I posted to a likely looking maths forum in the hope of finding a tame boffin who speaks the vernacular: http://mymathforum.com/physics/339093-equation-generate-output-driven-rc-circuit.html Meantime, it may be that any solution is going to be complex. If you look at what seems to be simple - the eq...
Tried editing the above but it didn't happen. So ... Better to say that there are two independent variables - time and current - and one dependent variable - the voltage across the capacitor . The current into and out of the cap is determined by the drive voltage applied to the resistor , which alte...
> can be easily solved for some situations like a stead-state Vo or a know frequency. Quite so, but this has two independent variables - time and voltage - and is thus a more complex case than those typically found in textbooks and undergraduate courses. There may well be standard solutions but I ha...
The filter analyses I've seen treat the RC combination as a frequency-dependent network, and thus use the frequency domain as the abscissa rather than time, as I require. The other analyses use a "step" approach. They use starting conditions to plot the v:t curve using the standard exponential funct...
This is more about mathematics and electronics, but I'd like to use Mathematica to generate the graphs I need. It's probably something that others might also find useful. Given: a voltage source Vo with an output of 0V - 5V at a frequency Fclk. One end of a resistor R is connected to Vo, the other e...
I'd like to set up my Rpi as a wifi camera pointing down at my workbench so that my students can see what I'm doing on their laptops. Since this is my first Rpi project, I'm not up to speed with what's out there. Can anyone suggest what cameras are available, what wifi attachments, software for the ...
Raspberry Pi Model B dated 2011, 256MB RAM. New download of PIXEL 2016-09-23. Plugged in a USB wifi dongle. Right-clicking the Network tray icon brings up the preferences dialogue. Set it to Configure - interface - wlan0 with the autoconfig box ticked. No result. Nowhere to put in the PSK. My tablet...
I'm designing a mating board (add-on) for the Rpi and would like to arrange for it to be flush with the top of the highest Rpi component, the USB connector. Given that the height of available sockets varies somewhat, this might take some browsing of data sheets. I'm also including a USB hub on the m...
Yep, and good on the Poms - it's great product. Here in Oz we seldom see anything other than a US kbd, so it's not an issue I've had much experience with - likewise others, I'd guess. I'm putting together an Rpi subsite for my website, so I'm asking a few 'stupid' questions to make sure my assumptio...
Ah, OK, didn't realize that the default was UK, since the kbd default seems to be 105 key which (in my experience) has a hash sign as a shifted three rather than the UK 'L' pound sign. Also, I've never seen any mention of this in the docn, so I assumed the US default as is usual. Thanks; will try ch...
I've just re-installed Rpi Raspbian for the third time (checking things out) and deliberately left the 'locale' setting in 'raspbi-config' untouched (past experience). I'm now trying to install Evolution, and when I enter my email address I get a UK substitute for the @ sign, which makes further pro...
Sorry guys, my mistake. Figured it was, but since I couldn't find any relevant material I thought I'd post it for future reference by others. The problem was in the router (as many of you will have suspected). I'd set up IP-MAC binding for my other machines, and it had been working fine. However, wh...
I've just fired up my new Rpi and am suitably impressed. My ethernet router has assigned it an IP address (192.168.1.103) and ifconfig verifies this. However, I can't ping the router, and of course there's no connection via Midori.
Is there a firewall or other impediment to LAN connection?