![]() ![]() When the time reaches the stop time, the power supply is turned off, the relay is de-energized, and the +5V connection is opened, turning off the USB devices. When the timer hits the start time, the power supply turns on, the relay is energized, and the +5V line of the USB cable is connected for continuity, allowing the USB devices to power on. Just plug your wall wart into the socket and use the output to power the relay. A simple appliance timer used to turn lights on and off would work. The timer needs to be programmable so you can set the start and stop times. Connect the positive and negative lines from the DC power jack to the Vcc input of the relay and ground, respectively. #Usb switch on off PcYou can mount the chip on a small project board or build your own from scrap PC material. Connect the two ends of the USB +5V line to the input and output of a relay chip. #Usb switch on off installInstall a DC power jack in the project box that's compatible with the connector on the wall wart. Get a wall wart and a DC relay chip that are of compatible operating voltages (i.e., if the relay operates at +5V get a 5VDC wall wart). Insert the cable and grommets through holes at each end of the box and splice the three wires together (everything but the +5V line). Drill three holes in the box: two for grommets and one for a DC power jack. Get a small project box and cut a USB cable somewhere between the connectors. ![]() If all you need is to control it via a timer then it should be a relatively straightforward circuit to build. What are you planning to use as a trigger to either energize or de-energize the USP port? In other words, what type of event would require the port to be toggled on or off? I ran a search and came up with the following: Originally Posted by captain_video /forum/post/21397620 I suspect there may be something related to home automation from a PC that would do what you want. #Usb switch on off how toI'm just not sure how to go about setting that up on a PC. You'd probably need a single output that would toggle between a high or a low as the switching signal. You'd probably need some sort of interface whereby you could program it to send a signal to the external switch and toggle the outputs in the manner I described. Switch back to the same input and the devices are powered back on.Īutomating them would require more expertise than I can provide. When you switch to the open port, the devices connected to the other port should now be disconnected and power off. However, some drives seem to deal better with imbalanced discs because of clamping / damping mechanisms.What are you planning to use as a trigger to either energize or de-energize the USP port? In other words, what type of event would require the port to be toggled on or off? I ran a search and came up with the following:Ī simple 2-way USB switch could be used whereby one output connects to the devices you wish to power on and off and the other input is left open. The imbalance of discs is random and uncontrollable. Some discs are less balanced and cause more wobbling and vibrations, which in turn, lead to more noise. I found the following info online, but don't really know if this could be causing the issue: Most other DVD's, also borrowed from him, play fine with absolutely quiet operation from the drive, it's sort of random whether the noise will happen or not. These DVDs are ones I borrow from a friend, not sure if it something caused by some player he's previously played them on or what. And these are commercially produced factory quality DVDs, not irregular in any particular way. ![]() The DVDs that cause this sound play through okay, but obviously there shouldn't be this loud sound I describe coming from the drive. The sound generally seems to speed up (get louder) and then slow down (get softer) as I'm doing things such as switching to various menu places on the DVD. Often, depending on the DVD it seems, when I pop one into my laptop I hear a loud whirring like vibration humming noise coming from the optical drive as the DVD is spinning. ![]()
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