Buck converter vs. linear voltage regulator

The buck converters are way more efficient than the old linear voltage regulators. Just make sure you get the good ones. (I have had 2 designs that didn't work well, one that's great. The ones with the LM2596 chip in it work the best. I add a good sized capacitor at the output to keep the lights from flicker. I run strings of LED"s 22 inches long and these guys can handle the current.

Jim Waterman

 

I am actually using them on AC powered standard gauge coaches, but add a bridge rectifier and another cap at the input to convert AC to DC before the voltage control circuit. Sounds complicated, but I can build  whole bunch in an hour or two, using the holes in the little PC board to solder in the extra components.

 

Jim Waterman

 

Jim Waterman posted:

I am actually using them on AC powered standard gauge coaches, but add a bridge rectifier and another cap at the input to convert AC to DC before the voltage control circuit. Sounds complicated, but I can build  whole bunch in an hour or two, using the holes in the little PC board to solder in the extra components.

 

Would you have pictures of the component connections to the complete converter?  I would like to replicate.  What size cap and bridge rectifier?  Thx

I have the Buck converter L2596 to power LED strip lights that work real good. No problems.

My question is will  incandescent light bulbs last longer powered by DC voltage?  I have changed a few RR lanterns and put in 12 volt Incandescent bulbs while using the L2596 converter.  Works real good and brings up the light slowly with the use of the transformer.  Any thoughts on this? 

Stay frosty my friends,

laz57

TCA 03-55991

John’s is an ac to dc linear supply? Linear is fine, I think, for leds...the power is low.

In the case of the wrong boards, usually China will offer some percentage refund and you keep the boards. If you keep refusing the offer, it gets better.

Chuck TCA LCCA ARRL BMWMOA

cjack posted:

John’s is an ac to dc linear supply? Linear is fine, I think, for leds...the power is low.

In the case of the wrong boards, usually China will offer some percentage refund and you keep the boards. If you keep refusing the offer, it gets better.

Latest offer is they'll gladly send replacements...if I close the case...I will close once they either provide a tracking no. or a refund. Tomorrow I'll call ebay and force a refund.

 

 

C. Jones

cjack posted:

I'm using these DC to DC switchers and they take a bridge rectifier on the input side very easily installed. The input has a 220uF/35vdc cap on it already. Works well...IMG_1879

Yeah - mine look like that too. I also add a minimum of 1000 uF after the bridge and before the lights (so a cap on each end of the board). Some of the boards have two sets of holes on each end, makes it a little easier to add the caps. That little blue thing is a multiturn pot, allows very accurate adjustment of the output voltage.

Jim Waterman

 

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Dave ZucalAlan Mancus


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