- Joined
- Feb 8, 2013
- Messages
- 89
- Points
- 8
hey. good afternoon.
i bought this laser module https://nl.aliexpress.com/item/1-6-...190.html?spm=a2g0s.9042311.0.0.75de4c4dyHjdyg
wich arrived yesterday.
i wired it up like this
so the 12v input has it's own sepperate 12v rail from an atx psu (it's the psu i turn my 3d printer on with) (also measured with a multimeter btw. 11.9v)
i put a 12v to 5v regulator between the fan output (2 wires powered by a mosfet with a floating ground. basicly the + always outputs 12v and the ground opens and closes to created a pwm signal)
so there is an lm8705cv turning that 0-12v signal into a 0-5v signal. (confirmed with multimeter)
when i turn the power on. the laser just turns on. and it stays on uncontrollable. untill the driver starts heating up.
when the driver is warm. and there is 0v on the control plug the laser will dim to like 1% or something. not off. (only if the control is plugged in though. if i leave it unplugged the laser stays on)
if i turn the fan speed to 99% (this gives it a pulse width modulated signal with a duty cycle of 99%) the laser is on full power.
however if i set it to 100% wich is a full duty cycle. constant 5v, the laser just dims to 1% again.
on the driver there are 2 components heating up.
there is a 1ohm resistor heating up. this must be part of the current limiting circuit.
and there is a single direction diode. near the 12v input that also heats up.
these are hot enoegh to burn skin. i added heatsinks but that just slows down the heating. eventually it's still too hot to touch.
the laser module itself (feeling the heat of the heatsink) also gets warm. not hot but warm. though i would not be supprised if it would get hotter and hotter on longer engravings.. should i just 3d print an enclosure for the driver and laser and just run a high powered fan to keep things cool? or is this thing broken and should i ask for a refund?
(currently making a video and uploading it to youtube so you can see this)
laser turning off at 100% signal. (don't worry i know about the light. my eyes are not the camera. i am not looking at the dangerous light)
laser is controllable in brightness. and a look at the driver without the added heatsinks. and me burning my finger on the diode.
(again. i am not looking in the direction of this laser light.) keeping it even out of my peripheral vision. or blocking it with the other hand.
video showing the laser dimming after the driver heats up. (there is a 0v signal so the laser should be off from the start. but it only goes off after heating up)
i did not know this at that point yet. so i thought it was dimming because it heated up..
and the last video
here i did know it would only be controllable when warm
i bought this laser module https://nl.aliexpress.com/item/1-6-...190.html?spm=a2g0s.9042311.0.0.75de4c4dyHjdyg
wich arrived yesterday.
i wired it up like this
so the 12v input has it's own sepperate 12v rail from an atx psu (it's the psu i turn my 3d printer on with) (also measured with a multimeter btw. 11.9v)
i put a 12v to 5v regulator between the fan output (2 wires powered by a mosfet with a floating ground. basicly the + always outputs 12v and the ground opens and closes to created a pwm signal)
so there is an lm8705cv turning that 0-12v signal into a 0-5v signal. (confirmed with multimeter)
when i turn the power on. the laser just turns on. and it stays on uncontrollable. untill the driver starts heating up.
when the driver is warm. and there is 0v on the control plug the laser will dim to like 1% or something. not off. (only if the control is plugged in though. if i leave it unplugged the laser stays on)
if i turn the fan speed to 99% (this gives it a pulse width modulated signal with a duty cycle of 99%) the laser is on full power.
however if i set it to 100% wich is a full duty cycle. constant 5v, the laser just dims to 1% again.
on the driver there are 2 components heating up.
there is a 1ohm resistor heating up. this must be part of the current limiting circuit.
and there is a single direction diode. near the 12v input that also heats up.
these are hot enoegh to burn skin. i added heatsinks but that just slows down the heating. eventually it's still too hot to touch.
the laser module itself (feeling the heat of the heatsink) also gets warm. not hot but warm. though i would not be supprised if it would get hotter and hotter on longer engravings.. should i just 3d print an enclosure for the driver and laser and just run a high powered fan to keep things cool? or is this thing broken and should i ask for a refund?
(currently making a video and uploading it to youtube so you can see this)
laser turning off at 100% signal. (don't worry i know about the light. my eyes are not the camera. i am not looking at the dangerous light)
laser is controllable in brightness. and a look at the driver without the added heatsinks. and me burning my finger on the diode.
video showing the laser dimming after the driver heats up. (there is a 0v signal so the laser should be off from the start. but it only goes off after heating up)
and the last video
here i did know it would only be controllable when warm
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