PV by itself is still a ways off because it is not just the cell technology cost to consider. Location, support and protective structures and energy conversion are also issues even if you assume no storage. The electrical grid can be treated as a storage medium, just think of the money...
DLP is a projection technique using micromirrors to steer and focus light for display. Projectors for use with computers in presentations are available now for under a few thousand. A few large movie theaters use the technology instead of film and the picture is quite a bit better than the...
It sounds as if you need a custom implementation of a DLP based rear projection. Depending on size, you may also want to sectionalize to keep the depth under control and maintain sharpness and resolution. Assuming there is some border around the table, the tapered edge you can get from...
The DSLAM does not have to be a bottleneck as it is a head end system presumably located near very fast data links. It is a deployment decision to serve the DSLAM with limited backbone. Cable systems use coax but it is shared with other users as well as TV and FM channels. Multiplexing is done...
It comes from the type of output stage amplifier circuit in the op amp. When polarity changes, one set of drivers switches off and the complement switches on. The design of the op amp determines how well this is done. Any overlap results in a short across the opamp power supplies so instead...
DSL uses two frequency bands above the voice band on the phone line but these signals do not go through the voice switching system. The lower band is for upload data and the upper band is for downsteam. DSL requires a modem, filter, and router at the head end which is usually at the central...
It sound as if you have a ground loop. My guess is that there are unbalanced 3 phase Y circuits or undersized single phase branch circuits dumping current into ground. Do your switches and sensors share a common ground or return? They shouldn't nor should the signal return conductors and signal...
I think I first saw the idea used for data transfer in some data aquisition modules I beleive from Burr-Brown many years ago. I have not seen the technique used anywhere else nor for power but that does not mean it does not already exist. Any mismatch in the driver signals, coupling caps, or...
I did a circuit like this to avoid impulse noise on a digital telephone. I ran a 4046 PLL at a multiple of the primary pulse rate and used the feedback divide counter states to open and close a sampling window to maintain a frequency lock. Errors that made a pulse early or late were limited to...
If your isolation requirement is primarily DC, you can dump the transformer and use a complementary drive to matched caps. On the "secondary" side, use a schottky bridge to get back to DC. This should be good for a few ma. If necessary, use a common mode choke to filter the residuals and...
Most programmable logic chips have security bit that once programmed, the program cannot be read out. These can be defeated but only with great effort and physical destruction of the chip.
ESD travels on surfaces and prefers edges. It really does not matter is have to be a conductor. Almost any continuous surface will block it. One way to use a four layer board is to put the planes on the outer layers and the traces internal. This clearly does not work for surface mounted...
I have done similar things using 1 bit oversampling and some sort of filter. The trick is not the output but the recording of the voice. The technique I have used is to translate .WAV files to the necessary bit stream. This allows for easier recording and editing of a recorded vocabulary. To...
A "brushless" motor will not work. The replacement for brushes used to commutate the armature current are solid state switches designed only to switch current into the motor. The power level and voltage you mention is approximately that of an automotive alternator or generator. The...
I just referenced this circuit for LEDS in another post:
http://www.inventgineering.com/LEDdriver.htm
Use this behind a full wave bridge and cap to feed the LEDS.
The strings of LEDS should be longer than my example circuit but the advantages of this over simple dropping resistors is a constant...
I have an alternate simple circuit to regulate the current to LEDS instead of voltage on my web page:
http://www.inventgineering.com/LEDdriver.htm
The problem with trying to have a fixed voltage is that LEDS are current devices with a more or less constant voltage drop. This voltage changes with...
Begin on page 35 of this link:
http://www.linear-tech.com/pdf/an19fa.pdf
They have several regulators of this type that may have the switch current you need with isolation @ 3%. Note that with 5 volts input and 12 volts out @ 3 amps, the switch current will be quite high. You may want to have a...
Is this a single project or a group of seperate projects? If it is a single project, I suspect there may be other signal connections between the electronics. Using a common power source can cause problems if this is the situation.
One problem that I see very likely in a multiple project...
What many people do not realize is that insulation wears out with time and voltage and is not "water proof". The usual causes of series failure are physical damage from humans, rodents, insects, ice, or ground movement. Water will corrode conductors when current flows through it and...
In telephony, currents are more important for signalling than voltage. Many systems dot not have a direct connection to ground but "float" the feed current (sometimes with a current source). There is a high impedance ground connection to bias the circuit negative. This scheme allows...
