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DC Converter Gather, Please Check Below:
DC Buck Converter
DC Boost Converter
JO 753
June 7, 2016 at 4:50 amPost count: 0Hello JO 753,
Thank you for writing in.
Could you please tell us your order ID or the link of the product?
It is better that you can tell us more details of how you operate the product, such us the input voltage/current, the wiring, the working environment?
If you can, we sincerely hope that you can send us some images or video to let us check the problem details.
With your help, we can find a solution more quickly.
Best regardsJO 753
June 8, 2016 at 5:59 pmPost count: 0Its your 2203 unit.
https://smile.amazon.com/DROK-Waterproof-Converter-Adjustable-Transformer/dp/B00C0KL1OM/ref=pd_bxgy_23_img_2?ie=UTF8&refRID=HJEJAR44S06ZVN95CPD4There wuz no ‘operating environment’. I connected it to a 12v car battery and connected the output leadz to a voltmeter to test it. It read 11.23v and the turning the adjusting screw didnt chanje it.
Jeremy Stambaugh
August 4, 2016 at 11:44 amPost count: 0I bought the
DROK® DC-DC 6~35V 1.0~35V Boost Buck Converter Adjustable Constant Output Voltage Step-Up Step-down Regulator to power 12V appliances from a 7.2V NIHM D cell battery pack.
The Amazon site says it is rated for 7A input and 5A output. However I can only power a 12V 10W light from this (just under 1A output and 1.4A input). The converter stops workign when I try to power anything more powerful. So are the current ratings mucvh too high?
Hello Jeremy,
Thank you for writing in.
Since there are many products are with similar product titles, it is hard for us to ensure the product you have bought.
Could you please tell us your order ID or the link of the product?
With your help, we can find a solution more quickly.
Looking forward to hearing from you.
Best regardsJeremy Stambaugh
August 5, 2016 at 5:35 pmPost count: 0It was only named as a
DC-DC 6~35V 1.0~35V Boost Buck Converter Adjustable Constant Output Voltage Step-Up Step-down Regulator
No code stated but it can be found here
https://www.amazon.co.uk/DROK-Converter-Adjustable-Step-down-Regulator/dp/B00SKP2IJ8
So I guess the code may be B00SKP2IJ8 ?
I asked the same question on the Amazon Forum
https://www.amazon.co.uk/forum/-/Tx1MW4S047RUCEF/ref=ask_dp_dpmw_al_hza?asin=B00SKP2IJ8and another customer has been able to get 4A at 15V so I must have received a faulty one. Is there a problem with this batch? I shall return to Amazon and consider whether to risk getting another or just go with something else. Shame as it was nice and compact, would have allowed different input/output voltages for future projects and should have been more powerful and better value than various boost only converters which only output at 12V.
Jeremy Stambaugh
August 5, 2016 at 5:40 pmPost count: 0Jeremy Stambaugh
August 8, 2016 at 9:16 amPost count: 0Input voltage 7.2V from a battery pack comprising 6 NIMH D cells in series. When I connect the battery pack to the input terminals, the red LED within the converter lights.
Output voltage set to 12V with adjustment screw.When I connect the output leads to a 12V 10W bulb the auto bulb lights. However, when I connect output leads to a 12V 21W auto bulb (which would obviously require an output current of 1.75A), the red LED turns off and the converter makes a high pitched whine and does not give any output. It will then not work at all for any wattage until I disconnect the battery input after which it will again power the 10W bulb but not the 21W bulb.
Hello Jeremy ,
Thank you for your cooperation.
As your description, the power of the battery pack is about 15W.
This problem may be caused by that the power of the 7.2 battery pack is too low to drive a 21W auto bulb.
Could you please try to use another power supply with lager power to check that if the product can drive the 12V 21W auto bulb or not?
If it still cannot work, please feel free to write back to us.
Hope this can help you.
Best regardsJeremy Stambaugh
August 9, 2016 at 12:00 pmPost count: 0Hi Jeremy,
Thank you for your reply.
Since the min. input voltage of the product is 6V and 7.2V is very near to 6V, could you please try to apply a power supply with higher voltage to check if the product can drive the auto bulb?
If not, this product may be defective.
Please write back to us and we will find a solution.
Best regardsJeremy Stambaugh
August 12, 2016 at 9:40 amPost count: 0OK I tried it with a 12V power pack and it worked fine but of course at an input of 12V it’s not having to boost the voltage which is the whole point.
I also tried it with a 9.6V source (8 AAs in a battery box with a PP£ connector). However the internal resistance of batery box connectors is high so not surprisingly the input voltage dropped below 6V when connected to a 20W load and the convertor turned off.
The point is I need this to work with my 7.2V battery pack. I am plugging the 7.2V pack straight into the inputs using 14AWG cables. The open circuit voltage is 8.2V and when I connect this directly to a 6V 25W bulb it lights no problem and the voltage drops to 7.7V. However when I plug it into the convertor and run a 12V 20W bulb the input voltage (i.e. the output of the battery) drops below 6V and the converter turns off. So I can only conclude that when outputting 12V to a 12V 20W bulb, the converter briefly draws significantly more input current (which I can’t measure as the unit quickly turns off) than the 6V 25W bulb does when connected directly causing the battery pack voltage to drop below 6V so the converter must be very inefficient? I also tried ordering the same converter again with exactly the same results so clearly this unit works fine for operating 12V 10W loads from a 7.2V battery pack but is not suitable for larger loads so I will return these to Amazon.
Can you recommend a more suitable converter which can run 12V devices up to about 40W from the 7.2V battery pack? When running a 6V 55W bulb the battery pack voltage drops to 5.6V so I’m guessing 40W is about where the 7.2V pack will drop to 6V. I was hoping for one with a minimum input voltage of 6V which would protect the battery pack from overdischarge cell reversing etc. but perhaps one with a lower input voltage would be more robust and I’ll just have to keep an eye on the battery voltage with a voltmeter.
Thanks for your advice
Jeremy
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