello - 1st Time Posting - Need Advice

    @Harald Kapp it certainly does look like a SMD LED. The OP mentioned a button which threw me. :) Martin
  4. Martaine2005

    Hello - 1st Time Posting - Need Advice

    Looks like a tactile switch. Martin
  5. Martaine2005

    Help with an ESC schematic

    That is the main reason for having mosfets in parallel. Martin
  6. Martaine2005

    AC Power wiring to Light Bulb

    I didn’t look at the link because an AC bulb is/was either BC or ES. Excluding GU10s and the like. As far as which terminal is live, it absolutely does not matter. Now, from a house wiring perspective it would be wired with the centre bulb pin live and outer shroud neutral for ES bulbs. But BC...
  7. Martaine2005

    Are these capacitors interchangeable?

    That’s a definite yes from me too. Don’t forget that you can always increase the voltage and temp rating without adverse affects. Martin
  8. Martaine2005

    4.5 volt to 12volt

    Not only is my math terrible but I thought a 570Ω resistor was mentioned. I obviously chose a 560Ω to be the closest. I also assumed a 1.8V fV and 4.5V supply. Totalling 100mA for all 20 @ 5mA each. But I stand corrected. Martin
  9. Martaine2005

    4.5 volt to 12volt

    They run on 4.5V because the current is very low (560Ω) resistor and 5mA. Martin
  10. Martaine2005

    4.5 volt to 12volt

    The resistor can be placed in either leg/side. Your set is either in parallel or two in series then paralleled. Use a multimeter across the LEDs to get voltage and then in series with the set to get current. Then the resistor can be calculated. Martin
  11. Martaine2005

    4.5 volt to 12volt

    The CR2032 doesn’t supply much current at all, hence no resistor required. The 12V OTOH can. Series current limiting resistor will be required. It if worked on CR2032 but doesn’t now on 12V, you probably killed the LEDs. Martin
  12. Martaine2005

    AC Power wiring to Light Bulb

    It doesn’t matter which connection is used. But keeping with the ‘norm’, the outer screw section would be neutral and the single bottom connection would be live. As AC is alternating current, both terminals/connections will change/alternate. So, it really doesn’t matter. EDIT: I would like to...
  13. Martaine2005

    what is this ic

    Took you 8 months to think of a response? Martin
  14. Martaine2005

    Need help designing 3-20 led chasers (sequential lights)

    I see, still seems like it’s over engineered when placement of the LEDs and or only one CD4017 could achieve the same results. But I guess it has its uses. Martin
  15. Martaine2005

    Need help designing 3-20 led chasers (sequential lights)

    What’s the photocoupler for? I can’t see any point in having it. Martin
  16. Martaine2005

    Sansui B-2101 Calibration Woes

    Typing a reply is all too easy from an arm chair!. I’d make sure all the conductive glue is gone. Check under resistors and all components. I presume you checked the ESR on all the electros?. Martin
  17. Martaine2005

    Need help designing 3-20 led chasers (sequential lights)

    Hi, did you read post #4?. Martin
  18. Martaine2005

    Need help designing 3-20 led chasers (sequential lights)

    Just a thought, are these 20 rice LEDs on a string of copper? With 2 x AA or a coin cell battery? If so, the above posts won’t work unless you want each 20 LEDs to flash at the same time. ie, you can’t get a string of 20 to flash sequentially 1,2,3…etc. (Without rewiring them all). Martin
  19. Martaine2005

    Need help designing 3-20 led chasers (sequential lights)

    The circuits you’ve seen are probably a 555 and a 4017 IC?. The 10 LEDs are (probably) purely because the CD4017 has 10 outputs. However, these can be cascaded for more outputs. Alternatively, an Arduino micro controller and addressable LEDs can achieve your goal 100 times over. Can you link or...
  20. Martaine2005

    TL401 928 -> TL431

    Where does the ‘D’ shape fit in? Ah, a TO-92 package.. Martin
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