The navy gave me a spool like 5+ years ago. It has no label. They were going to trash it. I have no idea whatsoever what its composition is. It’s rosin core and that’s about all I know. I also have a few different gauges of safety wire and shear wire.
It really depends how much power/current you are switching. If you are switching 1A with a beefy heatsink FET, the time spent in the linear region is short enough it shouldn’t be a problem. If you are switching 50A though it then you might have a problem. Depending on how that gate divider is set up, you could still potentially damage the gate of the FET when shorting it to ground to discharge it if I understand how its hooked up correctly.
Ideally you would use some kind of FET driver with a voltage source (e.g. linear regulator) to turn on and off the gate plus the gate resistor.
For something that’s not switching at a high frequency, slow rise and fall times are fine as long as you are staying within the safe operating area of your MOSFET. A 10K gate resistor could certainly work, but it will depend on your MOSFET and load.
That’s good. My switching frequency is a few times per hour.
I am a little bit concerned that the slow rise/fall time make the MOSFET go outside its operating parameters for a fraction of a second. The resistance gradually changes meaning the mosfet will dissipate more power but also less current will flow.
So if you switch many times per second the gate capacitance with the resistor acts as a low pass filter reducing the gate voltage.
As long as it fully saturates i thiink it’s fine, i’ve personally only had issues with too slow switching when i switch the mosfet many times a second, or when i didn’t give a high enough voltage to fully saturate it, both of which usually led to a smoky mosfet
Kester 63/37 no-clean 22AWG for leaded work, SN100C no-clean for RoHS. Mg chemicals and chip quik are good alternatives, Kester can be expensive to justify for home use.
I think it’s the your synapses you need to worry about, but I forget, I love my 60/40 too. Still have a couple big rolls from RadioShack.
Really though if you wash hands after handling it, and use it in such small hobby scale quantities as most, it won’t matter. The smoke from the burning rosin is probably more dangerous.
Ages ago (80’s I think) there was talk of making lead free solder the only type that was available to consumers, and my great uncle (a deal horder) went out and got 2 cases of radioshack 64/40 resin core. Pretty sure it’s the same stuff you can still buy today, but I’ve got another 4 spools in my kit (that are old enough to drink).
In my uncles defense sometimes his deal hording paid off. He once saved a family reunion when our venue fell through because he happened to have a dozen brand new hibachi grills in the apartment he rented just for his stuff. And he made a small fortune when he bought a bunch of freon before it went off the market.
I finally bought some flux last year and was angry at myself for all the wasted years, proper solder is next on the list but I still have some cheap but usable solder that I want to use up first
I got some cheap solder with my solder station and it was the bane of my existence. Found some leaded solder I think I got from radio shack years ago and it works so well. I hate to say it but I haven’t yet had good success with unleaded solder. Someone please save me from the brain damage.
You might want to check out OpenMV Cam which does some cool machine vision stuff and runs MicroPython.
I would probably start looking at OpenCV software for RasPi if you need more processing power.
I’ve been playing with ESP32 lately. I’m frankly kind of shocked at how well documented the API is and how well it all works. And it’s mostly open. I haven’t done anything with ESP32 Cams I bought, yet. No idea what is possible there or where to start.
Hopefully that helps.
Meanwhile I’m over here trying to wrap up a simple Bluetooth-enabled amp project for the last couple months lol. I should do more with machine vision.
I’ve noticed that outside of the fixed use cases and their combination, it is surprisingly difficult to make ESP32 do something. For example, i wanted to crop and apply simple filters on videos being streamed from an ESP32 Cam. Should be doable for a setup that can do facial recognition and AI stuff, right? Clearly not without writing your own libraries.
PS: to me RPi is overkill for all but the most intense compute requirements. So is the esp32 to a lesser degree. Don’t always need 240MHz dual core RISC with FreeRTOS and 2.4G radio…
I default to Arduino, usually attiny devices for simple, low power stuff. I am really liking the new TinyAVR line. Quicker programming, way more functionality, etc.
askelectronics
Hot
This magazine is from a federated server and may be incomplete. Browse more on the original instance.