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  1. T

    -DIY- Powering a 3 volt LED from a 4.5V supply

    Oops, makes sense why it hasn't worked then. I do have some 220 Ohm resistors too (he thinks lol). I could wire them in parallel like you suggested but I'm not sure how to do that. If you really don't mind sending them to me I'll pm you my address, thank you. Yes a digital multimeter. I...
  2. T

    -DIY- Powering a 3 volt LED from a 4.5V supply

    That is what I did first. I tested it without having the lights connected. Connecting the lights too I get 4.5 volts.
  3. T

    -DIY- Powering a 3 volt LED from a 4.5V supply

    1. Drawing attached. 2. Shown on drawing. 3. No they don't. 4. There are no colours on the resistor, it's one of these...
  4. T

    -DIY- Powering a 3 volt LED from a 4.5V supply

    I fitted a 100 Ohm resistor today. Voltage is still 4.5 when I test it. What am I doing wrong?
  5. T

    -DIY- Powering a 3 volt LED from a 4.5V supply

    Okay great! Will do, thanks!
  6. T

    -DIY- Powering a 3 volt LED from a 4.5V supply

    I got quite a few leads with it of various type so I can adapt them but handy to know if I want more. And thank you very much for the offer of resistors, I can get them through work luckily. The two LED's are in the head of this so other than knowing they are powered by 2x LR44 I know nothing...
  7. T

    -DIY- Powering a 3 volt LED from a 4.5V supply

    Okay great, thanks. I will power that LED from one output and use another output for the other two. For the two other LEDs, I don't have much information other than they are normally powered by 2 x LR44 batteries for which I work out as 3v total so one battery per LED, can you advise what...
  8. T

    -DIY- Powering a 3 volt LED from a 4.5V supply

    Thank you for that. 1597131115 1597131289 I honestly don't know what to do with this information. It's beyond me. This is the LED: https://uk.rs-online.com/web/p/products/8187562/ This is the power supply: http://www.soapstudio.com/index.php?route=product/product&path=477&product_id=645 It...
  9. T

    -DIY- Powering a 3 volt LED from a 4.5V supply

    Thanks for the input. That lines up with the calculator I used. It also said "Nearest higher rated resistor" as 82 Ohms. Is there a recommendation for having a higher rated one?
  10. T

    -DIY- Powering a 3 volt LED from a 4.5V supply

    Hello, I'm wanting to power 1 x 3v led from a 4.5v power supply and 2 x 1.5v leds from another 4.5v supply. Can anyone advise what resistor I have to install on each one. Using an online calculator I'm getting 82 Ohm on a calculator. is that correct? Is there anything else I need to take into...
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