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Old 03-05-2008, 07:22 PM #1
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Default mxdl batteries

are there any 3.0v rechargeable batteries on dx, for the mxdl torch? I looked, but couldn't find any.
That is the right voltage, isn't it?


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Old 03-05-2008, 07:36 PM #2
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Default Re: mxdl batteries

would these do:
http://www.dealextreme.com/details.dx/sku.723

or is the lack of pcb a big thing?

THese are another option;
http://cgi.ebay.co.uk/ws/eBayISAPI.d...ksid=p3907.m29
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Old 03-05-2008, 10:09 PM #3
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Default Re: mxdl batteries

If you are doing the MXDL laser or LED mod you want to get RCR123's and a charger:

http://www.dealextreme.com/details.dx/sku.3273


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Old 03-06-2008, 06:40 AM #4
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Default Re: mxdl batteries

doesn't it need 3v?
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Old 03-06-2008, 06:50 AM #5
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Default Re: mxdl batteries

Quote:
Originally Posted by robjdixon
doesn't it need 3v?
What are you trying to do? Build a laser or what? DDL's driver needs a minimum of 6 volts.
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Old 03-06-2008, 07:01 AM #6
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Default Re: mxdl batteries

So I need 3.6v batteries?
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Old 03-06-2008, 07:04 AM #7
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Default Re: mxdl batteries

Quote:
Originally Posted by robjdixon
So I need 3.6v batteries?
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 03-06-2008, 07:05 AM #8
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Default Re: mxdl batteries

I am building a laser
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