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  1. Martaine2005

    Connecting a LED directly to a 230v isolation transformer

    In an ideal world, 230V - 2V = 228V across the resistor. But we don’t live in an ideal world and 230V will certainly vary (quite a bit). In your schematic the current through the LED is 20mA so an absolute minimum of 5W resistor but larger is highly recommended as suggested above. Lowering the...
  2. Martaine2005

    laster and LED ligth for meter saw

    I don’t think you looked very hard!. You tell us. We have no idea what you have in front of you. It obviously works on 6V as you are using it. I would simply take a part a 240V to 5V USB adapter. BTW, I think you mean a mitre saw? Martin
  3. Martaine2005

    electronic following circuit

    I have seen a few of the ‘follow me’ robots over the years. Most are Arduino based with GPS and Bluetooth that either connect to a homing signal or smartphone held by operator. YouTube is probably the place to start looking. Search for ‘follow me’ module or suitcase or cooler. BUT these are in...
  4. Martaine2005

    position sensing

    @sparky12 this thread is 11 yrs old. Martin
  5. Martaine2005

    POT burning/candle-like smell

    What potentiometer is it? Resistance and wattage? Martin
  6. Martaine2005

    What is this called and where do I get it?

    I think it may be called a polarised crimp connector. They do make 8 way connectors too. You can buy the connector housings in many flavours and pin it to your liking. Edit: something like these? Or these? Martin
  7. Martaine2005

    Push-Pull Potentiometer Selection for Specific Electric Guitar Effects

    That will switch from centre common to left side of switch and centre common to right hand side of switch. The DPDT has two of these for two different circuits to be switched. For example, push will switch centre and left side while pull will switch centre and right side. But you can also wire...
  8. Martaine2005

    Push-Pull Potentiometer Selection for Specific Electric Guitar Effects

    It looks like a DPDT on a 500kΩ pot. You can measure your pots with your multimeter. Measure the two outside terminals for the Max resistance. Martin
  9. Martaine2005

    Push-Pull Potentiometer Selection for Specific Electric Guitar Effects

    It looks similar to this here.
  10. Martaine2005

    Fishing bite alarm

    To rule out RF interference, take it out of the area first. Secondly, are the transmitter and receiver paired?, or definitely supposed to work together?. It has been known to mix up units. You need to resize your pictures to 300kB. Use an online editor or software like paint. Martin
  11. Martaine2005

    Fishing bite alarm

    I will let you read rather than me type. Here is a good explanation. But these also need the magnet/s in the vicinity like the Reed switch. Martin
  12. Martaine2005

    Fishing bite alarm

    No, you haven’t. The moderator was just giving picture sizes that the forum won’t throw an error. Up to 300kB works well. Martin
  13. Martaine2005

    Fishing bite alarm

    If it has magnets that move up or down, I think it’s safe to say a Reed switch is in there. Or a magnetic hall sensor. Something like this? Martin
  14. Martaine2005

    telephone receiver

    your colours may vary. My old sceptre phone, all wires were white. Martin
  15. Martaine2005

    telephone receiver

    Open it as already suggested. Or tell us what you’re trying to do. Martin
  16. Martaine2005

    Pulsate 1.5v D cell battery

    Is this for pulse charging the cell? Martin
  17. Martaine2005

    PullUp Resistor

    This wiki will help you. Martin
  18. Martaine2005

    One more schematic clarification

    That symbol probably has something to do with IC internals. Changing to high or low current automatically for a certain load. For example, putting a system to sleep or detecting standby. Martin
  19. Martaine2005

    how to identify max forward current in an infrared LED with no spec sheet

    I would say 20mA max. 10-15mA would obviously prolong the life of the IR LED. Martin
  20. Martaine2005

    Clicking noise from cd player

    Perhaps the spindle platter magnets are better in other players or vice versa. Either way, the disc must be warped. You can try pouring hot water on the disc and then placing a flat weight on it for a few minutes. It might re-take its original shape. Must be very hot but not boiling water. This...
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