Electrical Engineering

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JRE

6:15 AM

I don't use gmail. And yes, the addresses @asmyldof.com (I sent it to two.)

Have to check my mail server, see if it is having problems.

2 hours later…

PlasmaHH

8:43 AM

so if anyone collects tektronix scopes... ebay.de/itm/302233475045

PlasmaHH

9:39 AM

oh and surely relevant to ee.se :

Exploding Batteries in Slow Motion - The Slow Mo Guys

►

1 hour later…

Zeta.Investigator

10:53 AM

@PlasmaHH The safety hole of AA lithium batteries is a good idea. They have a nice backyard :D

Eggi

11:08 AM

Hi there.
I am searching for some spectrum analyzer recommendations.
I am going to measure E & H fields at industry machines and want to analyze some printed boards, which operate at 1Mhz to 100Mhz.
I build my own H antenna and measured something at 20-50 Mhz, so i guess when i use an analyzer which operates in a range from 9kHz to 9Ghz it should be enough?
What can you recommend?

PlasmaHH

none, since nobody ever wanted to give me an SA for free :/

2 hours later…

Asmyldof

1:16 PM

@PlasmaHH @JRE your packages have been deposited

1 hour later…

JRE

2:38 PM

Cool. I'll be watching for it.

h_uat

3:04 PM

hey there :)

does anyone here has an idea about stepper motor control?

i have a small question ;)

Extrarius

3:18 PM

@h_uat ask, and if anybody knows, they'll answer

h_uat

3:39 PM

I have an Arduino and want to create a PWM signal

The frequency of the arduinos PWM is kind of fixed and can only be manipulated in this way:

arduino.cc/en/Tutorial/SecretsOfArduinoPWM

is there any chip which is capable of providing a frequency between 100 and 3000 Hz depending on an i2c input?

or voltage level

I will buy the person answering this question a couple of beers via paypal ;)

1 hour later…

Extrarius

4:44 PM

Many of Microchip's PIC microcontrollers support more versatile PWM and I2C, and can be bought in a DIP package for breadboarding / hand soldering

What voltage does your arduino system run at? I'll find a specific PIC to suggest

Asmyldof

@JRE Your inbox should have tracking information and updates, so the package shouldn't surprise you too much

@h_uat @Extrarius The chip on the Arduino is an Atmel, which can easily do 8bit PWM up to tens of kHz

It's the Arduino Libraries that are bloaty and wasteful

With just C code you can have the Atmel do anything between 1Hz and 10kHz

Extrarius

@Asmyldof Perhaps, but something like the dsPIC33EV32GM002 microchip.com/wwwproducts/en/dsPIC33EV32GM002 can do much higher frequency with many more options without loading the cpu much

2 hours later…

Asmyldof

7:22 PM

@Extrarius How is Hardware PWM loading the CPU, exactly? It's not really good practise to keep throwing processors, especially different families, at a problem, just because the library is shit.

In fact several Arduino's have pretty high end Atmels, which aren't that far off from the PWM performance of that one

And if you're going separate chip, you can get PWM and PPM at 50+MHz. Which the OP doesn't need, as 3000Hz is the highest specified number, which even the stupidest ATTiny can do