Guest Peter Brown Posted November 17, 2013 Share Posted November 17, 2013 I have a 19v laptop PSU and I use this for my CDU/Points but it's too much voltage for my LED lighting circuit. Would this converter do the job reducing the voltage to 12V for my lighting circuit ? Link to post Share on other sites More sharing options...
RMweb Gold Dagworth Posted November 17, 2013 RMweb Gold Share Posted November 17, 2013 Be cheaper (and more efficient) to buy the right power supply! Andi Link to post Share on other sites More sharing options...
RMweb Gold Dagworth Posted November 17, 2013 RMweb Gold Share Posted November 17, 2013 http://www.ebay.co.uk/itm/LED-Driver-Power-Supply-Transformer-240V-DC-12V-/290883688146?pt=UK_Home_Garden_Night_Lights_Fairy_Lights&hash=item43ba04d6d2 Link to post Share on other sites More sharing options...
Guest Peter Brown Posted November 18, 2013 Share Posted November 18, 2013 Thanks Andi, I have two power supplies 19V DC for the CDU/Points and 12V 2amp for my LED Lights. Just trying to combine the two into one supply. Link to post Share on other sites More sharing options...
RJS1977 Posted November 18, 2013 Share Posted November 18, 2013 MERG do power supply regulator kits - I think they only cost a few pence. Link to post Share on other sites More sharing options...
Crosland Posted November 18, 2013 Share Posted November 18, 2013 Connect the LEDs in series strings, as I said in the other thread, one resistor per string. ANdrew Link to post Share on other sites More sharing options...
shortliner Posted November 18, 2013 Share Posted November 18, 2013 an LM317, or similar, voltage regulator circuit? Link to post Share on other sites More sharing options...
66C Posted November 18, 2013 Share Posted November 18, 2013 I have a 19v laptop PSU and I use this for my CDU/Points but it's too much voltage for my LED lighting circuit. Would this converter do the job reducing the voltage to 12V for my lighting circuit ? Hi Peter Have a look at this website - it has a calculator for resistor values to use LEDs at different voltages: http://www.hobby-hour.com/electronics/ledcalc.php I have found that it is generally better to use a higher resistance than that calcuated to reduce the brightness of the LEDs a bit. Regards. Link to post Share on other sites More sharing options...
Guest Peter Brown Posted November 18, 2013 Share Posted November 18, 2013 Cheers this is a good site and I was able to calculate the resistors required for my parallel LEDs. Hi PeterHave a look at this website - it has a calculator for resistor values to use LEDs at different voltages:http://www.hobby-hour.com/electronics/ledcalc.phpI have found that it is generally better to use a higher resistance than that calcuated to reduce the brightness of the LEDs a bit.Regards. Link to post Share on other sites More sharing options...
Guest Peter Brown Posted November 18, 2013 Share Posted November 18, 2013 Be cheaper (and more efficient) to buy the right power supply! Andi Depends what you mean by cheaper, the above unit cost around £3.80 Link to post Share on other sites More sharing options...
Guest Peter Brown Posted November 18, 2013 Share Posted November 18, 2013 Connect the LEDs in series strings, as I said in the other thread, one resistor per string. ANdrew Thanks but my LEDs are already connected in parallel. Link to post Share on other sites More sharing options...
RMweb Gold Dagworth Posted November 18, 2013 RMweb Gold Share Posted November 18, 2013 Depends what you mean by cheaper, the above unit cost around £3.80 And the eBay power supply I linked to cost £3.69 with free postage... Andi Link to post Share on other sites More sharing options...
Guest Peter Brown Posted November 18, 2013 Share Posted November 18, 2013 And the eBay power supply I linked to cost £3.69 with free postage... Andi Andi Did look at that one thanks, wasn't sure because it was ac to dc rather than dc to dc. Link to post Share on other sites More sharing options...
Guest Peter Brown Posted November 18, 2013 Share Posted November 18, 2013 Now decided to stick with my existing power setup which is 19v to CDU/Seeps and 12V 1amp to my LED's. Link to post Share on other sites More sharing options...
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