Nifty Posted March 27, 2006 Share Posted March 27, 2006 I should know the answer to this but brains taking a rest. Can I step up 12V DC to 24V DC and if so how? Cheers, Nifty. Keep off the straight and narrow 😬 Link to comment Share on other sites More sharing options...
susser Posted March 27, 2006 Share Posted March 27, 2006 12V into an invertor to produce AC at some frequency. Feed AC into a 1:2 transformer (2 secondary turns for each primary). Rectify the 24V AC. Depends how smooth you want the DC 24V, how you rig the rectifier. ie simple bridge rectifier gives a kind of DC that is AC but all one way kind of thing. Good enough for a light bulb type stuff. If you want to make it easy, you could stuff a 240V invertor on and power a 24Vdc power supply unit such as those available from Tandy. Arf arf. Edited by - susser on 27 Mar 2006 09:51:47 Link to comment Share on other sites More sharing options...
Chris W Posted March 27, 2006 Share Posted March 27, 2006 Nifty There are dedicated chips available to do this which utilise an inductor rather than a transformer and include the on-board oscillator etc. I recently built a 12vdc to 18vdc converter to drive a telescope, which works fabulously. The telescope vendor wanted around £120 for the same thing. Cost me about a tenner including the box. Very low component count too. Maplin sell the chip (the LM2577T @ £5.16 inc vat) see here The device can supply up to 3A at output voltages up to 60vdc @ ~80% efficiency Chris   2003 1.8K SV 140hp see it here Link to comment Share on other sites More sharing options...
Chris W Posted March 27, 2006 Share Posted March 27, 2006 Nifty I notice on the Maplin webpage for this device that it states the input voltage range is 35v to 40v. That is a printing error, the device will accept input voltages from 3.5v to 40v Chris 2003 1.8K SV 140hp see it here Link to comment Share on other sites More sharing options...
Chris W Posted March 27, 2006 Share Posted March 27, 2006 Nifty PPS: the data sheet for this device can be downloaded from here Chris 2003 1.8K SV 140hp see it here Link to comment Share on other sites More sharing options...
susser Posted March 27, 2006 Share Posted March 27, 2006 Cor ! The wonders of modern technology !. I bet thass not even got any baling twine in it. They'll be putting a man on the moon soon. Ohhh arrr boooy. Link to comment Share on other sites More sharing options...
Nifty Posted March 27, 2006 Author Share Posted March 27, 2006 Chris, Many thanks for your help *thumbup*   Paul, I might fit it into the Land Rover with baler twine *tongue* Keep off the straight and narrow 😬 Edited by - Nifty on 27 Mar 2006 21:12:05 Link to comment Share on other sites More sharing options...
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