Tuesday, August 30, 2011

3 phase current and home connections

1.3 phase into apartment has 3 hot wires and optional 4th neutral
2.apartment though getting 3 phase,house will use only one phase at a time OR one room one phase etc
3.3 phase equipment has seperate wall outlet than 2 phase
4.leakage current?? earthing pin
5.hot wires end up in main panel,it goes to subpanel of apartment block then it goes to
panel of (generator) comes back to subpanel of apartment block and comes into subpanel of
flat
6.circuit breakers are there bw main supply and main panel,main panel to subpanel1 ,subpanel 2 to
subpanel 1,subpanel 1 to flat panel
7.from flat panel parallel wire pair ,from hot and neutral run to rooms
8.max an apartment can consume 150 A, 2220v 3phase
9.max building can consume is

--->main-->block subpanel-->phase changeover-->meter-->generator subpanel--->source changeover-->
block subpanel-->flat subpanel-->room outlets
10.http://www.inspectapedia.com/electric/ElecAmps.htm
11.http://wiki.answers.com/Q/How_many_amps_are_in_a_breaker_panel
12.60 apartment flat may have 5000 amp,each flat using 200amp, 1/10 amp can be fatal to human
13.http://en.wikipedia.org/wiki/Industrial_and_multiphase_power_plugs_and_sockets
14.http://www.macfarlanegenerators.com.au/power-calculator.php#kvatoamp

Saturday, May 28, 2011

xrdp can use local sound and remote display

1.restart

running script in bgnd

1.nohup ./dssvlc_norm.sh > $HOME/test_norm.log 2>&1 &

DSS,vlc,playlist

1.can create vlc playlist as .m3u,html etc
2.vlc can take .m3u as arg
3.playlist can repeat , --repeat
4.DSS and vlc can create sdp at /usr/local/movies
5.dss has default streamer
6.vlc can be used as streamer for DSS
7.remote systems will search for sdp in /usr/local/movies in case of vlc and default streamer
8.vlc can additionally transcode on fly for mobile
9.use http://file2hd.com for mp4 download, needs to be in same tab
10.

Friday, May 27, 2011

getting xrdp work

1.install xrdp from source .. also X11rdp needs to be installed and linked with the other
2.only works with mstsc client

multimedia stack in linux

1.install gfx driver in the system , for eg nvidia
2.configure v4l2 it has driver and user components
3.configure alsa it has driver and user
4.configure gstreamer on top of v4l2
5.configure pulse audio, it has driver and user??
6.where does x server come into picture??? the gfx stack binds to x server, x has user component
7.x would talk with v4l2,gfx driver,hw
8.for remote x , ie xrdp, x talk with a remote display nwtworking module that would talk over nw

getting hdmi working

1.get the nvidia driver installed ie download source of appropriate nvidia driver,kernel headers etc compile it and install it
2.after installation of alsa suite and pulse audio suite , check the alsamixer and pulse mixer and check if all are unmute
3.while updating keep all your configuration files as it is
4.use speakertest and aplay mplay for ur testing
5.