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Old 10-11-2007, 12:22 PM #385
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Default Re: DIY Homemade laser diode driver

sorry i should have know that 8 megs would be to big.


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Old 10-11-2007, 12:25 PM #386
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Default Re: DIY Homemade laser diode driver

much better! now i can see it lol
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Old 10-12-2007, 01:30 AM #387
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Default Re: DIY Homemade laser diode driver

so does anyone have anything to say about this.
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Old 10-12-2007, 02:56 AM #388
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Default Re: DIY Homemade laser diode driver

What is the voltage and current on your test load?
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Old 10-12-2007, 05:21 AM #389
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Default Re: DIY Homemade laser diode driver

Stump, it looks good in the pictures... let us know what you get on the test load.

What's your input voltage?
What's your output voltage?
Is your current looking good?



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Old 10-12-2007, 03:00 PM #390
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Default Re: DIY Homemade laser diode driver

is 5 0hms a good test load?
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Old 10-12-2007, 10:55 PM #391
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Default Re: DIY Homemade laser diode driver

Probably, ya

I would try that and some LEDs

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Old 10-16-2007, 09:28 PM #392
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Default Re: DIY Homemade laser diode driver

DDL I have 5 Ohms across the adj. and a 10 Ohm test load and the results are: Output 2.34v and 208 ma
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Old 10-16-2007, 10:04 PM #393
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Default Re: DIY Homemade laser diode driver

You should be getting closer to 250ma's. What is the voltage of the batteries with the load applied.
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Old 10-16-2007, 10:37 PM #394
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Default Re: DIY Homemade laser diode driver

5.3 volts
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Old 10-16-2007, 11:29 PM #395
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Default Re: DIY Homemade laser diode driver

The regulator is beginning to drop out. You really need a minimum of 6 volts for it to regulate properly...this explains why you are not seeing 250ma's.

The formulas are 1.25/ohms = current.
1.25/current = ohms.

1.25 is the reference voltage the regulator uses and you should always see that voltage between the output and adjust pins of the regulator.
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Old 10-16-2007, 11:48 PM #396
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Default Re: DIY Homemade laser diode driver

Should i use a 9 volt then

or will the drop be less with the diode since i am using a 10 ohm load now
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Old 10-16-2007, 11:58 PM #397
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Default Re: DIY Homemade laser diode driver

i just tried a silicon diode instead of the resistor for the load and got 250 ma but the out voltage was over 5.
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Old 10-17-2007, 12:03 AM #398
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Default Re: DIY Homemade laser diode driver

Don't use those little square 9 volt batteries as they will not power it for long and are not made to deliver high currents.

If it was me I would get a 6 AA or AAA battery holder. You could use Alkaline or Nimh batteries and it would a no muss no fuss solution. Or you could use a pair of AA li-ion batteries.

At 5.3 volts, I the regulator will be out of regulation with the GB diode hooked up. I know this isn't what people want to hear but others have had problems even using a pair of CR123's. The voltage sags to the point the regulator begins to drop out.

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Old 10-17-2007, 12:07 AM #399
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Default Re: DIY Homemade laser diode driver

Quote:
Originally Posted by stump56
i just tried a silicon diode instead of the resistor for the load and got 250 ma but the out voltage was over 5.
Because you are not putting enough of a load on it. A silicon diode has about a .7 volt voltage drop. You need 4 silicon diodes hooked in series to simulate appx. what a GB diode will pull.
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Old 10-17-2007, 12:33 AM #400
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Default Re: DIY Homemade laser diode driver

what type of li ion AA Will the energizer type work i thought they were 1.5 volts apiece
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