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This is Infrared Remote control transmitter circuit has high performance and can be applied to works with the various infrared receiver circuit. To made easily. And best to save your money. I need not tell you much, what is the infra red remote control. Because you have known as well. so I recommend circuits 2 types, as appropriate. - The first is simple circuits. Infrared light from a set to a set to work immediately. - Then another circuits, is designed to have wider applications. Can be set program that will be must have a beam of infrared light to circuits few times to work. Which both need to have the good Infrared Remote control circuit, before. The infrared remote control transmitter circuit. Usually, when input voltage to the infrared diode. Will be have the beam infrared light which can be seen with the naked eye out -But in real applications. We need to enter the signal pulse with a frequency of about 5kHz, to the infrared diode, for eliminate the various interference. And re...

Almost all 24V power systems in trucks, 4WDs, RVs, boats, etc, employ two series-connected 12V lead-acid batteries . The charging system can only maintain the sum of the individual battery voltages. If one battery is failing, this circuit will light a LED. Hence impending battery problems can be forecast. The circuit works by detecting a voltage difference between the two series connected 12V batteries. Idle current is low enough to allow the unit to be permanently left across the batteries. Circuit Diagram Parts: R1 = 2.K R2 = 4.7K R3 = 39K R4 = 39K R5 = 1.5K R6 = 1.5K Q1 = BC547 Q2 = BC547 Q3 = BC557 D1 = 3mm Red LED D2 = 3mm GreenLED B1 = DC 12 Volt B2 = DC 12 Volt

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Programming Learning MCS51 Learning Programming MCS51 becomes mandatory we learn if we want to use the MCS51. In the first part of this Learning Programming MCS51 we will learn together about the basic programming language MCS51 microcontroller. Where to program MCS51 outline there are 2 core parts of pemrogramanya language is "Words Work" and "Object". In the article Programming MCS51 this first part we will study first the "verb" is a command group Peng-copies of data, the command group arithmetic and logic command group. Reference to DATA IN PROGRAMMING MCS51 Data can be in many different places, thus known a few ways to describe the data (in English often referred to as 'Addressing Mode'), among others, as follows: The mention of constant data (immediate addressing mode): MOV A, # $ 20. Constant data is data that was in the instructions. Examples of this instruction has the data meaning a constant $ 20 (as a constant data marked with '#...

This circuit was designed to provide that continuous light lamps already wired into a circuit, become flashing. Simply insert the circuit between existing lamp and negative supply. Especially suited for car or panel pilot lights, this device can drive lamps up to 10W. Circuit diagram : Two-wire Lamp Flasher Circuit Diagram Parts: R1_____6K8  1/4W Resistor R2_____270K   1/4W Resistor R3_____22K   1/4W Resistor C1_____220µF   25V Electrolytic Capacitor C2_____10µF   25V Electrolytic Capacitor D1_____1N4002  100V 1A Diode Q1_____BC557   45V 100mA PNP Transistor Q2_____BD139   80V 1.5A NPN Transistor LP1_____Existing filament Lamp: any type in the range 3-24V 10W max. SW1_____Existing On-Off switch B1_____Existing V DC source: any type in the range 3-24V suited to the lamp adopted Notes: Break lamp(s) to negative supply connection(s), then insert the circuit between existing lamp(s) connection(s) and negative supply (respecting polarities!). C1 value can be varied from 100 to 1000µF ...

This amplifier circuit uses the output transformer as an additional amplifier in the output. You can use the transformer output transformer-old has not used but still in good condition, you can use it in this series. For this amplifier IC used is M51503L, this ic has a voltage limit of up to 7 volts only and a minimum of the incoming voltage about 2 volts. Actual output issued from the IC is 0.2 Watts, but once applied to the circuit maximum output of about 5.3 Watts. Part List : Resistor R1 = 75R R2 = 330R Capacitor C1 = 1uF C2 = 47uF C3 = 100uF C4 = 0.33uF C5 = 0.47uF Transformer T1 = Transformer Output OT240 IC IC1 = M51503L

This simple Simple Mat Switch Circuit Diagram produces a warning beep when somebody crosses a protected area in your home or office. The switch, hidden be-low the floor mat, triggers the alarm when the person walks over it. The circuit uses a conductive foam as the switch. It can be two small pieces of conductive pads usually used to pack sensitive ICs as antistatic cover. Alternatively, you can make the switch by coating conducting carbon ink on two small pieces of a copper-clad board. Circuit diagram : Simple Mat Switch Circuit Diagram When the circuit is in standby mode, transistor T1 does not conduct, since its base is floating. When the person walks, the switch is pressed and current flows through R1 and the switch to provide positive bias to transistor T1. Transistor T1 conducts and its collector voltage drops, which acts as a negative trigger input for the monostable wired around IC NE555 (IC1). IC1 outputs a pulse of fifty-seconds duration with preset values of R4 and C3. This...

IC 555 timer tester is a simple circuit that serves to test the condition of IC 555. 555 timer circuit tester, in principle, start the timer 555 in astable multivibrator mode. As an indicator of the status of the timer 555 good condition or damaged to use 2 pieces LED which will light up in a blink alternately when the timer 555 in good condition.  And only one will turn on or off all the timer 555 when the condition is broken. 555 timer circuit tester is powered using 9 Volt DC voltage source. Complete circuit tester 555 as follows. Tester schematic How to use 555 timer tester is in conjuction with IC 555 to test the existing IC socket according to the orderbutton. Then activate the power switch to begin testing the 555 timer ic. Then live we observe the LED indicators 2buah before, whether flashing alternately (good) or not blink or even die all (timer 555 damaged).

Well, hopefully, you aren’t tired of hearing about the Galaxy Note II yet; Samsung has finally made their announcement and released the official details. The leak earlier this morning pretty much had it nailed, but let’s go through the list now that it’s official. Naturally, the screen is the highlight here. It’s an enormous 5.5-inch HD Super AMOLED display at 1280×720. Early hands-on are showing that, while it is perhaps not quite up to the caliber of the HTC One X screen, it is a vast improvement over the Pentile displays we were seeing previously. The other signature feature is the S pen. The handwriting experience in general and that has been upgraded, as well. The pen itself is a bit larger, making it easier to handle, and the digitizer in the Note II supports 1,024 levels of pressure sensitivity–4x that of the original. Powering the Note II is a 1.6 GHz quad-core Exynos processor with 2 GB of RAM. I can’t imagine that won’t be sufficient to keep things humming along. The battery ...

This Pb137 charger circuit electronic project can be used for charging lead acid battery. Using the PB137 voltage regulator circuit and some other electronic parts can be designed a charger which is capable to provide 1.5A at 13.7 volts. PB137 is designed by ST Microelectronics in a TO-220 package and is a complete constant voltage battery charger with reverse polarity protection , over temperature protection , over voltage protection and short circuit protection . PB137 Charger Circuit diagram

 Nokia Universal Secret Codes: Note: All codes donot work for all models. Code Description            These Nokia codes will work on most Nokia Mobile Phones (1) *3370# Activate Enhanced Full Rate Codec (EFR) – Your phone uses the best sound quality but talktime is reduced my approx. 5% (2) #3370# Deactivate Enhanced Full Rate Codec (EFR) OR *3370# ( Favourite ) (3) *#4720# Activate Half Rate Codec – Your phone uses a lower quality sound but you should gain approx 30% more Talk Time. (4) *#4720# Deactivate Half Rate Codec. (5) *#0000# Displays your phones software version, 1st Line : Software Version, 2nd Line : Software Release Date, 3rd Line : Compression Type. ( Favourite ) (6) *#9999# Phones software version if *#0000# does not work. (7) *#06# For checking the International Mobile Equipment Identity (IMEI Number). ( Favourite ) (8) #pw+1234567890+1# Provider Lock Status. (use the “*” button to obtain the “p,w” and “+” symbols). ...

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There are components that have special characteristics , one of them is the 1N4148 diode , it is a diode High - speed , and its switching speed is 4th , its voltage is 100 V and current of 450 mA . It besides a diode 1N4148 is used as the temperature sensor , that due to its characteristics that cause it to change its resistance with temperature change . Of course it does not compare to a sensor like the LM38 , but for some circuits of low precision , which just need to know if an element is hot or cold it is very useful .   Temperature Sensor Circuit using 1N4148 diode Diagram Using the multimeter and the 1N4148 as a thermometer The scheme above is a circuit that measures the temperature in a simple manner using a multimeter. It uses 1N4148 diode , and VR1 and VR2 must be adjusted with a thermometer , and is more precise measurement . On the scale of the multimeter can be compared to the scale of degree...

4.2.5 Silver oxide cell Similar in appearance to mercury cell, silver oxide cell provides a very stable and slightly higher e.m.f., 1.5 volts as compared to 1.35 volts of the mercury cell. Silver oxide cell’s cathode is made of silver oxide, with potassium or sodium hydroxide, both strong alkalis, as the electrolyte. The capacity of the silver oxide cell, size for size, is considerably better than that of the mercury cell.  Silver oxide cell Because silver is expensive, this cell’s application is thus limited for applications where size and stability of voltage is of supreme importance, such as in  watches and hearing aids.

RF Generator 6 GHz Circuit Diagram. When we talk about high-frequency, everything seems to be difficult, a simple coil becomes a feat. Doing a search on the Internet found that generator "comb" (comb generator), which is a signal generator that produces multiple harmonics of your input signal. The appearance of the output on a spectrum analyzer resemble a comb, hence the name. Comb generators are simpler to build and seem to work well up to 1 GHz This generator I found surprised me because he was 6 GHz has a crystal oscillator 96 MHz (third overtone), capacitively coupled to a broadband amplifier using IC mar3 and capacitively coupled to a back-to-back diode set low capacitance PIN. According to the creator of this circuit was originally designed to produce a reference signal in the amateur radio band of 2.4 GHz, hence the 96.013 MHz crystal RF Generator 6 GHz Circuit Diagram

Zapper Refurbisher Ni-Cad Battery Circuit Diagram. Batteries and Nickel Cadmium, or simply Ni-Cad NiCad NiCd or sometimes do not work as expected, has no voltage or current, can not be recharged, it means that the battery is internally shorted or partially damaged. You can retrieve this battery in many ways, either by chemical or electrical recovery. One is simpler and recondition the Ni-Cad battery using a zapper circuit. This circuit restores the Ni-Cad battery short circuit, forcing a high current flow to burn the dirt inside. The resistance of 120 ohm per 10W is used to limit the load current of the capacitor. After zapping the battery goes to the load position, the charging process will take a long time and is indicated by the LED, which will gradually increase the brightness intensity until stable, so when the battery is fully charged. The power supply for the circuit can be made ​​from a small transformer 350 mA to 1 A with a half-wave rectifier or full wave. Zapper Refurbish...

DC-DC step-up part of the circuit RU190N08 Power circuit board SPWM drive plate TDS2285 IC

Low-Cost Electronic Project of RF Synthesizer Uses Generic ICs . You can design a hardware-based frequency synthesizer with one inexepensive IC and a few passive components. Such synthesizer chips are not always available, however, because they are typically single-sourced and are not in stock with parts distributors. The need for a working circuit in a short time and using common parts prompted the creation of the circuit in this Design Idea. The synthesizer covers the US commercial AM (amplitude-modulation) broadcast band. It tunes in 10-kHz steps from 500 to 1800 kHz, but you can scale the frequencies for other applications. The PLL (phase-locked loop) time base is a 100-kHz, tuning-fork-cut crystal of the same size as those in wrist watches. Using a more common crystal requires some extra parts to scale the frequency. Note that if you attempt to use one of these tiny crystals with a CMOS gate oscillator circuit, however, the circuit will either fail to start or exhibit visible jit...

This simple device allows two computers to share a single USB printer or some other USB device, such as an external flash drive, memory card reader or scanner. A rotary switch selects the PC that you wish to use with the USB device, while two LEDs indicate the selected PC. The most common way to share a USB printer between two PCs is to use one machine as a print server. However, that’s not always convenient because it means that the server PC must always be on if you want to print something. Picture of the project: That can be a real nuisance if you just want to quickly fire up the other machine and print something out. It also means that the two PCs must be networked together, either via a hub/router or directly via an ethernet crossover cable. Another way is to use a dedicated USB print server. However, as before, this must be connected to an ethernet network, along with the PCs. Such devices also need their own power supply, generally cost well over $100 and are overkill if you jus...