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Old 01-29-2008, 07:26 AM #17
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Default Re: actual CURRENT? after the dead LD and resistor

Here is my "canned" response...lol

The LM317 is no mystery and very easy to work with. The following calculations always apply since it uses 1.25 volts for its reference voltage.

To calculate the resistor needed for a given current, take 1.25 and divide it by the current. So say you want to drive a SenKat diode with 250 ma's. 1.25 divided by .250 = a 5 ohm resistor.

Another way you could do this is to take 1.25 and divide it by the resistance. 1.25 divided by 5 = .250.

Next you will want to calculate the wattage of the resister needed. We know 1/2 watt resistors are common for use with the regulator. But to figure it out, simply take the 1.25 and multiply it times the current. 1.25 times .250 =.3125 watts.

The rule of thumb for the voltage going into the regulator is it should be 3 volts more than the voltage going to the diode. A SenKat diode running at 250ma's will have about 3 volts across it. Therefore a minimum if 6 volts is needed.
I recommend 6 nimh batteries or 2 RCR123's for use with Daedal's driver.


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Old 01-29-2008, 07:35 AM #18
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Default Re: actual CURRENT? after the dead LD and resistor

its clear to me now : from your big help and concerns , im starting to build a nice and well DVD laser project, after i finished it i will post some images or video of the result. ;D
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