The post discusses a 555 based PWM circuit which can be implemented as a 150 nos or more LED light intensity controller circuit. The idea was requested by Mr. Anil
电路请求
我想在脉冲和连续模式下IC 555的帮助下运行150个5mm的NOS LED。
I want use 12V/5A DC supply
Thanks & early reply is highly appreciated.
感谢和问候
Anil Rustagi
The Design
该图显示了使用IC 555的基于PWM的LED强度控制器电路。
IC 555 are popularly used in most PWM based circuit applications due to their easy configuration and precise PWM generation ability which is adjustable right from minimum to the maximum.
In the shown design the555IC is configured in its standard PWM mode有一个微小的变化，其中它的放电PIN7用作输出，而不是通常用于放电函数的常规PIN3。
上面的配置使功能更有效，并使占空比的空间更加清晰，更准确。
Pin7 becomes responsible for creating negative pulses only for the attached transistor, while the positive pulses are derived from the 10 k resistor across the base and positive of the transistor.
VR1 is used as the PWM control pot which almost provides a range from zero to the maximum supply voltage for the LEDs through varying ON/OFF duty cycles as determined by the setting of the 100k pot
TIP122 is rated to hold upto 5 amp with adequate heatsinking meaning more than 150 LEDs rated at 20 mA each can be included with the device as shown in the circuit diagram.
Hello Mr.Swagatham,
我正在构建双极性PSU的过程中，具有中心水龙头变压器，LM317和LM337电路，共享共同地面线路，但我想知道如何通过根据需要根据需要根据需要根据需要根据需要的lm337电路将其用作单声道或双极性模式。我怀疑仅将变压器的切换到负面线路是否会解决问题，还是我应该为ICS构建单独的独立电路并将其接地线连接到变压器GND线路？
Hello Gururaj,
您可以将SPDT开关连接到电源的输出中，以实现选择模式。
Use the center lead of the switch as the negative output, positive will be from the 317 positive out.
the other two leads of the switch could be hooked up with the (-) and the GND of the supply for the intended selection.
I would also like to build voltmeter featured in your blog using ICL7107 and MAN6910 led display are those both components readily available at shops in lamington road ?
I think it should be available unless the IC is obsolete now…
Mr.Swagatham,
Thanks for prompt reply ,The solution mentioned by you is helpful but the thing is my psu will be having three output terminals (+),gnd,(-) and i was thinking of solution for switching off lm337 circuit from negative power supply it gets from rectifier bcoz i wont be using lm337 as often as lm317 so switching it off would lead to better temperature control and energy efficiency. Pls help me in this regard.
Gururaj，在这种情况下，我们也可以采用SPDT开关，开关的中心线与电路的中央公共接地线相连，其中一个外线线与电源的（ - ）连接到（ -LM337线的）。
The other free lead of the switch connects with the ground supply of the power supply.
The above set up will basically connect the entire transformer voltage to LM317 when the single mode is selected, and in the dual mode it will be in the usual configuration, meaning if the transformer is 15-0-15 then in the single supply mode the LM317 would be subjected 0-30V input…while otherwise it will be in the usual +15 and -15V
Hello sir..
You have firealarm curcuit. Using IC555 or any other for my school project.
Plzzzzzzzzzz suggest me as soon as possible .
您好Saurabh，您可以参考以下文章，它不是使用555而不是IC741：
http：//www.brighthubengineering.com/diy-electronics-devices/113566-make-a-simple-ic-741-smoke-detector-circuit-schematic-diagram-enclosed/
…它也可以轻松地转换为555电路。
你好先生…
我的问题..在凝管中，我可以在4001代替In4007使用二极管。两者都一样吗？
And Can i use capacitor 0.01i or 0.22u in the place of 0.04u
Because these items is not available in market.
1N4001 will block not more than 50V while 1N4007 is rated for upto 1000V…if your circuit is well below the 50V mark then any of the two can be used..
Hello Mr.Swagatham,
感谢您的及时答复，建议的解决方案很有帮助，但它处理了输出阶段。Whereas我想做的是通过从变压器上切断电源的电源来激活或停用LM337电路，因为我不会像正常的那样使用负电压。我认为电压会导致功率效率和更好的温度控制，我的PSU将有三个端子（+），GND，（ - ）线，因此请在这方面帮助我。我还认为仅将开关合并到变压器中线到电路不会有很大帮助，因为从正电压电路到负电压电路可能会产生溢出效应。
Hi Gururaj, the above explained solution will work, other more effective and complex ways could be figured out but may not be necessary with the above simple solution in hand….
Thank you very much
Hello Mr.Swagatham,
Based on your suggestion i have drawn a rough schematic pls kindly have a look at it and let me know if i got it right.
picpaste.com/revisiedschematic-nm4dvwwt.png
Hello Gururaj,
Yes that's correct…..use a SPDT toggle switch for better reliability.
变压器优选为12-0-12V，以使LM317电路的总电压不超过32V
Sir, you are doing a great job with this blog.
Will you help me? I ve parts of an emergency lamp that became useless due to battery failure. It is China made 31 LED folding type table lamp using 4.5v battery. You might have seen it. Its battery is not available in local market. I made an outline of its circuit. (It is actually modified version of your blog//www.addme-blog.com/2012/04/how-to-make-led-bulb-circuit.html。）您可以通过用6V 4.5AH电池替换4.5伏电池来重新设计电路吗？如果您也添加了过度充电指示器，那就太好了。如何邮寄电路图？
Alchemist, just add three 1N4007 diodes in series with the positive of the 6V battery and it will become compatible with the existing 4.5V circuit.
If possible I'll try to update a transistorized high low battery indicator in this blog soon.
Hello Mr.Swagatham,
感谢您有关变压器的提示，我会牢记这一点，但我可能知道您提到32V限制的原因。
我想安装其他变压器作为Voltmeteri，可以使两个变压器像英寸相距一样恶化其性能吗？
您好Gururaj，LM317的最大耐受电压为35V，这就是为什么我警告将其保持在32V以下的原因。
why two transformers?? you can make it using a single center tap transformer.
Mr.Swagatham,
第二个变压器是用于驱动电压表电路的，尽管我对特定的要求进行了询问，但请考虑这是一般的问题，因为它可能使我受益，以及其他可能面临多个变压器的需求，因此有关安全安装的技巧他们将很有价值。
Mr. Gururaj, you can use a 7812 IC or IC 7805 as per the voltage rating of the voltmeter circuit and power it from the same transformer which is being used for the LM317
Hi, Swagatam sir.
Thank u so much for this blog. I made ur 1W mains led circuit. It's working very well.
Can u provide me circuit for 240V drived 120 nos led (5mm straw hat). It must be reliable surge protective coz our supply fluctuates many times.
我想用它照亮我的门廊。
谢谢你，先生。
Thank you Lord of Blackspot,
您可以为您的需要尝试以下设计：
//www.addme-blog.com/2014/04/simplest-100-watt-led-bulb-circuit.html
如果使用5mm，20mA LED，请确保将输入电容器值降低到0.47UF/400V
all the best to you!
Hello Swagatam I need to build a LED grow light , can you help me with the power supply straight from the main?
领导的比例是4:1,4红色蓝色,the res are 2.2 volt and the blue are 3.3, all 3 watt led..
预先感谢您的帮助..
regard walter
Hello Walter,
you can make three strings, in the following manner:
2strings of red LED, each consisting of two red LEDs in each series and a 1.5 ohm 1 watt resistor on each series.
a third string consisting of a single blue LED with a 3 ohm 1 watt resistor.
put all these strings in parallel and power it using your smart phone charger.
or alternatively you can connect all the 5 LEDs in a single series with a 3 ohms resistor (1 watt) and power it using a 12V 1amp adapter
thanks
hii sir.i想要20瓦LED驾驶员Circuite.plz帮助我。
尊敬的先生，
I'm Dhammika from Sri Lanka. How can modify this circuit to flash 150 LEDs with flashing time adjustable. Thank you for your work.
Dhammika, you can add another in series with pin#3 and VR1 center arm..and adjust this pot for getting the adjustable eature
谢谢你！其实我的意思是这些1闪烁50LEDs with facility to change the blinking speed.
可以通过先前建议的锅布置改变频率速率来改变闪烁
Hi,
今天制作了上述CKT，并尝试使用它驾驶5x 5W LED（9-12V）。巡回赛正常工作，但与之相关。仅在100％亮度时，我没有闪烁。下次使用PC SMP（修改）。请告诉我应该是什么问题以及如何解决问题。
（将发布驾驶员在行动中的视频的链接）
尝试将C1值减少到10NF或1NF，然后检查差异。
我看到了视频，这可能是由于555输出的频率较低，C1值下降会增加输出频率并希望纠正问题……。
Tried today,replaced .01uf to .001uf.The flickering have reduced but still noticeable.Should I further decrease capacitance?
我更换了0.01uf而不是C1的C2盖（我认为那是错字）。我应该减少C1吗？
尝试将0.1UF的C1降低到0.01，瞧，它可以使用:)。我还将C2保留为0.001。
在LED银行部分之前，还有什么方法可以降低电压下降？
It was not a typo,…C1 is responsible for the frequency rate not C2…therefore C1 needed the modification.
reducing C2 will increase the stray signal pickup from atmosphere so it's better to increase its value instead of reducing.
sorry i could not understand your second question
“在LED银行部分之前，还有什么方法可以降低电压下降吗？”
Nevermind with my last question,I thought there was some voltage drop across the ckt :P.
您将使用Darlington对（2N2222和2N3055）提出的较高放大器的电路尝试。
Also m confused,should I directly feed pwm to 2n2222 or should i use a resistor bw pwm o/p and 2n2222 base.Also Where should R2 be connected across then(before or after the base resistor).
非常感谢您的工作兄弟，请继续
OK no issues.
You will definitely require a resistor at the base of the 2N2222, it could be anything between 1K and 10K.
i appreciate your involvement too..keep up the good work!!
将制作高放大器。在同一ckt中，可以提示2055工程而不是2N3055？
任何NPN功率晶体管都将在显示的配置中工作…
Hi again!Just wondering if multiple TIP 122s can be used in parallel using the same pwm output from the 555 ckt from above to enable higher amps loads.
Also if above ckt can be made using mosfet with an NPN (before mosfet)to amplify PWM signal in order to handle higher currents.
关于我上一篇文章中有关使用多个提示122并行的第一个问题，与同一PWM并行喂养，有点像这样：https://skaled.files.wordpress.com/2013/05/image10.pngbut mosfets with TIP 122.
yes that's possible, your diagram is correct and can be used in the application….
Mr. Swagatham,
Thank you so much for this circuit, it works great.
It’s my pleasure Jaimitove, I’m glad it worked for you!!
Mr. Majumdar,
I would like to drive directly a serious of 72 no SMD 5730 ( LED),12 V DC , ( Specification written on the Strip 990 x 12*1.0-5730). Kindly let me know a suitable circuit diagram at your earliest convience.
问候，
DK Ghosh
Kolkata
09748747010
Hello Mr. Ghosh, since the LED strip is not heatsink based, it may not require a current controlled circuit. You can try any standard 12V 1 amp adapter to power the strip, provided the total consumption of the strip is below 1 amp
Hi Sir, I Want New Design for 3 10 V LED Bulb Run in 24 Hours, Like 12v – 12ah Battery, Fast Charge Battery, Inverter Must-Have USB Mobile Charger 3 amp, And Three Port For LED Please Design This Project