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Led Diode Values
Pulse Width Modulation - what value is instrument displaying?
I built PWM module for controling current trough 10W 12V 900mA LED. I put the ampermeter in series with LED diode. When ampermeter is showing 900mA is this the actual current that is passing trough LED or some average value?.
I am wondering this since the LED is driven by current pulses from PWM module. If I increase current further more, the LED will shine more. But since it is rated 900mA perhaps I should not force it over 900mA?
the PWM frequency will affect the reading of almost any ammeter.
you are probably not reading the peak current. find or add some series resistance somewhere; use the scope to measure the peak voltage across same and dervie peak current therefrom.
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LightEmitting Diode $68.51 Light emitting diode. Oleg Losev, List of LED failure modes, Organic light emitting diode, Miniature light emitting diode, Solid state lighting, LED lamp, LED power sources, Electrical polarity of LEDs, LED circuit, LED as light sensor Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 74 Publication Date: 2009/10/08 Language: English Dimensions: 5.98 x 9.01 x 0.17 inches |
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Pacer 12 Diode LED Light $12.95 LED (Light Emitting Diode) lighting gives extra brightness and longer life than conventional bulbs. Pacer's LED Light Kit works well as a third brake or turn signal indicator. It is actually 12 LED lights within 1 larger light. The compact, slimline design allows a great variety of mounting location options. Includes one light. Mounts with two-sided tape Simple two wire installation Long life Low power draw Each light is 4 5/8'' L x 7/16'' W x 3/4'' H. Available in Red, Amber, White and Blue* *White and blue lights are an additional $2.00 |
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Pacer 20 Diode LED Light $15.95 LED (Light Emitting Diode) lighting gives extra brightness and longer life than conventional bulbs. Pacer's LED Light Kit works well when a light with extra length is needed. It is actually 12 LED lights within 1 larger light. The compact, slimline design allows a great variety of mounting location options. Includes one light. Mounts with two-sided tape Simple two wire installation Long life Low power draw Each light is 8'' L x 5/8'' W x 3/4'' H. Available in Red, Amber, White and Blue* *White and blue lights are an additional $6.00 |
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Kuryakyn L.E.D. Turn Signal Diode Kit $7.99 This kit is required when installing L.E.D. lights as turn signals on a motorcycle with a single turn signal indicator light. If this Diode Kit is not installed, power will back feed across the indicator light & all turn signals will flash at once. |
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Kuryakyn Diode Kit $6.76 " This kit is required when installing LED. lights as turn signals on a motorcycle with a single turn signal indicator light If this diode kit is not installed, power will back feed across the indicator light and all turn signals will ff" |
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Savio RAD1000 4W LED Light (17 Diode) $111.15 Enhance the mood of your water garden while highlighting points of interest with an illuminating light display of energy efficient LED lights from Savio. LED lights never get hot to the touch safe for fish and plants Available in two sizes rugged professional housing units are backed by Savio s quality and a oneyear warranty. LED New Technology An excellent way to save money and energy Radiance LED lights can be added as accents in or out of the water. Ideal for waterfalls and semiaquatic environments LED lights emit almost no heat are incredibly energy efficient delivering remarkable brightness and longevity. 4W LED Light (17 Diode). Durable construction. Can be used in or out of water. 20 Cord. |
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Led Slimline Id Light Bar Red 15 3 Diode $19.94 Led Slimline Id Light Bar Red 15" 3 Diode 15" SlimlineA(r) LED I.D. Light Bar Red. Features: Operates 9 16 Volt DC systems 100,000 hours of service life Shock and vibration proof No Corrosion Sealed marker lights Impact resistant polycarbonate housing Energy draw 250 miliamps interchangeable with most manufactures 14.50" mounting centers |
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Values $164.99 Values - Framed Art Print |
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Custom Dynamics Diode Kit $6.99 Use when front turn signal bulbs are replaced with LEDs Designed for metric cruisers with one LED turn signal bulb in each turn signal |
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American Fluorescent DDU28LED-RB Oil Rubbed Bronze Diode 28 Contemporary / Modern Diode 28 LED Under Cabinet Light $98 Diode 28 Under cabinet Light LED lighting is the newest advancement in under cabinet lighting technology. LED lights do not use filaments, making them very reliable with a long life span (50,000+ hours). Uses only 5W of power and generates very little heat. Light output is equivalent to one 13W T5 fluorescent or three 20W line voltage Xenon lamps. No remote power supply needed 28 individual LED s provide low glare on counter surface 300 Lumens Three position illuminated push button switch for full or half light output Extended fixture width allows a wide, even light distribution Slender 3/4 inch profile ABS molded housing and diffuser Plugs directly into 120V outlet, cord included Can be end-to-end connected with direct connector, included Connect up to 20 fixtures Use 12 inch modular connecting cord, included, for multi-fixture daisy-chain connection or use to plug into hardwire box Hardwire connection through optional hardwire box Screw-in or double-sided adhesive mounting 28 5W TOTAL Requires model number XNHB kit for hardwire installations. |
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DIODE $12 When these electrical items fail there is little choice but to renew - With this genuine Suzuki par.. |
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American Flourecent DDU28LEDRB Diode 28Light LED Under Cabinet in Oil Rubbed Bronze $127.4 LED lighting is the newest advancement in undercounter lighting technology. LED lights do not use filaments making them very reliable with a long life span (50 000 hrs). They also use minimal power to operate and give off very low heat. Type LED. Collection: Diode. Finish: Oil Rubbed Bronze. Number of Lights: 28. Plug Included: Yes. Suggested Room Fit: Kitchen. Style: Contemporary / Modern. Bulbs Included. UL Listed. No Remote Power Supply Needed. 28 Individual Led s Provide Low Glare On Counter Surface. 300 Lumens. Three Position Illuminated Push Button Switch For Full Or Half Light Output. Extended Fixture Width Allows A Wide Even Light Distribution. Slender 3/4 Profile. Abs Molded Housing And Diffuser. Plugs Directly Into 120v OuttletCord Included. Can Be End to End Connected With Direct ConnectorIncluded. Connect Up to 20 Fixtures With 12 Modular CordIncluded. Hardwire Connection Through Optional Hardwire Box. Screw In Or Double Sided Tape Adhesive Mounting. 28 5W TOTAL. Requires model number XNHB kit for hardwire installations. Voltage: 120. Installation: Dry Locations. Listing: LED Quick Ship. Width: 6.25 . Length: 9.5 . Height: 0.625 . |
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Aquascape 98452 LED Replacement Bulb Natural White $22.87 Replaceable diodes for Aquascape LED Bullet Spotlights and LED Waterfall Lights. Standard 1Watt. High output LED diode. Color: Natural White. |
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Aquascape 98370 LED Replacement Bulb Red $22.87 Replaceable diodes for Aquascape LED Bullet Spotlights and LED Waterfall Lights. Standard 1Watt. High output LED diode. Color: Red. |
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Led Outdoor Lighting - Why Led Solar Lights
How to make astable multivibrator?
I need astable multivibrator but i don't know how to define the values of the capacitors and resistors I want on one state to be 3 minutes, and on the other 1 minute, and on the emitters of the transistors to wire LED diodes (Red & Green), and use the outputs Q and Q'.
How to define the capacitors C1& C2, resistors R1 & R2 which are wired on the bases of the transistors How much is Ic1 max & Ic2 max for the transistors and how much is Tp1 & Tp2?
Please tell me!
Thanks!!!!
Since we can't see your circuit, it's hard to know what R1/R2 and C1/C2 are connected to exactly.
You might find it a great deal easier to use an LM555 for your timer / astable multivib.
LOTS of sites out there to help you with the component selection.
You're looking for a duty cycle of 75% (or 25%, depending upon which way you look at it) with a total time of 4 minutes (3 + 1).
Positive Time Interval (T1) = 0.693 * (R1+R2) * C
Negative Time Interval (T2) = 0.693 * R2 * C
In round numbers, you can use a 1.0M (goes between pins 7 and 8), 510K (goes between pins 6 and 7) and 180uF (goes between pins 6+2 and ground) to create 3 seconds / 1 second timing. You'll have to trim out the 1.0M a bit (or use 1% resistors to get the values closer) if you want it more precise, but that'll give you about 3 seconds and 1 second.
http://ourworld.compuserve.com/homepages/Bill_Bowden/555.htm
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