On that page, he is using a DC power supply, but in current-regulating mode (the red light by the word "current"). This allows the DC power supply to act as a driver directly passing regulated current to the diode.So on this page he uses the DC power supply connected to the Driver then to Diode itself?
I thought DTR always attached a driver on for those tests. Maybe I'm wrong.On that page, he is using a DC power supply, but in current-regulating mode (the red light by the word "current"). This allows the DC power supply to act as a driver directly passing regulated current to the diode.
That's exactly what I used.On that page, he is using a DC power supply, but in current-regulating mode (the red light by the word "current"). This allows the DC power supply to act as a driver directly passing regulated current to the diode.
It has to be stable, but doesn't take a professional tool. As long as it isn't a cheap Chinese switched-mode PSU it'll probably work.Thanks, I always thought he tested with the driver as well. Now I know different.
Edit: Totally ignore me. Makes perfect sense when I look closer at the voltage/current readings done by DTR. They match the diode inputs, not the driver inputs. Guess I never really paid much attention to it as I buy my modules with the driver already set.
Anyway, surely you must have to have a relatively stable power supply (like DTR's) still in order to keep the current within the tolerance. Or am I wrong on that too.
WRONG, that's not what it means, it means your current is limiting, when you reach 4.0 amps or your target you should turn the voltage down slowly until it lights up indicating it is in regulation too.That's exactly what I used.
The red light by the word "current" means that current is flowing through the wires - something is attached and working.
Yes I have found it is a very easy way provide a great visual representation of the power curve of a diodes. Direct driving can be done but there is risk. I don't suggest direct driving specially to those without a lot of experience doing so with laser diodes on the equipment they have and who accept the risks associated with it.Curtis, DTR has always used a voltage and current regulated power supply to show the current the diode is using to produce the power it is putting out. This has been his procedure for years.
Yes this is a good way to minimize some of the risks of direct driving and to add to that before power cycling or disconnecting the diode turn both the voltage and current back to zero.Of course you can use a bench regulated supply to power diodes directly. A driver is, after all, a miniaturized constant current supply.
Some caution is needed, though:
-Use a good supply without significant spikes and good regulation
-Have the psu on, at 0V 0A before connecting the diode
-Touch positive to negative before connecting the diode
-After connecting turn up the voltage and only then turn up the current, taking care to avoid overshooting