Important: Use custom search function to get better results from our thousands of pages

Use " " for compulsory search eg:"electronics seminar" , use -" " for filter something eg: "electronics seminar" -"/tag/" (used for exclude results from tag pages)


 
 
Thread Rating:
  • 0 Votes - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
ppt on automatic low power emergency light
Post: #1

i want automattic low power emergency light
Post: #2
to get information about the topic "automatic low power emergency light" full report ppt and related topic refer the link bellow

http://project-seminars.com/Thread-autom...ull-report
Post: #3
AUTOMATIC LOW-POWER EMERGENCY LIGHT


.pdf  AUTOMATIC LOW-POWER.pdf (Size: 115.58 KB / Downloads: 102)

Here is a white-LED-based
emergency light that offers
the following advantages:
1. It is highly bright due to the use
of white LEDs.
2. The light turns on automatically
when mains supply fails, and turns off
when mains power resumes.
3. It has its own battery charger.
When the battery is fully charged,
charging stops automatically.
The circuit comprises two sections:
charger power supply and LED driver.
The charger power supply section is
built around 3-terminal adjustable
regulator IC LM317 (IC1), while the
LED driver section is built around
transistor BD140 (T2).
In the charger power supply section,
input AC mains is stepped down
by transformer X1 to deliver 9V, 500
mA to the bridge rectifier, which comprises
diodes D1 through D4. Filter
capacitor C1 eliminates ripples. Unregulated
DC voltage is fed to input
pin 3 of IC1 and provides charging
current through diode D5 and limiting
resistor R16. By adjusting preset
VR1, the output voltage can be adjusted
to deliver the required charging
current.
When the battery gets charged to
6.8V, zener diode ZD1 conducts and
charging current from regulator IC1
finds a path through transistor T1 to
ground and it stops charging of the
battery.
The LED driver section uses a total
of twelve 10mm white LEDs. All
the LEDs are connected in parallel
with a 100-ohm resistor in series with
each. The common-anode junction of
all the twelve LEDs is connected to
the collector of pnp transistor T2 and
the emitter of transistor T2 is directly
connected to the positive terminal of
6V battery. The unregulated DC voltage,
produced at the cathode junction
of diodes D1 and D3, is fed to
the base of transistor T2 through a 1-
kilo-ohm resistor.
 

Marked Categories : automatic low power emergency light circuit diagram, automatic low power emergency light application abstract pdf, ppt on automatic lowpower emergency light, aoutomatic low power emergency light, ppt on emergency light, threads of automatic low power emergency light, low power emergency light, ppt emergency light project, emergencylight ppt, emergency light ppt, light information for ppt, automatic low power emergency light abstract, automatic low power emergency light reference, ppt on automatic low power emergency light, automatic low power emergency light project report, automatic low power emergency light ppt, automatic low power emergency light,

[-]
Quick Reply
Message
Type your reply to this message here.

Image Verification
Image Verification
(case insensitive)
Please enter the text within the image on the left in to the text box below. This process is used to prevent automated posts.

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  smart shock absorber for automobile ppt Guest 1 0 Today 02:58 PM
Last Post: jaseela123
  ppt on hr practices in bajaj auto ltd Guest 1 162 Today 02:39 PM
Last Post: jaseela123
  ppt on sparsh technology Guest 1 141 Today 02:37 PM
Last Post: jaseela123
Wink hp java technical seminar and also ppt Guest 1 207 Today 02:22 PM
Last Post: jaseela123
  real life applications of soft computing ppt Guest 1 236 Today 02:19 PM
Last Post: jaseela123
  seesaw power generator Guest 1 187 Today 01:18 PM
Last Post: jaseela123
Question ppt for mining web graphs for recommendations Guest 4 2,421 Today 10:32 AM
Last Post: madhuchandran hk
  ppt of digital image processing by nptel Guest 1 207 Yesterday 05:00 PM
Last Post: jaseela123
  auto switch off staircase light diagrams Guest 1 188 Yesterday 04:41 PM
Last Post: jaseela123
  a gps based debris removal system ppt Guest 1 153 Yesterday 04:38 PM
Last Post: jaseela123
This Page May Contain What is ppt on automatic low power emergency light And Latest Information/News About ppt on automatic low power emergency light,If Not ...Use Search to get more info about ppt on automatic low power emergency light Or Ask Here

Options: