Re: feesible idea for soldering ic's?


"Michael A. Terrell" <mike.terrell@xxxxxxxxxxxxx> wrote in message
news:4632A512.40090EAC@xxxxxxxxxxxxxxxx
Jon Slaughter wrote:

I have seen a method similar to this and I think a link was posted with
video's on how to do it. I was just wondering about my specific example
and
if it would work at all. I would imagine if the voltage was low enough
that
it would be ok?


Do the math. The lower the voltage, the higher the current
requirements. It becomes even harder to control the current
distribution, making it even harder to control the temperature.



Huh?

V = IR

and P = V*I

Thats the math.

Whats your point? R is about, say, 10^(-3)?

If V = 1 then I = 1000A.

this means you have about 1000W instantaneous. You only need it for probably
a few milliseconds if that.

If you need less current then you could lower the voltage or add some series
resistance or even a current limiter or something.

You don't need to control the temperature. Its not some precision thing.
Just need to supply enough current to meld the solder.

I would imagine 100W might do it just fine for about 1/10 to 1/5 a second.
This means having a voltage of about 3/10V.

You could probably use sensors to monitor the power supplied. Obviously as
it gets hotter the resistance will increase but this is pretty well known.
Although if it gets to hot then it could destory other parts I do not think
this is that big of an issue as it can be controlled.

As you pointed out, I think the real issue is current feeding into other
parts of the circuit and into the ic.




.

Relevant Pages

  • Re: Havent done anything real with OOP yet.
    ... >> temperature is measured. ... then Plant is more like what I assumed for Building and the Resistor ... I was using some traditional terms from control theory without ... the measured temperature goes out and the computed voltage comes in. ...
    (comp.object)
  • Re: Liquid level indicator
    ... To keep the wort at a set temperature when recirculating - losses ... > The pump will be pumping the liquid at all times when the heater is on, ... > control and a normal glass thermometer may well be a better solution. ... > required for the heater element running on mains voltage. ...
    (sci.electronics.basics)
  • Re: Could someone please explain how this works?
    ... for R5 will raise the upper temperature limit. ... This circuit compares the voltages from two resistive voltage dividers, one made with 3 fixed resistors, one of which has a variable tap, and one made with a fixed resistor and a temperature dependent resistor. ... As temperature falls, the resistance of the thermistor rises, lowering the voltage from its divider. ...
    (sci.electronics.basics)
  • Re: Electrolysing Steam
    ... >> temperature, and a tunnel diode exhibits a reduction in resistance as ... >> he was working with was a function of temperature hence voltage, ... I very much doubt that Ohm was much ...
    (sci.energy.hydrogen)
  • Re: Electrolysing Steam
    ... >> temperature, and a tunnel diode exhibits a reduction in resistance as ... >> he was working with was a function of temperature hence voltage, ... I very much doubt that Ohm was much ...
    (sci.energy)