It's now back on line. Still processing HD, but it has finished medium quality processing, so is now good enough to at least watch.
It's now back on line. Still processing HD, but it has finished medium quality processing, so is now good enough to at least watch.
when i did an A level course in electronics in Italy that taught nothing the state exam consisted of calculating the gain of a differential op amp configuration and the output given the input. Even with being able to use the electronics manual which covered everything from the basics of electrical current to anything but microcontrolers they could not even find the right page in the book and find the two simple sums to do (calling a gain calculation an equation is almost an insult to real maths). naturally being Italy 3 of us took a row at a time and handed out the solutions whilst our "professors" kept the external examiner board president busy in the school bar (who I'm sure knew what was going on)
Hi Dave,
I was just wondering, have you concerned some active current measurement?
I think there must be some way to actively control the voltage over the shunt resistor to 0 and measure the injected current.
Of course, you meet your own required specs also using this passive current shunt, but I was just wondering if you have concerned it and figured out what other challenges it would bring.
edit: I found one here: http://zone.ni.com/devzone/cda/tut/p/id/5448
Also, is your way of making a dual power supply not just dissipating the equivalent amount of power of the rail that is not in use, effectively doubling the power consumption compared to the switching one?
Thanks for this nice video!
Tom
PS: We already had the scientific calculator watch, and now the uCurrent, what's next?
I was just wondering, have you concerned some active current measurement?
I think there must be some way to actively control the voltage over the shunt resistor to 0 and measure the injected current.
Of course, you meet your own required specs also using this passive current shunt, but I was just wondering if you have concerned it and figured out what other challenges it would bring.
edit: I found one here: http://zone.ni.com/devzone/cda/tut/p/id/5448
Also, is your way of making a dual power supply not just dissipating the equivalent amount of power of the rail that is not in use, effectively doubling the power consumption compared to the switching one?
PS: We already had the scientific calculator watch, and now the uCurrent, what's next?
I watched it yesterday on 360p and it was not that bad. I also managed to survive the 51 minutes length... not even 1 minute wasted!
Ya, how long is the delay between posting it on YouTube and it being available on your RSS feed and iTunes?
Also, is your way of making a dual power supply not just dissipating the equivalent amount of power of the rail that is not in use, effectively doubling the power consumption compared to the switching one?
Not really. The 200K resistance used takes only 15uA + 130uA for the opamp. Low enough for this app.
A 7660 switched cap inverter is going to take a similar amount of active current, and it adds noise and extra cost.
I'm not sure how anyone could watch it in that horrible pre-processed quality!