262 Threads found on edaboard.com: Power Led Power Supply
I powered it from 1st MCLR pin, put 8mhz oscillator with capacitors into 13th and 14th pin, connected led to 19th pin and led is not blinking.
??? MCLR/VPP is not the power pin. Must supply VDD pins 11 and 32. Please show your complete circuit.
To simplify the test (...)
Microcontrollers :: 03-17-2017 10:55 :: FvM :: Replies: 13 :: Views: 1432
Is "Direct drive led" more efficient than using a switch mode led driver?
Strictly electrically speaking, No. SMPS are to this day the most efficient because the main principle of operation is timed controlled On Off as a mean of determining how much power goes to the load. In between the voltage source and (...)
Elementary Electronic Questions :: 02-17-2017 01:51 :: FredCailloux :: Replies: 9 :: Views: 878
Presently, you have shorted 555 out to 9V power supply and trigger input to ground. So yes, I won't work as is.
Perhaps you try a slight modification
Hobby Circuits and Small Projects Problems :: 02-07-2017 13:28 :: FvM :: Replies: 9 :: Views: 536
I'm making kind of a project right now. But, i've got a problem with choosing a power supply. I need three times 7.5A continuous current. Will I be able to use a 650W PC power supply for this project or do I have to buy a different one? Here's a link to my (...)
Hobby Circuits and Small Projects Problems :: 12-02-2016 20:21 :: dan007255 :: Replies: 1 :: Views: 629
I get errors everytime I simulate my circuit in proteus.
heres my proteus file.
The circuit works fine when the load is just redsistor but when I add a led it goes craxy.
Whst should I do anout these errors?
Hobby Circuits and Small Projects Problems :: 12-01-2016 16:09 :: paulmdrdo :: Replies: 5 :: Views: 1178
is 1k is suitbale for pullup operation..?
Pullup operation for what ?
To drive a minimum idle current to some power device (e.g led ) ?
To set a default state to a high impedance input (e.g MOS logic gate ) ?
Microcontrollers :: 11-17-2016 10:53 :: andre_teprom :: Replies: 15 :: Views: 742
The arduino does not power the leds, instead the arduino simply feeds low current signals to the led drivers inside each led. The led drivers use 18mA for each color in each led.
Each ring has its own +5V and 0V terminals to power it.
Elementary Electronic Questions :: 10-13-2016 13:43 :: Audioguru :: Replies: 6 :: Views: 533
If one or more batteries drops the voltage over 7 volts, power adapter input will take that outlet over
The easy way to do this is to install one 9 V supply, connect it through an led to each battery. The supply is idle until one of the batteries drops to 7.3 V. Then the supply starts to (...)
Professional Hardware and Electronics Design :: 09-02-2016 02:30 :: BradtheRad :: Replies: 23 :: Views: 2581
Maybe you are referring to a capacitive dropper supply? This is often used in cheap low power led mains operated lamps.
Analog Circuit Design :: 07-31-2016 19:41 :: E-design :: Replies: 3 :: Views: 745
The circuit is one way to make a blocking oscillator. A capacitor is not needed. The 1k base resistor reduces the base current to a low amount so it can work from a 1.5V battery. If a 5V power supply is used then the resistor value must be increased 5V/1.5V= 3.33 times to prevent burning out the transistor.
Learn about the turns ratio of a (...)
Hobby Circuits and Small Projects Problems :: 07-28-2016 03:54 :: Audioguru :: Replies: 14 :: Views: 1492
Any regular power supply with 110-250V range will handle this.
Analog Circuit Design :: 07-25-2016 13:16 :: Easyrider83 :: Replies: 6 :: Views: 419
Agreed, and the +5V connection to the ULN2823 isn't needed but a ground connection to pin 9 absolutely is. Pin 9 is NOT a power supply connection, that device does not need any internal power, strictly speaking is the current output pin.
For more brightness your best approach is to use a driver (...)
Show your DIY :: 07-25-2016 08:42 :: betwixt :: Replies: 21 :: Views: 3391
I want equivalent MOSFET for 60R360p ,it is used in samsung led 32 inch tv.the power supply board MOSFET failure by lighting . i am from kerala ,in my area 60R360p is not available
datasheet link -
Service Manuals, Requests, Repair Tips :: 06-29-2016 17:20 :: thannara123 :: Replies: 0 :: Views: 1921
You forgot to tell us how much current you need for the leds. The Texas Instruments datasheet for the CD4017 shows that it can typically supply an output current of 15mA into a 2V red led with a 9V or more supply if you limit the power dissipation of each output transistor to below 100mW. (...)
Hobby Circuits and Small Projects Problems :: 05-13-2016 12:55 :: Audioguru :: Replies: 1 :: Views: 424
I'm trying to design a driver for a led.
i had found this schematic: can anybody helps me to undrstand this
input 230, led (6W).
Professional Hardware and Electronics Design :: 05-06-2016 22:32 :: abdoo :: Replies: 5 :: Views: 968
If someone can help with this problem. I have dc power supply that powers led. Output is 48V when leds are turned on and current is 800mA. I want to measure the current so I can know if leds are working or not.
If leds are (...)
Analog Circuit Design :: 04-29-2016 00:31 :: cipi-cips :: Replies: 10 :: Views: 897
So it is not just an antenna, it is energy saving led power supply circuit. L1 is an antenna to pick up energy from 5.8 GHz radio sources. Efficiency of this antenna will be maximized when it is resonant at operating frequency. Also it's aperture should be maximized. How do you know it is specifically designed for 5.8GHz? (...)
RF, Microwave, Antennas and Optics :: 03-20-2016 17:57 :: AndreyG :: Replies: 7 :: Views: 967
i need a 12v 500ma regulated dc power input will vary from 100-440v ac. how can i do this please give any idea
Power Electronics :: 03-06-2016 17:20 :: raman00084 :: Replies: 10 :: Views: 826
Does it give an error message? Does it beep a certain number of times? Do you see an led indicating hard disk activity?
If not then your computer is failing before it does power On startup test (POST). Could be a problem in power supply, motherboard, RAM.
Can you measure voltage at any (...)
General Computer :: 12-23-2015 17:54 :: BradtheRad :: Replies: 1 :: Views: 1053
Is mains AC the power source? Perhaps you are thinking about a capacitive drop supply? It's popular and economical if you wish to light led's. However if you connect it to batteries, you must add safeguards against overcharging.
In fact, it can be considered dangerous due to the many paths for something to go wrong. I doubt (...)
Elementary Electronic Questions :: 11-28-2015 06:17 :: BradtheRad :: Replies: 1 :: Views: 472
Parallel port has >50kB/s bandwidth easily.
Your design requires a refresh rate spec and allowed latency, supply power source and led Vf @If specs.
If 0.5ms is allowed then refresh rate is 2kHz then parallel rate is 25kHz x8bit /
Serial encoder/decoder would require 100 x 2kHz rate. If you need to latch the (...)
PC Programming and Interfacing :: 11-27-2015 19:18 :: SunnySkyguy :: Replies: 7 :: Views: 918
It is easy to power the LM358 because it works with a power supply that is from 3V to 32V.
You do not need a "virtual ground", instead you bias the (+) input to half the supply voltage with two or three resistors and maybe a filter capacitor. Then the input, output and feedback to ground (...)
Analog Circuit Design :: 10-05-2015 03:30 :: Audioguru :: Replies: 8 :: Views: 1336
Hi, I'm having trouble finding a simple answer.
Can a boost regulator be connected in series to a buck regulator?
Reason being, I have a small 12v dc solar/battery/regulator supply. Discharge/recharge means the voltage shifts from 11v - 16v.
I wish to power a 14v 2.3amp led monitor, so neither a buck or boost al
Power Electronics :: 09-11-2015 21:04 :: SunnySkyguy :: Replies: 16 :: Views: 899
it just work the same as the previous one.
In my test that rev.2 version is work as - when power supply is on the Q1 is in off state, relay off, all led off. First pressing the on/off button actuate 30 min countdown and also power led and 30min led, in this (...)
Microcontrollers :: 08-21-2015 16:59 :: DeepOne :: Replies: 26 :: Views: 2075
approx. 90 " of a 5m reel at 50 leds/m will require a typical Car battery of 40Ah to power 2.3m or 160leds at ~120mA per string of 3 or 6.3A for 6 hours.
Cheap, simple but heavy.
What are the R values per string and how many per string of 3 leds?
Hobby Circuits and Small Projects Problems :: 08-16-2015 04:02 :: SunnySkyguy :: Replies: 4 :: Views: 753
Put a 3V bulb or a white led or an appropriate resistor between the 15 volt power supply and the relay coil.
The COM pin probably has the better thermal conductivity to the relay coil.
Analog Circuit Design :: 07-25-2015 12:35 :: erikl :: Replies: 1 :: Views: 686
Each output of an LM3915 is an open collector that sinks a regulated current when it has an led or resistor as a load connected to the positive power supply. If an output does not have a load then the output does nothing and does not need to be connected to ground.
Analog Circuit Design :: 06-21-2015 00:12 :: Audioguru :: Replies: 3 :: Views: 401
Hello, We have designed a led luminaire with excellent cooling, so it will last for 20 years or more. We need a power supply (smps) for it which will also last 20 years, (in use 8 hours a day, 7 days a week, 52 weeks of each year).
The PSU needs to have a 60V output, as the luminaire takes in 60VDC and gives constant (...)
Elementary Electronic Questions :: 05-15-2015 20:51 :: treez :: Replies: 4 :: Views: 622
could I hook it up to my bench power supply and slowly turn up voltage and current to see how it performs
You will surely burn the component to see that exceeded some specification, especially if it is not effectively connected to a sink. Semiconductor components as this do not have a body mass that absorbs he
Hobby Circuits and Small Projects Problems :: 04-07-2015 19:53 :: andre_teprom :: Replies: 7 :: Views: 1196
I am using 2 watt led and I will use around 30 led for the light so how much power supply do I need?
I don't know any led component which operates with so high power. I suspect you're referring to an assembled array. Whatever the (...)
Elementary Electronic Questions :: 04-07-2015 11:28 :: andre_teprom :: Replies: 4 :: Views: 620
"Dimmable" led power supplies are expected to work with regular triac dimmers. The led brightness should be independent of AC input voltage, the power supply is sensing the dimmer phase angle. No idea how good it works, just try.
Power Electronics :: 04-02-2015 14:52 :: FvM :: Replies: 9 :: Views: 1001
I'm working on the ground layout for an audio circuit. The bandwidth of this circuit is limited to 2400Hz.
The device is powered from a single AA battery, the U5 boost converter is used to provide +5V for both the Op amps etc. as well as the U4 boost converter constant current source. U4 is actually providing constant current for 5 of these circ
Analog Circuit Design :: 02-27-2015 11:51 :: Jester :: Replies: 11 :: Views: 961
I have a cheap flashlight with 24 leds all in parallel. Its battery voltage is higher than the led voltage. Why don't the leds have current runaway and burn out? Probably for the same reason as the fairy lights:
The battery or power supply has an internal resistance that limits the current. (...)
Elementary Electronic Questions :: 02-26-2015 17:03 :: Audioguru :: Replies: 1 :: Views: 384
thank you for your response i missed your answer,since am powering it from 24v (two 12v,7 ah in series), i have to regulate it to 12v am i right otherwise high voltage will burn the led, if i use 12v 7 ah single battery if battery drops to 10 the panel will not work since each sub module ( series of 4 led require 4 v to ope
Power Electronics :: 03-18-2015 06:55 :: SunnySkyguy :: Replies: 20 :: Views: 1717
If the leds are in series and use 48V at 1A then a transistor cannot be used because it will need 100mA at its base to fully saturate. The Arduino can supply only 25mA.
Use a logic-level Mosfet to switch the power supply to the leds modulated by the PWM.
Hobby Circuits and Small Projects Problems :: 02-14-2015 03:31 :: Audioguru :: Replies: 2 :: Views: 550
Is your breadboard power supply module (5V and 3.3V) from iTead or seeedstudio ? I have a similar red board from
Show your DIY :: 02-12-2015 11:14 :: milan.rajik :: Replies: 2 :: Views: 703
Shenzhen Hongda Shun Technology Development Co. Ltd
Established in 2004, our company is a specialized hi-tech company, manufacturing all types of adapters used in various Notebooks and LCD Monitors, Universal Laptop AC Adapters, Universal AC/DC Car Chargers & Tablet pc charger as well as led power supply. Since our establi
Business, Promotions, Advertising :: 02-03-2015 06:27 :: HundaSunny :: Replies: 0 :: Views: 693
Check the core temperatures with hwmonitor. If any sensor gives unusual read out, look into it. Another thing is the power supply, make sure it is not faulty or overheating. Does your motherboard has power led onboard? does it turn off when the pc power of (...)
General Computer :: 02-02-2015 15:21 :: d3javu :: Replies: 3 :: Views: 2232
When you power up both PIC and display, is your 5V OK ( voltage value keep normal).
If yes, it is not a probleme of max current value possible by the power source (3A instead of 1A capability)
but a probleme of timing exposure to light up the led, and also if timing is very short, you must increase (...)
Microcontrollers :: 01-19-2015 15:12 :: paulfjujo :: Replies: 2 :: Views: 641
led bulb have small circuit inside which makes DC voltage for powering led. This circuit is power supply for led which is usually done using one "big" capacitor ~1uF, 275VAC or similar for step down voltage to small DC value.
This is reason why it is not (...)
Microcontrollers :: 01-11-2015 19:54 :: mrcube_ns :: Replies: 8 :: Views: 3136
Defective RC receiver IC, defective power supply causing strong RC receiver supply voltage ripple.
Strong optical interferences from led or FL with high switched mode supply might be also a reason.
Elementary Electronic Questions :: 01-11-2015 18:47 :: FvM :: Replies: 5 :: Views: 601
It is a 13 inch LCD + led; model is SLTV-1369AP -Chinese of course.
Model seems to be used by several brands, as RCA, Kontech, AMP'd , Skyworth, ClearTech..., some using other letters with the "1369" model figures. No FCC number on it.
power supply is fine. Solid 12V at all times.
The unit shuts-off and (...)
Service Manuals, Requests, Repair Tips :: 01-04-2015 01:14 :: Externet :: Replies: 1 :: Views: 1290
Check power supply connections. Check input and output voltage of voltage regulator in module
Elementary Electronic Questions :: 01-03-2015 05:23 :: amayilsamy :: Replies: 1 :: Views: 783
I started a blog of home lighting using common wall powered leds using unregulated, regulated and modified adjustable Laptop Chargers.
CREE 1~3W leds can be used in series to match the supply voltage and parallel arrays on a string of wire to distribute. Thermal runaway avoidance is satisfied but
Show DIY :: 12-17-2014 09:01 :: SunnySkyguy :: Replies: 0 :: Views: 4907
Forget electronics and buy cheap analog panel meter. It works without power supply and you will measure voltage instead indicate it by led. You can get it for few dollars with free shipping.
Analog Circuit Design :: 11-02-2014 23:19 :: Borber :: Replies: 12 :: Views: 1782
If you use a resistor, then the resistor uses up power, if you are powering just one led, then the resistor will use about 100 times more power then the led. So the circuit becomes extremely inefficient. A capacitor wastes no (...)
Elementary Electronic Questions :: 10-31-2014 09:04 :: chuckey :: Replies: 12 :: Views: 1383
Buy the ebay light controller and a 12VDC power supply to light your led strips when it gets dark.
If you use an LDR or a solar panel then you need somebody to design and make a circuit to do it.
Analog Circuit Design :: 10-06-2014 14:20 :: Audioguru :: Replies: 12 :: Views: 1840
Sounds like your MB is killing your power supply. I would measure the power supply inputs of the MB with an ohmmeter.
General Computer :: 09-23-2014 17:48 :: barry :: Replies: 4 :: Views: 2037
Vin is the power input, not a bias input and This is a Boost regulator with Buck PWM on the low side.
48V is the output not vin.
Expect that your input current will be 125% x Iout * Vo/Vin e.g. if 48V, 500mA out , Iin=2.73A
Power Electronics :: 09-12-2014 20:23 :: SunnySkyguy :: Replies: 1 :: Views: 645
If the power supply already provides an average and peak current limitation there is no problem to drive directly without a resistor, assuming it is properly sized, otherwise once a led is a device that behaves non linearly to temperature variation and to biasing current (particularly at the knee conduction curve region), a (...)
Elementary Electronic Questions :: 09-07-2014 10:16 :: andre_teprom :: Replies: 6 :: Views: 727