Voltage regulator is a device which provides fix output voltage in spite of the variable input voltage supplied. It is a three terminal device. Voltage [[wysiwyg_imageupload::]]regulator basically comes in two different series: 78XX and 79XX. Voltage regulator under 78XX series are designed for positive inputs i.e. if while 79XX series are designed for negative inputs.

此处显示的电路太容易了。在此电路中，IC1以异常模式安装。在恢复功率时，通过电容器C1的IC1的引脚2处于低位，并且相同IC开关的引脚3到高。在IC1的引脚4中，它是一个重置引脚切换到高状态大约10秒钟。当C1处的电压达到所提供的电压的2/3时，电容器开始排放并输出转换为低，将引脚4接地，这是一个重置引脚，因此跌倒电路脱离了动作。

本教程解释了如何为所有电子设备和嵌入式系统实验制作自己的电源单元。它还具有备用电池，将在削减电源和显示器的情况下使用。

This capacitor power supply can deliver 12 volt DC and 100 mA current to power low current devices. It is provided with surge protection and is totally isolated from mains supply using two capacitors in the phase and neutral lines. So the connected device is safe even if the phase and neutral lines changes. Transformer…

The proposed simple electronic spy Bug circuit is basically a high gain amplifier using the IC 741 as the heart of the circuit and also a couple of high gain output transistors. The IC 741 if configured as a non-inverting amplifier which performs the function of a pre-amplifier stage. The gain of this IC 741 preamplifier stage may be varied as desired, using the pot across its input and output pin outs. The gain setting is used to set the sensitivity of the amplifier and is set to maximum so that even low volume speech conversation may be picked through it. The mic at the input transforms sound vibrations into minute electrical pulses, which is further amplified by the IC 741 to suitable levels before applying it to the output amplifier stage consisting of a standard DARLINGTON stage. This Darlington stage is made using a couple of high gain transistors bc107A’s.

In this project a protoype circuit which can switch on the device when the light falls on it. For this I will use LM358 IC which is operational amplifier. I have made the circuit with LDR and few more components. But when I interchange the LDR with photodiode, phototransistor and transistor (L14F1) my circuit works well without changing any other components. Before understanding the circuit which I have developed, first let’s have a look on the components used in the circuit.LM358 consists of two independent, high gain operational amplifiers in one package. Important feature of this IC is that we do not require independent power supply for working of each comparator for wide range of power supply. LM358 can be used as transducer amplifier, DC gain block etc.

Many of us have modular kitchen which have chimney to extract smoke out so that smell of smoke will not fill in kitchen and avoids the harmful effects of smoke on furniture and kitchen utensils. But sometimes it happens we forget to switch on the chimney which results in smoke in kitchen and sometimes we forget to off the chimney leading to the wastage of electricity and money. So to solve this problem we have described a circuit which will switch on the fan automatically when smoke reaches to point and off the fan automatically.You can also use this circuit while soldering because as we know solder fumes are not good for health so it will on the fan to extract the smoke present in room leaving smoke free area.

这是一个简单的拍摄游戏，包括红外脉冲发射器和接收器。有8个白色LED和一个绿色LED，可以定期点亮。当绿色LED亮起时，玩家必须向接收器射击。这是一个简单的初学者项目，可用于制作更复杂的项目，例如“激光标签游戏”。该电子游戏的红外枪（发射器）是围绕IC1计时器（NE555）建立的，该枪支是一个固定的多振动器，中心频率约为35 kHz。接收器电路具有3个主要ICS - 2个NE555S（一个作为不可分割的多振动器连接，另一个用于单稳定操作）和1个CD4017B（十年计数器）。这些电路可以修改以制作“激光标签游戏”。阅读更多信息，以了解该电路中如何使用IC555及其工作原理。

事实证明，称为脉冲振幅调制（PAM）的简单脉冲调制技术比PWM更有效，并且对于PPM等单个脉冲而言，恒定功率。在PAM中，根据调制信号的幅度，各个脉冲的振幅变化。PAM调制器和解调器电路简单相比…

RGB灯泡意味着由三个LED组成 - 红色，绿色和蓝色。它产生许多不同颜色的光。众所周知，红色，绿色和蓝色是三种原色，所有其他颜色都可以通过以不同量混合这三种颜色来生成。因此，在RGB灯泡中，红色，绿色和蓝色LED的强度各不相同 - 意味着红色，绿色和蓝色的量变化以生成不同颜色的不同颜色或阴影。LED的强度使用NE555 IC生成的PWM变化。。NE555芯片以敏捷模式连接时会生成PWM。因此，三个NE555 IC用于改变三个LED的强度 - 红色，绿色和蓝色。

1. It is not possible for all the electronic beginners to buy a device which can test all the components as it is highly costly.2. So for all those peoples “All in one Tester” is a solution.3. This circuit is quite easy to make and also cost fewer amounts to their pockets.4. This device can test approximately all the components starting from simple resistors till typical IC’s.5. With the help of this device it is also easy to check the polarity of components, continuity testing and logic state as well as multivibrator activity.

在大多数房屋中，门铃是常规的叮当型。我们大多数人都不喜欢它的声音。由于具有弹簧机制的机械运动部件，因此长期耐用性值得怀疑。我家里还有一个这样的门铃。一段时间后，其性能恶化，有一次由于其嘈杂的刺激性声音而变得完全无法忍受。市场上可用的新型门铃是鸟音铃。它们的成本很高，甚至我不喜欢它，因为它的频率高和高音量的声音输出。

Here I am presenting very interesting project that can be use as a nice show piece or display item with live colours. The desire colour can be set manually from 7 different RGB (Red-Green-Blue) colour combinations. FOC light fountain is a made up of hair like small optical fibre cables bunched togather at one side. When light of different colours is given from that side the entire bunch of fibers look like fountain of light. Such show pieces are readily and easily available in gift article shops or show piece item shops.

This tutorial shows you how to make a phone charger which uses any DC source (AAA/AA/SLA battery) as input and is efficient in terms of power utilization. We’ve been holding onto 7805 regulator IC from a very long time and hence a question may arise as to why we are not using the same this time. Well all these days we didn’t care about the efficiency since it was either a low current application or ones which didn’t run completely on battery but this time it is different. This time our aim is to create a device which runs on battery and needs to be utilizing the battery’s energy efficiently.

这是一个非常简单的电路。这可以在汽车中用作顺序表示光。该电路是在两个IC的帮助下构建的，这是CMOS计时器IC，即555计时器，另一个计时器是十年计数器IC，即CD4017。在此电路中，使用555个计时器的模式用于触发计数器。电路中也很少使用其他离散组件。

我们的政府已经规定,晚上时间if any vehicle is approaching from opposite side headlights of our vehicle should be dimmed to avoid focusing of . light on the driver in opposite vehicle inorder to avoid accidents . But, we ignore this which is cause for many accidents at night times.

In Domestic and industrial applications we use water tanks to store water. Filling water in tank using water pump is quite common. When water inside the tank is over we have fill it by pumping water using an ac motor and after tank is filled with water we have stop the motor to. This is manual system means turning ON motor when tank is empty and turning it OFF when tank is full is manual. But now it is no more manual. Automatic motor on and off system based on tank water level is already available in market. This system is wired system and connecting circuit and arranging wires and circuit is little bit complex. In this system the biggest drawback is wired connections between control circuit and motor. So we have to use lengthy wires from top of the home to water supply unit and control circuit unit. If we want adapt this system for big building it will become too expensive and too complex.

The circuit uses the CMOS dual D type flip flop CD4013 which contains two positive-edge triggered flip flop to toggle a load connected through a relay. Now [[wysiwyg_imageupload::]]with the help of a switch you can on the device once pressing it and off the device again using the same switch. In CD4013 each module is further equipped with a group of pin outs assigned as data, set, reset, clock input and a couple complementary output Q and Q(not) . As we know it has couple of output that change or toggle state as response to trigger applied to input terminals. In this circuit, one is wired in toggle mode while other is not used. Using this circuit we can easily control AC and DC appliances remotely through inexpensive low voltage cable and a standard push to on switch. This circuit can easily support a cable length of 25 meters.