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I still dont know why it did not stick leads no matter how much i heat it. it was like soldering proof lol.. when thinks dont work out i use lots of flux and use a knife to clean the surface to be soldered.
Lots of things don't solder well. What may have been in the mask is Stainless Steel. That won't solder well. Resistance wire won't either. Neither will tungsten tantalum or molybdenum. Indium solder sticks to nearly everything, but it melts close to room temperature.
Now, you can braze or "silver solder" stainless steel.
Continuing on this topic just want to ask somewhat related question. I notice at the back of the power supply it says that the output is 5.7v 800mA does this means that the total wattage delivered from this power supply is around 4.5W (5.7v x 0.8A) ?
Thanks
I've tried using the power supply in my breadboard and notice that when I test using a resistor and after few seconds it became very hot (and also heard a high pitch sound) and when I try to understand why the resistor become very hot, it clicked my mind that it must be something got to do with the power supply which is delivering 800mA. Checking the resistor that I have seems like it can only take 1/2W. Looks like from this exercise if I want to use the power supply for the breadboard I will need to reduce the current.
what is the resistance value of the resistor ?
was it the only component across the power supply ?
The value of the resistor was 1000ohms and it was the only component I tested out with the power supply.
OK do some Ohm's law
5.7V / 1000 Ohms = 0.0057A = 5.7 milliAmps
5.7V x 0.0057A = 0.0325 W 32.5 milliWatts
that isnt going to make a 1/2 Watt resistor warm let alone hot
so it begs the question, did you read the resistance correctly ?
Dave