Some Type of Resistors


Much types of Resistors, is the most commonly used of all electronic components. There are different types of resistors are available with their primary function is to limit the current through the electrical circuit and to lower the voltage. Resistors are "Passive Components", which does not

What is LDR or Light Dependent Resistor


Light Dependent Resistor or LDR is a resistor that changes its resistance due to the intensity of light absorbed. LDR is also a resistor having a negative temperature coefficient, where the resistance is affected by light intensity.

Function of IC LM35 and How It Works

Do you looking for the function of IC LM35 ? The works of IC LM 35 typically serves as a temperature sensor. IC LM 35 is packaged in the form of integrate circuit which prisoners rates is a function of temperature, the temperature will cause a change of IC LM 35.

Circuit of Simple Temperature Detector

This is an explanation about circuit of simple temperature detector. In many ways, the development of science and technology is getting easier for human activities (especially those who are ready to receive it), the various creations of human creativity in any variety of small things to things that are not small.


Preamplifier Microphone with 2 Transistor

Microphone preamplifier or often known as mic preamp can be made use simplemicrophone preamplifier circuit as follows. 2 microphone preamplifier circuit uses 2transistors are PNP and NPN transitor amplifier.

Power supply using tube Z2C


Power supply using tube Z2C are designed specifically to provide power supply voltage to the EL-34 tube amplifier push-pull in the previous article. Power supply with Z2C tube to tube power amplifier is made with a tube rectifier Z2C.

Compass direction magnetic sensors


Compass is a tool for navigation for a direction, a direction in this article referred to is the magnetic module CMPS03 Compass. Magnetic Compass Module CMPS03 often used in making robots in the contest KRCI.

PWM Controler With Ic 555


IC Timer 555 has a basic PWM controller with pulse width control feature 0 .. 100% which is controlled using the R1, at the time of controlling the oscillator frequency relatively stabi so it may be used to build the Simple PWM controller. Frequency of Simple PWM controller 555 depending on the value of R1 and C1, values ​​shown R1 and C1 will form the output with a frequency of 170 to 200 Hz. Diode-diode used in the Simple PWM controller With this 555 can use a 1N4148.

Circuit Serial To LCD


In making an electronic device using a microcontroller, we often faced with shortages in ports for line I / O or LCD viewer. In the article series LCD with 74HC595 Serial To this there is a solution to overcome the lack of ports or pins of the microcontroller is to convert the parallel bus system such as the LCD into a serial sequence To Serial LCD with 74HC595 this. The series of LCD Serial To change the system of parallel bus into a serial LCD IC 74HC595 premises. 74HC595 IC on circuit Serial To this LCD is a digital IC that it functions as a serial to parallel shift register is equipped with a latch. With the functions of the IC 74HC595 parallel LCD bus system in enter in great numbers have turned into a serial of microcontroller and be a series of Serial LCD with 74HC595 for this. Now with a range Serial To LCD with 74HC595 for the microcontroller is expected no more stories lack the pin / port of the microcontroller in the manufacture of electronics equipment.

Magnetic Detector


Magnetic switch is a circuit which can respond to magnetic fields that were around the sensor. The series of magnetic switches uses sensors in the form of limit switches that provide an additional metal plate that can respond to a magnet. Magnetic switch circuit is made with an NE555 monostable multivibrator and a flip-flop togle from IC CD4013. The series of magnetic switches uses 12VDC supply voltage and the magnetic circuit is mounted indicator switch which serves to give a signal when the sensors respond to magnetic fields using the LED D1.


Magnetic switch is a circuit which can respond to magnetic fields that were around the sensor. The series of magnetic switches uses sensors in the form of limit switches that provide an additional metal plate that can respond to a magnet. Magnetic switch circuit is made with an NE555 monostable multivibrator and a flip-flop togle from IC CD4013. The series of magnetic switches uses 12VDC supply voltage and the magnetic circuit is mounted indicator switch which serves to give a signal when the sensors respond to magnetic fields using the LED D1.

Sensor Ultraviolet UV Tron

Sensor Ultraviolet UV Tron is a flame sensor which is often used to detect the presence of sources of ignition under ultraviolet wave emitted by the fire. UV Sensor UV Tron can be applied with a microcontroller, such as ultraviolet UV Tron sensor is used for detecting the source of the fire on the robot in a firefighting robot contest.

Amplifier uses IC TDA7375A


4 channel amplifier uses an IC TDA7375A and capable of producing power 18watt output for each channel. TDA7375A amplifier circuit can be used to make 2 channel stereo configuration is often applied to sound systems in cars. That is 1 channel stereo for the front and 1 channel stereo for the the rear. Source voltage needed for this amplifier is a 12VDC-15VDC. Amplifier circuit with IC TDA 7375A is very simple and easy to make.

Symmetrical Power Supply LM317/337 Variable


Symmetrical Power Supply LM317/337 Variable is circuit symmetrical power supply with output voltage output that can be set (adjustment). Circuit of symmetrical power supply LM317/337 variable uses  variable DC regulator LM317 to regulator positive and negative voltage regulator LM37 variable for negative voltage regulator. Symmetrical Power Supply series LM317/337 Variables can be used to provide the source voltage with maximum current 1A.

UPS Power Supply


UPS Power Supply circuit can be use for regulated and unregulated voltages with different regulators and batteries. For 15-volt regulated supply tariffs to use two 12 volt batteries in series and the 7815 controller. There are a lot of flexibility in the circuit.

PWM Motor Controller


PWM Motor Controller With Forward And Reverse is circuit controllers for DC motors controlled by PWM technique . The series PWM Motor Controller With Forward And Reverse It can control the DC motor rotation direction. Speed ​​control by PWM technique through MOSFETs Q1 IRF150. Then to play with the directional control relay which is controlled by Q10 using control signals in the form of logic 0 and 1. The series PWM Motor Controller With Forward And Reverse It requires 12 VDC supply voltage.

Power Supply with Z2C Tubes


Power supply with Z2C tubes are designed specifically to provide power supply voltage to the EL-34 tube amplifier push-pull in the previous article. Power supply with Z2C tube to tube power amplifier is made with a tube rectifier Z2C. Just as the power supply for power amplifier tube before, the power supply is also using 3-level filter with electrolytic capacitors. Circuit power supply with tube rectifier Z2C can give +210 VDC output voltage.

Stereo Power Amplifier STA550


Stereo Power Amplifier 2x70Watt STA550 is chip audio power with BASH concept that can be connected with digital devices. 2x70Watt STA550 Stereo Power Amplifier is an amplifier with BTL system with symmetrical power supply with ground. Power amplifier STA550 uses power output transistor which is on the chip and is set to produce a high efficiency audio power. Power output on the STA550 is using the system without copling ac bridge (direct) and zero offset.

Audio Mixer With FET


Audio Mixer With  FET is a very simple audio mixer. Simple Audio Mixer With this FET circuit is Used for mixing (mixing) 2 channel audio signal. Image circuit the Simple Audio Mixer With a FET on this page is a sample output for 1 channel only, if Want to stay a stereo system to make two pieces of circuit Simple Audio Mixer With this FET.

Wind Meter Anemometer


This is series of simple wind gauge (anemometer). This circuit can measure wind speeds up to 75m / s using this circuit.

Transistors Q1 and Q2 are used to feel the wind.Thermal impedance between the transistor and

Seven Segment 4 Digit

 Seven segment 4 Digit display Multiplex in electronic device applications is drain port  a micro controller or data point that will be on display, especially if the data to be displayed more than 1 digit. necessary path to control the resources of each 7 segment and the path to input data on the 7 segment. Circuit 7 Segment 4 Digit Multiplex is a way to save the port or micro controller data path that will be displayed. Series Display 7 Segment 4 Digit Multiplex uses BCD to 7 segment decoder 74LS247 BCD to encode data from the data that will be displayed, then for each resource viewer 7 segment using the set of transistors as electronic switches. Current flowing in the viewer in a series of 7 segment Display 7 Segment 4 Digit Multiplex is in limiting use yag resistor in series pairs in each collector transistor.

Traffic Lamps Circuit


Traffic lamps circuit controls 6 units LEDs (red, yellow, green). Time sequence followed CD4017 CMOS IC as a decade counter and NE 555 timer IC. counter output 1 to 4 using 4 diodes so that the (red-north / south) and (green) 4 LED is the first timers. counter to 5 (foot 10) turn (yellow) and (red). The counter 6 to 9 is also controlled by the 4 diodes (red  and yellow). The time period for the red and green LED 4 times longer than the yellow LED. To adjust the speed by varying the 47K ohm resistor value. Eighth zener diode 4148 is divided into two parts and each got 4 input OR gate of IC CD 4017.

Automatic lamps with photocell


This is a photocell circuit for detecting the light intensity. At full light the resistance of the photocell will be few ten ohms and at darkness it will rise to several hundred ohms. IC1 Op amp uA741 is wired as a comparator here. At darkness the resistance of photocell increases and so the voltage at the inverting input of the IC1 will be less than the reference voltage at the non inverting input. The output of the IC1 goes to positive saturation and it switches ON the transistor to activate the relay. By this way the lamp connected through the relay contact glows. The diode D1 works as a freewheeling diode.

Circuit Color Detector


This color detector circuit can detect eight colors, it's blue, green and red (primary colors), magenta, yellow and cyan (secondary color), and black & white. The series is based on the fundamentals of optics and digital electronics. The color of the object that needed to be detected must be placed in front of the system.


Voltmeter and ampere meter using PIC


Volt meter and ampere meter with PIC can be used to measure voltage and current simultaneously. The series of volt meter and ampere meter with PIC uses a PIC16F876A as a data processor voltage and current are measured. This circuit uses the LCD 16 × 2, which is used to display data voltage and current measurements. In the article volt meter and ampere meter with PIC are discussed only limited to hardware only. For more details can be seen from the image volt meter and ampere meter with PIC .

Broken Charger Detector


With this circuit we can detect when charger wire was broken. This detector will work when the charger wire damage the detector will sounds an alarm warning. So we can know the charger wire is broken.


Temperature and Humidity Sensors


Temperature and humidity sensors used are SHT75. This sensor is a chip that can measure temperature and humidity as well. The use of these sensors with consideration of its small size and reliability. The output of this sensor has the form of digital data in the chip because it has been there for a 14bit ADC. Temperature measurement range between -40-123,8 º C and humidity between 0-100% Rh. measurement accuracy reaches ± 0.3 per increase in 25 º C for temperature and ± 1.8% RH for humidity.

Light Switch for Lamps Controller


Light switch series with photo transistor above can be used to control garden lights, street lights, or night lamps automatic. Light switches can be made from several kinds of light sensors. The circuit of light switches are made using a photo transistor light sensors. The series of light switches or light control switch is very simple, because it is made with 1 piece of transistors, 1 piece of photo transistor, 1 relay, 1 variable resistors and diodes.

Rain Detector Circuit

Rain Detector Using 555 is a simple alarm that can be used to find out when rain was came. Rain Detector Using In principle this is an a stable multivibrator 555 which is prepared by IC555 with a sensor attached that can detect water. A stable multivibrator with the 555 is set in the audio frequency with a frequency of 1 KHz. Rain Detector circuit 555 can be supply with voltage source that is free enough from 5-15 VDC.


Automatic Water Pump Controller


Circuit of automatic water pump controller is functions to control the water pump automatic in a reservoir or water storage. As the water level sensor made ​​with a metal plate mounted on the reservoir or water tank, with a sensor in the short to create the top level and a detection sensor for detecting long again made ​​the lower level and ground lines connected to the bottom of reservoirs or reservoir.

Circuit of DC To DC Converter


DC To DC Converter circuit  is used to convert DC voltage to DC voltage with different concepts. DC to DC converter circuit +12 V to + /-20V is working to change the battery voltage from 12V DC to 20V DC voltage symmetrical. DC to DC converter circuit is often applied to the audio power amplifier in car audio systems.

Circuit of fire alarm detection

The rooms are vulnerable to fire as a storage material, flammable, requires a system to prevent the occurrence of a fire. For example, using a fire alarm detection, so for example occur if a flame that can quickly and others that are easily fire did not cause a fire is greater.

Room Noise Detector

Every room has a noise level,you can detect the noise level of your room with noise room detector. You can see the series of noise detector it's look like simple circuit and everyone can make it.

Police Siren Circuit

This is image of police siren circuit, this siren series can be applied in motorcycle or car. Electronic components used are 2 pcs NE555 IC as an stable multivibrators. Frequency of police sirens are controlled by IC NE555 Pin no.5.