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laptop charger battery circuit
Yes, provided you can either A find manufacturers details or B trace the path from adapter to battery and ID the components you could build a freestanding battery charger.
It might be simpler to contact your manufacturer and see about repair/replacement...
Re: is it a buffer?!
An Op AMP works day and night to drive Verror to zero. As such the OP amp as pictured will not make an effective buffer .
Recall that the inputs to an Ideal Op AMP have infinite impedance. As such 100% of your current flow will leach through your unlabeled resistor to...
microcontroller tic tac toe
A microcontroller, FPGA, or even discrete logic can be set up to solve your problem.
First think about the rules and what types of ins and outs your system needs.
For a very basic version:
I invision a 9 bi-color LED grid to represent the moves and indicate which...
The concept behind a solid state nonvolatile memory system is pretty simple. You must store data in an array of solid state components and maintain that sata even when power is removed. How stuff works has a good beginers primer on the technology at...
The biggest advantage comes from needing less wattmeters, and introduce less meter loading on your circuit (because as you know ANY meter will load the system to some degree)
The main disadvantage, the 2 meter system only works on 3wire systems, a 4wire system requires 3 meters.
For more info...
You could implement a very simple AC-DC system with a handful of diodes and a capacitor or two. It would convert XVolts RMS AC to X Volts DC. Most applications for AC-DC converters are from line voltage to a device that needs substantially less than line voltage.
If I try to use a resistor to...
By its very nature an AM signal is much more susceptible to noise than an FM signal. I've never heard the term threshold effect used in an AM system, and I believe that the SNR of an AM signal remains linear across all possible values. There is no hard threshold below which the performance...
Motorola has the capability to fab with GaAs and Silicon The hybrid chips cost about 1/10 of what straigt GaAs would run, though I don't have exact numbers. Other suppliers of GaAs based chips can be found here hxxp://www.thomasnet.com/products/amplifiers-gallium-arsenide-fet-1570969-1.html
Re: formulas for FDM!
The bandwidth required for a FDM system varies from that in a TDM system in several regards. In TDM you can calculate the total bandwidth used with a simple equation as you state in your question. For FDM the total bandwidth is usually channel specific and will be...
What kind of phone are you interested in? Some specific model, or just a cell phone in general. Typically the battery is charged like any other battery. The phones microcontroller monitors the charging process to prevent overcharging and basically put the power adapter feeds a constant...
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