- Joined
- Sep 20, 2008
- Messages
- 17,635
- Points
- 113
Driver Test
First... Alx... sorry this took so long... I've been swamped with work...
Well... I finally found some time to test "Alx's" driver...
First let me say that even though the "Alx" and "rkcsr" (old) driver seem to
look the same... they are not the same PCB or Layout..IMHO
The printed circuit board traces are not identical and they do not run
the same routing paths..
The electronic parts used may have a similar function... but they are not the same....
The "rkcsr" PCB measures 0.361" X 0.695" and is manufactured on .031" thick board
The "Alx driver measures 0.375" X 0.700" and is manufactured on .062" thick board
So much for the visual....
I used a 6 diode test load with a 1 Ohm resistor in series... I supplied 9VDC
from a variable Power Supply..(so that the supply would not sag as with batteries)
I check the output current and voltage.. The PCBs were on an insulated surface
in free air (no heatsinking)..
First the "rckstr" driver...
027 ma ............. 4.29 Vdc .............. Min Pot setting
050 ma ............. 4.53 Vdc
100 ma ............. 4.75 Vdc .............. starting to warm up
150 ma ............. 4.87 Vdc
200 ma ............. 4.94 Vdc
250 ma ............. 4.96 Vdc
300 ma ............. 5.99 Vdc .............. Very hot to the touch
417 ma ............. 5.14 Vdc .............. Max Pot setting
It should be noted that it was next to impossible to adjust the current
accurately obove 200ma.
Now for the Alx driver...
029 ma ............. 4.37 Vdc .............. Min Pot setting
050 ma ............. 4.55 Vdc
100 ma ............. 4.76 Vdc .............. starting to warm up
150 ma ............. 4.88 Vdc
200 ma ............. 4.99 Vdc
250 ma ............. 5.00 Vdc
300 ma ............. 5.04 Vdc .............. quite hot to the touch
500 ma ............. 5.30 Vdc .............. Very hot to the touch
560 ma ............. 5.33 Vdc .............. Max Pot setting (stabalized Hot)
608 ma ............. 5.56 Vdc .............. Max Pot setting (PCB Hot)
701 ma ............. 5.70 Vdc .............. Max Pot setting (PCB Cold)
It should be noted that it was next to impossible to adjust the current
accurately above 400ma. That may be due to the physically larger pot used.
The current at the maximum setting decreased as the PCB heated up from
the higher current draw...
When I gently blew (without spitting:na onto the PCB.. the current started
to increase immediately..
I haven't seen the schematic of the Alx driver so I can't comment on that...
To sum it up... in my honest opinion...
The "Alx" and old "rckstr" drivers are 2 different Laser Diode drivers of different
output ranges... One is not better than the other for what it was designed...
Jerry
First... Alx... sorry this took so long... I've been swamped with work...
Well... I finally found some time to test "Alx's" driver...
First let me say that even though the "Alx" and "rkcsr" (old) driver seem to
look the same... they are not the same PCB or Layout..IMHO
The printed circuit board traces are not identical and they do not run
the same routing paths..
The electronic parts used may have a similar function... but they are not the same....
The "rkcsr" PCB measures 0.361" X 0.695" and is manufactured on .031" thick board
The "Alx driver measures 0.375" X 0.700" and is manufactured on .062" thick board
So much for the visual....
I used a 6 diode test load with a 1 Ohm resistor in series... I supplied 9VDC
from a variable Power Supply..(so that the supply would not sag as with batteries)
I check the output current and voltage.. The PCBs were on an insulated surface
in free air (no heatsinking)..
First the "rckstr" driver...
027 ma ............. 4.29 Vdc .............. Min Pot setting
050 ma ............. 4.53 Vdc
100 ma ............. 4.75 Vdc .............. starting to warm up
150 ma ............. 4.87 Vdc
200 ma ............. 4.94 Vdc
250 ma ............. 4.96 Vdc
300 ma ............. 5.99 Vdc .............. Very hot to the touch
417 ma ............. 5.14 Vdc .............. Max Pot setting
It should be noted that it was next to impossible to adjust the current
accurately obove 200ma.
Now for the Alx driver...
029 ma ............. 4.37 Vdc .............. Min Pot setting
050 ma ............. 4.55 Vdc
100 ma ............. 4.76 Vdc .............. starting to warm up
150 ma ............. 4.88 Vdc
200 ma ............. 4.99 Vdc
250 ma ............. 5.00 Vdc
300 ma ............. 5.04 Vdc .............. quite hot to the touch
500 ma ............. 5.30 Vdc .............. Very hot to the touch
560 ma ............. 5.33 Vdc .............. Max Pot setting (stabalized Hot)
608 ma ............. 5.56 Vdc .............. Max Pot setting (PCB Hot)
701 ma ............. 5.70 Vdc .............. Max Pot setting (PCB Cold)
It should be noted that it was next to impossible to adjust the current
accurately above 400ma. That may be due to the physically larger pot used.
The current at the maximum setting decreased as the PCB heated up from
the higher current draw...
When I gently blew (without spitting:na onto the PCB.. the current started
to increase immediately..
I haven't seen the schematic of the Alx driver so I can't comment on that...
To sum it up... in my honest opinion...
The "Alx" and old "rckstr" drivers are 2 different Laser Diode drivers of different
output ranges... One is not better than the other for what it was designed...
Jerry
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