If you want to know how many 100 watt lights are turned on (without caring about actual watts) you could use a part like LM3914. You would need a circuit that rectifies AC to DC and possibly amplifies/divides it so the DC iutput to the LM3914 drives one output per 100 watt lamp.
I needed -12 volts @ 2.1 amps for three synchro-to-digital and digital-to-RVDT cards at work (avionics electronics lab stuff you don't see with most other off the shelf PCI cards) so I came up with the DC-DC converter solution.
The isolated DC-DC converter allows powering the input with any...
No way to do it without very extensive mods to the PSU. But I had a PC at work that needed -12V @ 2 amps for some PCI boards that were installed.
I bought a 12 volt 30 watt DC-DC converter with isolated (important) output. I wired the inputs to the PSU +12 volt output, and the + output to PSU...
It works and is safe to do so long as those are the only connections between the two PSUs. As matrix563 posted, adapters are available to avoid cutting into the PSU cables. Or if you are comfortable with doing so, you get to keep $5-$10.
A disadvantage of using a toggle switch is you would...
One way is to remove the toggle switch on the stereo PSU. Then splice the green wire on the stereo PSU to the green wire from the PC. And splice the black wire on the stereo PSU to a black wire on the PC.
The power button on the PC will turn them both on and off.
Have a look at sime LCD panel controller cards here: http://www.digitalview.com/controllers/products.php/
Here is a connection diagram for one of them to your LCD panel model:
Electrical engineer here. You appear to have a flat panel display that has 6 bit red, green, and blue data inputs and horizontal and vertical sync. I am guessing you want to interface it to a VGA or DVI card in a PC?. Without the hardware and firmware that goes in between, it wont work.
You could use a power monitoring meter such as the ones shown here: http://electroindustries.com/products_page.html I am using the Nexus 1250 f to monitor 115VAC 400Hz power usage for a project at work.
But you are looking at $2000 to $4000.:eek:
I didn't get it wrong at all. While the AC frequency for power coming out of the wall is 60Hz, the sound produced by a transformer plugged into it has a fundamental frequency of 120Hz.
BTW i'm an electrical engineer too.
Another possibility (since it is a high pitched whine) is that the adapter may contain a regulated switching power supply. If that is the case, the whine will be several kilohertz, not 120 hertz. I know some adapters for Linksys ethernet switches contain 3.3VDC supplies.
Looking at the four pads for the switch on the back side (your second picture), two pins are bridged together on the left, and two are bridged together on the right. Therefore, the switch functions as a SPST.
Many people hide wires behind the MOBO tray; except that doesn't work if your MOBO tray is not removable and the right side cover is not removable either. Also, if your PSU is at the bottom of the case (think ANTEC 900), that is a special problem.
Figure out in advance how many of the power...
I can't say what resistor without knowing the voltage source. But you can calculate it:
Resistor = (sourcevoltage - 3.4)/.020.
The result is in ohms. Choose the closest resistor value that is equal or higher.
For example, if your source is 5V:
(5-3.4)/.020 = 80. So 82 ohms is close.
digikey.com and mouser.com are good sources for DC-DC converters. You'll want one that has an input voltage range that your PC can supply (typically rated 9V-18V), and has an output current rating suitable for what you are going to power (it's best to have some headroom... it you need 1 amp, buy...
Another option which I have sucessfully used is a 12V DC-DC converter with an isolated output, powered from PSU 12VDC. If you need 24VDC (referenced to ground) connect the negative voltage output to your PSU +12VDC, and your load between PSU ground and the DC-DC converter positive output.
Mods should rename this thread "ESD: Truths, myths, flat out lies, and bullsh*t". If I were a person looking for accurate information regarding ESD I would become completely confused by the variety here.
LAN connections between computers would probably have no problems (but I don't know what your network traffic looks like). But if too many tried to use the WAN connection to access the internet at once then you could have problems.
Depends on what you need to do. You could connect 16 more switches and have a total of 256 ports. But if your WAN connection to the first switch is to a 1Mbps DSL modem you are going to have quality of service issues.
I am designing a test system that has three 8-bit ethernet microcontrollers http://www.rabbitsemiconductor.com/products/rcm4200 connected through FPGAs to some non-standard serial buses transmitting and receiving 16-bit serial data at 1Mbps clock, at some data rate (maybe up to 500 messages/sec...
Policy where I work is not to wear ESD protection when working on anything that is powered. Most of our equipment is 28VDC and 115VAC 400Hz. And believe it or not kids, 28VDC bites if you touch it and are well enough grounded.