Showing posts with label light. Show all posts
Showing posts with label light. Show all posts
Sunday, August 4, 2013
Wiringlight Switch Ceiling Light Project
Telephone Socket Wiring How To Do It.
Thread Wiring Clipsal Saturn Light Switches.
Mesa Whole House Wiring Services Provided By Amadeus Electric.
Multi Room Wiring.
Russell Residence 10007 Meadow Road Sw Lakewood Wa 98499.
Home House Wiring Installation.
250 And 525 Sx Mxc Exc Electrical System And Wiring Diagram Here.
Wiring A Switched Outlet Wiring Diagram Electrical Online.
Wiring A Light Switch For A Ceiling Light Diy Project.
In A Home Equipped With Lexcom Home Wiring Network Cabling System.
Friday, April 12, 2013
Infra Red IR LED Flood Light Circuit Diagram
Infra Red (IR) LED Flood Light Circuit Diagram
The adjoining design shows a simple IR flood light circuit diagram for IR illumination applications.
The 4049 section is the basic voltage doubler circuit which effectively boosts the 9 V supply to a level of around 15 V which further becomes the suypply voltage for the next 555 pulse modulator section.
The voltage is suitably pulsed as per the settings of P1 and P2 for driving the associated IR LEDs.
The main feature of this circuit is that it utilizes just a single PP3 9 volt battery and yet is able to provide lights (IR) at dazzling levels.
Sunday, April 7, 2013
Wiringceiling Light Images Pictures Photos Samples
Wire Up A Light Switch Wire Up A Light Switch 84074 Photocar Org.
Wiring A Light Fixture 1 Wiring A Light Fixture 2 Wiring A Light.
Wiring Ceiling Light Decorative Ceiling Tiles Uk.
Wiring A Switched Outlet Wiring Diagram Power To Receptacle Ajilbab.
Outdoor Low Voltage Halogen Wall Lights Halogen Wall Lights Wdl820.
Outdoor Lighting Wiring Diagram 2 Gang Switch.
Fluorescent Light Fixture Wiring Diagram Submited Images Pic 2 Fly.
Wiring A Ceiling Light Images Best Pictures And Photos Samples Of.
Wiring A Double Light Switch Diagram Electrical Information Blog.
Loft Lighting Diydoctor Org Uk Diy And Home Improvement Forums.
Monday, March 25, 2013
Rear Light After Glow For Bicycles
This article is of interest only to readers whose bicycle lights are powered by a dynamo. The laws on bicycle lights in the United Kingdom are stricter than in other countries and a dynamo is, therefore, a rarity in this country. From the point of view of traffic safety it is advisable (in UK obligatory) for cyclists to have the rear lamp of their bicycle to light even when they are at standstill. In principle, it is not very difficult to modify the existing rear light with afterglow: all this needs is a large enough energy reservoir. Since the after-glow is required for short periods of time only, a battery is not required: a large value capacitor, say, 1 F, is quite sufficient.
As the diagram shows, in the present circuit, the normal rear light bulb is replaced by two series-connected bright LEDs, D2 and D3. These are clearly visible with a current of only 6 mA (compared with 50 mA of the bulb). The current is set with series resistor R1. The LEDs are shunted by the 1 F capacitor, C1. Since the working voltage of this component is only 5.5 V, it is, in spite of its high value, physically small. An effective regulator is needed to limit the dynamo voltage adequately. Normal regulators cannot be used here, since they do not work at low voltages. Moreover, such a device would discharge the capacitor when the cycle is at standstill.
Fortunately, there is a low-drop type that meets the present requirements nicely: the Type LP2950CZ5.0. Of course, the dynamo output voltage needs to be rectified before it can be applied to the regulator. In the present circuit, this is effected by half-wave rectifier D1 and buffer capacitor C2. Diode D1 is a Schottky type to keep any losses low – important for this application, because the ground connection via the bicycle frame usually causes some losses as well. The value of buffer capacitor has been chosen well above requirements to ensure that C1 is charged during the negative half cycles of the dynamo voltage.
[Continue reading]
As the diagram shows, in the present circuit, the normal rear light bulb is replaced by two series-connected bright LEDs, D2 and D3. These are clearly visible with a current of only 6 mA (compared with 50 mA of the bulb). The current is set with series resistor R1. The LEDs are shunted by the 1 F capacitor, C1. Since the working voltage of this component is only 5.5 V, it is, in spite of its high value, physically small. An effective regulator is needed to limit the dynamo voltage adequately. Normal regulators cannot be used here, since they do not work at low voltages. Moreover, such a device would discharge the capacitor when the cycle is at standstill.
Fortunately, there is a low-drop type that meets the present requirements nicely: the Type LP2950CZ5.0. Of course, the dynamo output voltage needs to be rectified before it can be applied to the regulator. In the present circuit, this is effected by half-wave rectifier D1 and buffer capacitor C2. Diode D1 is a Schottky type to keep any losses low – important for this application, because the ground connection via the bicycle frame usually causes some losses as well. The value of buffer capacitor has been chosen well above requirements to ensure that C1 is charged during the negative half cycles of the dynamo voltage.
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