PDJ Weekly Livestream # 17

Рет қаралды 523

Күн бұрын

Пікірлер: 11

@yeroca 4 ай бұрын

If you isolate the system ground from the chassis ground, using an oscilloscope on the circuit will require a differential probe, because otherwise a "normal" scope's probe ground is connected to its chassis ground, and if you connect the probe ground to the system ground, you'll effectively be connecting system ground to the chassis ground through the oscilloscope's probe which might cause some erratic behavior. That said, I don't know if you need to put an oscope on the circuit ever. Just a consideration.

@harrisonlow 4 ай бұрын

Ah yes, thank you for mentioning this! I have consulted with The Expert (ChatGPT) and it is suggesting to get a non-isolated PSU, which I agree would solve all these issues-including being able to 'scope in if I ever need to (🤞it never comes to that)-without the sketchiness of circumventing the isolation of my current PSU.

@harrisonlow 4 ай бұрын

On further reflection, this actually isn't how this would work and a non-isolated PSU would be a terrible idea 😅 I've done some reading and it looks like the CAN transceivers on the ODrive Pros can be fully isolated from the motor PSU, meaning I don't need to connect the main motor PSU GND to the 12V (CAN) GND. I *think* this is the actual solution!

@lalilaloe 4 ай бұрын

As far as drone motors go, you could use bigger one like a 2812 motor. It will handle the heat better and proven to run on 12s that some bigger cinelifter drones use

@harrisonlow 4 ай бұрын

Do you think those would still have a low enough inertia to be moved around by the ball without needing a teeny spool? I'll have a look around to see how much they are. If they're fairly cheap I might pick up a few 😁

@harrisonlow 4 ай бұрын

Or perhaps it's a good idea to just try out a bunch 🤔

@kakke_no 4 ай бұрын

For small soldering jobs you should use a heat plate

@harrisonlow 4 ай бұрын

Any suggestions for cheap(ish) ones? Would one work for adding chips to double-sided boards?

@marcus3d 4 ай бұрын

C'mon, molex are the worst! The stupid pins flail around wildly, they grip way too hard, and the connectors don't have big enough ears for disconnecting them. The least horrible ones have a kind of flaps that you press to disconnect, but they're not working very well either.

@harrisonlow 4 ай бұрын

Haha have you done much work with JST?

@marcus3d 4 ай бұрын

@@harrisonlow Well, sometimes JST can be even worse when they're super stuck, for the same reason molex is awful. But that's only for logic. Or if I need longer cables I use RJ45 or USB-C connectors. For power I use normal 5.5x2.5 DC connectors..