Hmm yeah should be.. I don't know how that scale works though.So this is what I think is 200mA?
If I were you, I'd confirm with the other one set to 500ma.
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Hmm yeah should be.. I don't know how that scale works though.So this is what I think is 200mA?
Hmm yeah should be.. I don't know how that scale works though.
If I were you, I'd confirm with the other one set to 500ma.
Well, hooray!
Looks like your driver is set to go then!
So this is with the pot turned almost all the way "up" (low resistance), right?
Now just be careful to discharge any capacitors you might have in your driver before
connecting the laser diode.
This pot is finicky, in the middle of the rotation is approximately where the lowest current can be found while at the end of both directions it is at it highest current. I've read about discharging but haven't attached the laser yet, but thanks for reminded me.
Interesting - not input caps - just output.
Is that crucial?
I disagree, even in the same production lot there can be variations in the voltage drop it regulates for, if one regulates for 1.24 volts and the other for 1.26, only one will take all the load if they are connected with all pins together....
EDIT: more specifically:
You there have inputs and outputs tied up together, but ADJ pins independents ..... and two independents resistors for current settings, each one with its own value (tolerances means that is very difficult that you get 2 resistors 100% identicals) ..... what happens now, here ?
When, as example, one of the two ICs increase the voltage for keep the current, it reflect on the second one, that maybe is already ok, then the second one feel more current than the programmed one, and try to lower it forcing its output lower, but this reflect back on the first one ..... and so on, endless.
This can end in a self-oscillation cycle, or in the burning of one of the regulators (if they don't go in protection in time), or in the burning of the laser diode (cause in oscillation cycle, the regulators don't regulate at all )
Check that the two LM317 are from the same producer and production lot (this means ALL the numbers and cyphers on them MUST be identicals, not just the part number) ..... then parallel them directly pin-to-pin ..... then connect them as if they was a single regulator, with a single resistor ..... and don't forget the capacitors, both at input and output .....