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Old 09-01-2010, 02:13 AM #1
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Default microboost acting weird

so i was testing my new microboost to use with a 445nm, and i had a test load of 4x 1n4001 diodes in series, and i was also measuring current. powered the driver with a power supply at 3.6v, with a 3A max. however, the max current i could get after turning the pot was 840mA and the min current was 360 mA. this isnt a range that drlava lists on the manual. maybe i soldered a little too much when jumping the resistors on the driver??? is the driver still safe to use? it did sit at a very constant current though when running the test load


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Old 09-03-2010, 06:59 AM #2
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Default Re: microboost acting weird

Hi, the ranges listed are a bit conservative, it's not uncommon for the actual full range to extend somewhat beyond the listed range. A photo of the range side would clarify this as well. Also, with current limiting power supplies, make sure that it isn't fooled by the pulse of high current when you first connect the driver and turn it on. This exceeds 3A for a very short period of time.
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Old 09-03-2010, 07:09 AM #3
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Default Re: microboost acting weird

Can You upload a picture for Us?
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Old 09-03-2010, 06:52 PM #4
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Default Re: microboost acting weird

alright, heres a pic of it... dont laugh at my terrible soldering how do you guys get the solder to stick? do you apply flux first? anyway let me know if you think the bad soldering causes the 860mA max, and if you think it will kill my diode somehow. ps it DID kill the first 445nm diode i connected to it, but i think it was because the output leads to the diode were loose... i will resolder them and try again

http://www.flickr.com/photos/53594790@N02/4954983620/
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Old 09-03-2010, 07:20 PM #5
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Default Re: microboost acting weird

Quote:
Originally Posted by thebucketmouse View Post
so i was testing my new microboost to use with a 445nm, and i had a test load of 4x 1n4001 diodes in series, and i was also measuring current. powered the driver with a power supply at 3.6v, with a 3A max. however, the max current i could get after turning the pot was 840mA and the min current was 360 mA. this isnt a range that drlava lists on the manual. maybe i soldered a little too much when jumping the resistors on the driver??? is the driver still safe to use? it did sit at a very constant current though when running the test load
Looks like You are setting it for 540-1000ma range correct?

Can You show Your dummy load please? I don't see a problem with Your solder job..It's messy, but should be working. where are You measuring for Current?
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Old 09-03-2010, 07:24 PM #6
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Default Re: microboost acting weird

I used this liquid soldering flux it mades the solder stick and flow to where you it too.
A must have for soldering small stuff.
DealExtreme: $2.06 Goot Super Soldering Flux
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Old 09-03-2010, 07:55 PM #7
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Default Re: microboost acting weird

Try it with a different power supply (perhaps simply a quality, fully-charged, 18650 battery)

Also, we need to see the other side as well

Peace,
dave
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Old 09-05-2010, 08:30 PM #8
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Default Re: microboost acting weird

Quote:
Originally Posted by Coherent Light View Post
Looks like You are setting it for 540-1000ma range correct?

Can You show Your dummy load please? I don't see a problem with Your solder job..It's messy, but should be working. where are You measuring for Current?
the dummy load is just a breadboard with 4x 1n4001 diodes in series... not much to see because its not soldered, just on a breadboard. and i am measuring current in series through the diodes

edit: and dave, i will try the 18650 in a few days when it gets in from DX
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Old 09-05-2010, 08:55 PM #9
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Default Re: microboost acting weird

Can You Tell Us what Voltage You are reading on the output of the Driver?
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Old 09-05-2010, 09:08 PM #10
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Default Re: microboost acting weird

reading 3.5 volts across the output of the driver... is that normal?
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Old 09-05-2010, 09:30 PM #11
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Default Re: microboost acting weird

Measure the resistance of the pot at both max and min settings please.
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Old 09-05-2010, 09:37 PM #12
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Default Re: microboost acting weird

min: 5 ohm
max: 265 ohm
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Old 09-05-2010, 09:55 PM #13
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Default Re: microboost acting weird

Please measure the current at Min and Max across the Dummy load resistor, and We should have it all sorted out after that.


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Old 09-05-2010, 11:06 PM #14
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Default Re: microboost acting weird

well i dont have a dummy load resistor... just the 4x diodes. but current goes from 380mA to 860mA
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Old 09-05-2010, 11:11 PM #15
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Default Re: microboost acting weird

You need to have the resistor to get an accurate current reading and to set It. Try to get a high wattage 1 ohm resistor, and then take a reading. That should clear things up with the readings You are seeing vs Lava's manual.
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Old 09-05-2010, 11:16 PM #16
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Default Re: microboost acting weird

alright, ill get the resistor and get back to you... thanks a ton for the support so far though
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