1. Phenomenonal breakdown and explanation of electronics…many thanks!

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2. Were are you getting the black and green conecters?

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3. Thanks

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4. Very interesting, I am looking for a board that can charge my 45 amp lithium iron battery for my Volkswagen camper house battery while driving using alternator power to supplement my 100 watt solar charger. The house battery Powers a small norcold refrigerator that draws between 2 and 2 1/2 amps at 13 volts with approximately 30% duty cycle. also phone and tablet charging. Preferably I'd like to charge to 13.7 Volts and taper off the amperage to 0A to increase the batter's cycle life. What would you recommend.
   Thanks for your help, Alexander

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5. Hi. I wld like to ask something but i dont know if u r interested in comments of ur videos but i ll give a try ; we see that there are XLSemi Buck chips on both boards whic is very obvious to see in Buck Conv. boards. If So then what Mosfet and Massive diode does in DP30v5a realy? Why need?

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6. Is it safe to power a smartphone from a converters like these?

   What kind of output ripple allowance or switching frequency is acceptable?

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7. I ordered the luidang model after watching your video..great help. Cost me 15 us$ including shipping

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8. So… the buck converter could be your microcontroller for the project?

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9. Hello Julian, can you tell me where and how it called those 2 powerplugs with the green connectors on it? i search that kind of connectors 🙂

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10. hey,
    may i have bst400 please? it's for a project where I'm working on, but my budget is low because after a few I mistakes i made there were some things broke and I had to replace it. can you do this please? I would appreciate it.

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11. Note the size of the main inductor ! One is much larger and uses much heavier gauge wire.

    What is the operating frequency of each ?

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12. Dear Julian

    Can I power such a dc/dc power supply from a transformer with a full bridge rectifier?
    Or should I use a better rectified power supply to power this device?

    I enjoy your videos!

    Kind regards

    Stephan

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13. Hi friend
    interesting , there is a story about this. let me tell me . now I use black PCB to represend DROK prodcut, using green PCB represend my product RD DP30V5A-L
    In fact DROK product was designed earlier than RD DP30V5A-L. black PCB was designed and produced by other factory. drok conpany ask them design this , along selling, there are many many problem for black PCB, so DROK company can't endure such so many problem. so DROK company ask me to design a new one to replace black PCB . so we refer the request drok gave me and RD DP30V5A-L was born. so now you know the difference between them
    you can go to DROK home page, you can find one module , it is same with RD DP30V5A-L , only difference is than that one has black PCB . this is the story about the two products.

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14. I purchased a Drok after watching one of your older videos. I think it is really really nice.

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15. hi julian, could you maybe do a video or videos on cheap&dodgy high amp 12v/230v power supplies?

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