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Old 05-05-2011, 04:05 AM #1
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Default Dummy Load

Not sure if this was a waste of time or money, but I was bored. Used 1N5402, was the only thing RatShack had enough of. I swear someone in town besides me is building lasers. Measured the voltage drop on these, was .75V @ 700mA. I had a tap on the board for 2 diodes as well, but could only find a 6 position rotary switch. Anyway thanks for looking, comments welcome.

Dummy Load-dummy.jpg



Last edited by CDDZ; 05-05-2011 at 06:10 AM. Reason: Typo
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Old 05-05-2011, 06:46 AM #2
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Default Re: Dummy Load

maybe not!
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Old 05-05-2011, 11:51 AM #3
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Default Re: Dummy Load

Quote:
Originally Posted by CDDZ View Post
Not sure if this was a waste of time or money, but I was bored. Used 1N5402, was the only thing RatShack had enough of. I swear someone in town besides me is building lasers. Measured the voltage drop on these, was .75V @ 700mA. I had a tap on the board for 2 diodes as well, but could only find a 6 position rotary switch. Anyway thanks for looking, comments welcome.

Attachment 32564
Nicely done....
Where is your 1 Ohm resistor to check the current that
your driver is adjusted to...
After all.... that is really what a Test Load is for...


Jerry
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Old 05-05-2011, 12:43 PM #4
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Default Re: Dummy Load

Quote:
Originally Posted by lasersbee View Post
Nicely done....
Where is your 1 Ohm resistor to check the current that
your driver is adjusted to...
After all.... that is really what a Test Load is for...


Jerry
It is a 10Watt it's up top with VOM written on it

Last edited by CDDZ; 05-05-2011 at 09:53 PM. Reason: spelling
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Old 05-05-2011, 07:42 PM #5
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Default Re: Dummy Load

Quote:
Originally Posted by CDDZ View Post
It is a 10Watt it's up tom with VOM written on it
ROFLMAO..... I better put my glasses on...
It couldn't have been any bigger....

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Old 05-06-2011, 02:36 AM #6
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Default Re: Dummy Load

LOL
I hate when that happens

Last edited by CDDZ; 05-06-2011 at 02:37 AM.
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Old 05-07-2011, 05:43 AM #7
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Default Re: Dummy Load

LOL, I missed it too. It blends right in with the breadboard color.

Looks great too!

Last edited by jcranmer; 05-07-2011 at 05:44 AM.
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Old 05-07-2011, 05:50 AM #8
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Default Re: Dummy Load

So your resistor looks like a wire wound type, wire wound resistors are inductive and should not be used with boost type drivers as it can kill the driver. the correct type of resistor to use is a thick film resistor.
this is info handed down from Dr. Lava...
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Old 05-07-2011, 06:26 AM #9
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Default Re: Dummy Load

Quote:
Originally Posted by Flaminpyro View Post
So your resistor looks like a wire wound type, wire wound resistors are inductive and should not be used with boost type drivers as it can kill the driver. the correct type of resistor to use is a thick film resistor.
this is info handed down from Dr. Lava...
As in it will kill the driver when setting the current?
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Old 05-07-2011, 11:53 AM #10
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Default Re: Dummy Load

Quote:
Originally Posted by Flaminpyro View Post
So your resistor looks like a wire wound type, wire wound resistors are inductive and should not be used with boost type drivers as it can kill the driver. the correct type of resistor to use is a thick film resistor.
this is info handed down from Dr. Lava...
I have a problem seeing an issue with that...

If the output of the Boost Driver is properly filtered DC (as it
should be).., I can't see any problem using a 1 Ohm wire wound
resistor... (for a 1 Ohm resistor to have many turns of wire...
the wire will need to have a huge diameter)

DC does not make a difference in the inductance of a coil...
unless the DC is being switched on and off.... which proper
Boost filtering should get rid of....


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Last edited by lasersbee; 05-07-2011 at 11:55 AM. Reason: Spelling errors
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