Dummy Load

[CDDZ]

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.

 

[try2die]

maybe not!

 

[lasersbee]

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.

View attachment 32564

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


Jerry

 

[CDDZ]

Nicely done....
Where is your 1 Ohm resistor to check the current that
your driver is adjusted to... :thinking:
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

 

[lasersbee]

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....:crackup:

Jerry

 

[CDDZ]

LOL
I hate when that happens

 

[jcranmer]

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

Looks great too!

 

[Flaminpyro]

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...

 

[CDDZ]

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?

 

[lasersbee]

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....


Jerry