[-] TDSOJohn@lemmy.world 4 points 1 day ago

Wait till he discovers how many times we europeans burned things to achieve sh*t

[-] TDSOJohn@lemmy.world 2 points 5 days ago

Low side switching is not an option unfortunately. Are the N-fets a solution to the transistor voltage drop?

Also, do you think we should be looking for a replacement for the LM317 for future designs?

[-] TDSOJohn@lemmy.world 2 points 5 days ago

Thanks. J5 is 6 parallel jumpers to probe and adjust the current via RV[1-6]. J6 is connected to the laser diodes. As explained in another answer, we unfortunately must use a common ground.

[-] TDSOJohn@lemmy.world 2 points 5 days ago

hi, thanks for the early reply.

the relevant output is j6 which is connectect to six red lasers with separate positive terminals and a common ground to power them independently using the pwm function of arduino. They should be a mostly resistive load but they have quite high parassitic capacitance. We can't have separate grounds and switch low side since the external casing of the lasers is connected to the negative terminal of the laser diode and it is bolted to the same aluminum frame. The lm317 is working as a constant current driver and we found online that it's best to switch Vi instead of ADJ in this case link. Is it possible to use the circuit in the first schematic of the link to solve this? We are currently dropping .7V between base and emitter of the transistors.

Could otherwise placing the switching transistor after the cc driver be a solution?

The circuit seems to work perfectly with a lower voltage laser diode and doesn't seem to have problems with transients. Also thanks, will try to simulate it in spice!

20

Hello everyone, We have a problem with a circuit we built. The circuit seems to work properly with a green laser diode (130mA, lower voltage). With the red laser (higher voltage) on the other hand, the circuit delivers only 60mA max of the 130mA it should be giving the laser.

The problem seems to be the transistor's resistance because it works properly if we bypass the transitor and give +5V to the LM317.

Is it this assumption correct?

We tried a few transistors (BC241, BC236, TIP41C and TIP41) but with no luck. Is there a way to find a drop-in replacement for the transistor? MOSFET seem to have lower resistance but require an external driver with Arduino.

We need to use the Arduino PWM with these drivers, so at least 980hz switching frequency is needed.

Thanks in advance

Link to the schematics

[-] TDSOJohn@lemmy.world 2 points 2 months ago

They definitely mastered building houses on private islands

[-] TDSOJohn@lemmy.world 5 points 4 months ago

Pleas guys, learn from the Brigate Rosse. Put him in a f*cking trunk (use a chrysler pt cruiser for the occasion please) and goodnight.

[-] TDSOJohn@lemmy.world 2 points 1 year ago

Thanks everyone for the answers, that’s really good news! I will try to plant some other edible things in my garden too now!

19

Hello everybody, I’ve just moved and the new home’s garden has onions, mint, salvia and other edible plants growing near a Rhododendron (between 50cm and 2mt away, growing in the same piece of land).

Is it safe to eat any of it? Or is it possible to “save” the salvia and rosemary by moving them to a separate pot and waiting for sometime?

1
submitted 2 years ago by TDSOJohn@lemmy.world to c/blender@lemmy.world

Good morning,

Hope this is not a stupid question, I am very new to Blender. So, my setup is:

  • 3d env built from iPad photogrammetry

  • we insert some lasers (a simple cylinder with emission node)

  • we control the lasers using QLC+ --> artnet --> BlenderDMX and a python expression that modulates the emission color for every laser from a separate dmx channel.

We would now love to be able to store the dmx animation directly in blender as keyframes in order to export the animation and put it back on the iPad for AR simulation. Is there any way to record the driver data in real time?

0
submitted 2 years ago by TDSOJohn@lemmy.world to c/blender@lemmy.world

Hello everyone, I have a question about Blender properties. I'm reading BlenderDMX documentation and at page BlenderDMX docs paragraph "BlenderDMX DMX driver for Blender" it says that I can use DMX signals to control any Blender property. I also have modelled some lasers and would love to control some of the nodes' properties (Emission Color mostly) with DMX for a simulation. Does anyone know if that's possible and how to do it? A search for "blender properties" and "blender property keywords" gave me nothing.

TDSOJohn

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