Yes, the hybrids are a feel good measure. The small amount of gas saved is eaten up in the extra cost of buying and maintaining all the hybrid technology. Hydrogen cars are the same as there is a net energy loss in creating the hydrogen from fossil fuels or water. And it leaks from almost...
The National LM34 outputs 10mV per degree F. 210° = 2.1V output. The LM35 gives 10mV per degree C. Both will work to 210 °F. I have used these to monitor block temperaure at various points in my engine.
Just feed the output to an appropriately scales analog meter movement. Or a Digital meter if...
CNNFN.com had a story about the Prius and the savings. Turns out gas has to be $9.20 a gallon for the life of the car to make you come out ahead. $5.60 a gallon for the Escape Hybrid.
Myself, by driving sanely and using cruise control on the highway, I always beat the EPA mileage by 20% or...
More simply put, if the voltage from the source was the same as the battery voltage, the battery wouldot charge. You nead a "head". That is, a difference in voltage level to get current to flow from the charger to the battery. I know there is a lot more to it than this but this covers the basic...
Unless the frequency is absolutely identical, there will be phase drift over time which will cause all sorts of grief. I miche consider using a PLL syncing off the AC line to contreol the inverter. Then, when the AC line goes away for a short time, the frequency of the inverter should only drift...
You need an AGC and a class E??? power amp of 50W per channel? Do you mean class D? How many channels? B&O ICEPower division is coming out with a 2 X 150W module with an OEM price of $14.00, It can do less power too. They will also have a 6 channel version for $38.00. The switching 120/240V...
Led brightness changes with current but not linearly. are you sure you need regulated power at all? Why not just run the LEDS with their resistor off the raw voltage and be done with it. The variation between 12.5V and 14.5V is not all that great per centage wise anyway. However dropping 12.5V...
You have not indicated how well regulated the output must be. Is unregulated power OK or do you need 0.1% regukation or something in between. The poorer the regukation, the lower the price.
The other point is that this sort of thing is at the very basic end of one's technical education and if...
Before you start, how much power do you need and what kind of quality? No sense learning about everything about amps when all you need is 1 watt to drive a small speaker for a communications receiver.
Or do you need true high fidelity? Again. Reasonable or full blown audiophile.
Up to 60...
Yes, you need shorter pulses for lower brightness levels. If you add filtering, you screw this up. SInce LEDs turn on and off in sub microsecond times, true PWM controlis possible if you use no analog filtering. The more steps you have, the finer your control will be. 32 steps are too few and...
LEDs are indeed square law devices and if you control them in a linear manner, by varying the current through them, you will indeed have a highly non-linear brightness vs. current effect. This will happen if you try to filter the PWM. However, the idea with PWM is that the LEDS are run at only...
Have we lost our nerve that much? Space travel is risky business but there is no shortage of highly skilled and motivated people willing to try. The shuttle has a loss rate of about 1 vehicle per 50 missions. This is a lot better odds than our WWII bomber crews faced in 1943.
The loss rate...
