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I have a basic cheap china DC 72 volt to 12 volt 10 amp power supply. When I connect the 72 volts I get a large spark.
I want to use an On/OFF switch on the power supply.
I heard someone say if you use a very large value resistor, like a 10K resistor, you can keep that permanently connected to...
Yes it did work at 73 volts. Yes I wired enabled, but even without enabled on it still draws a small amount of current.
It has hard to imagine ESD damage unless it can happen on the big voltage prongs as that is all I have touched.
It seems the 82 volts broke it. Never even turned on for a...
I'll try to see it if will just work again, was trying that yesterday.
I'm hoping I can return it for my money back.
What surprises me is that the default over voltage value is 110 volts. I really thought it would handle the 82 volts.
The only thing I can think of is I didn't precharge it...
Very bad news, I decided to test it on 82 volts and guess what. It never turned on and won't turn on even at 50 volts.
I don't think it is a fault that needs to be reset because I assume disconnecting power and reconnecting power again would restart it.
Do you think I burnt it out immediately...
I have major problems. However, I don't think anything is wrong after looking at the specs.
When I connected 73 volts to my DC DC isolated power supply, I am able to get 12 volts on the output.
However, the power supply gets very warm and it has the heat spreader. It keeps climbing and I...
I'm not happy about having to exceed the specifications. However, there really doesn't exist anything out there as small and as powerful that will meet my voltage requirements. These seem to be cost effective because they are made in large quantities as a standard size and power.
Take a look at...
thanks for the recommendation.
For my requirements this will go on an electric bicycle and weight and space is very important.
You can not beat these tiny telecom power supplies for price/performance/weight/size.
It seems there are very few power supplies that supply higher DC volts and are...
I found a perfect DC-DC converter for my application, but it is rated for 36-75 volts input voltage.
I will use a lipo battery pack rated at max charge of 82 volts. The voltage will range from 66 volts to 82 volts as I use the battery.
Do you think I can get away with exceeding the maximum...
I get it, I thought a higher voltage would lead to a larger voltage drop compared with a lower voltage.
What confused me was that raising the voltage normally causes a higher current in most applications and more heat, but that has nothing to do with my question as I said I would use a constant...
For example, say I have 5 batteries in series. Each battery is connected by 1 foot of wire for a total of 4 feet. Each battery has 4 volts for a total voltage of 20 volts.
My load will use a constant current.
When calculating voltage drop in the 4 feet of wire, would I use:
total voltage of...
The specs look exactly the same. I was told by someone that there is no difference. But there must be a difference because why would one fet cost more.
Does anyone have an idea, I'm very confused. Thanks...
I'm troubleshooting a circuit board. The potentiometer is a 1K rotary dial one.
With the circuit board not powered it seems to test fine with an ohms meter.
886 ohms the two outer prongs
Either of the two inner prongs range from 6 ohms to 886 ohms while I turn the knob.
When I apply power...
Audioguru: Yes that is a very good point and one I actually only solved recently.
Do you know if there is a way to calculate how much current will flow between two different voltages? Like if the DC converter is 8.2 volts and the battery is 7 volts? Is there some kind of formula to figure this...
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