AT89s51-52 and AVR USB Downloader

Microcontroller T89s51, AT89S52 and AVR is an idol among students. Well now because of technology trends and laptop PCs already left the LPT and COM so more and more difficult to download the firmware into the microcontroller, via LPT or COM. Solutions to be overcome with AT89S S-series, because the facility program downloads with the...

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Rangkaian Pendeteksi Angin

This circuit uses an incandescent lamp to detect airflow (mendeteksi angin). With the filament exposed to air, a constant current source is used to slightly heat the filament. As it is heated, the resistance increases. As air flows over the filament it cools down, thus lowering it's resistance. A comparator is used to detect this difference...

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Stepper Motor Controller using IC 4027

The stepper controller circuit is very interesting, since most lines the step motor controllers are very expensive. The circuit is made ​​of standard components and can easily be adjusted by a computer. If you cheap surplus transistors and stepper motors, the price of the circuit can be less than $ 15. Stepper Motor Controller Circuit...

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Ukuran Box Subwoofer 10"

This subwoofer box was created to match and aid the 1.618 Hi-Vi 3-way tower loudspeakers. The main focus of the HiVi 10" subwoofer was to reproduce ultra low frequencies that the 1.618 could not reproduce and aid in overall low end musical reproduction. Low, flat and not "boomy" was priority one. This subwoofer project uses the 10" subwoofer...

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4,8W Class-A MOSFET Amplifier

This is very simple Class-A 2SK1058 MOSFET Amplifier circuit. It is easy to build it, Must use supply volte 24V at high current. It produces the most purest sound. I have no idea of distortion levels etc. but it has a very fine grain, and delicately textured quality.Skema Rangkaian 4,8W Class-A MOSFET AmplifierThis is one package 2SK1058...

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LM383 - Car Audio Amplifier Circuit

Circuit schematic shows the circuitry for a Class B amplifier with 8 Watt output, based on the LM383 chip. This amplifier circuit suited for automotive applications. High current capability (3.5A) en-ables the device to drive low impedance loads with low dis-tortion. The LM383 is Current Limited and thermally protected. High voltage protection...

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Rangkaian Power Amplifier Blazer 1000 Watt

This is a audio power amplifier Blazer circuit provides up to 1000Watt . This interesting routes many good bass and treble alive. Importantly should choose Power supply source, which has been fairly high voltage class 70Vdc GND -70V 10A is the current low levelSkema Rangkaian Power Amplifier Blazer 1000 WattThe transistors are 2SC3858 (NPN)...

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500 Watt Inverter 12VDC to 220VAC

The circuit of 500 Watt Inverter 12VDC to 220VAC is made using a transistor. central component of this inverter circuit is a configuration of 2 pieces of transistors Q1 and Q2 which form a circuit of Flip-Flop. The output of the flip-flop Q1 and Q2 then in severance for each pulse to complement each other using a compiled circuit by Q3...

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12VDC – 220VAC Inverter Using Cmos CD4047

This inverter circuit will convert 12V DC power from battery to 22oV AC as home power replacement. The inverter can be used for small electronic appliances such as lamp, radio, phone charger, disk player etc.Skema Rangkaian 12VDC – 220VAC InverterUsing Cmos CD4047CD4047 PinoutThe inverter circuit has a central component, the CMOS 4047,...

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Light/Dark Switch With Relay

The circuit as shown act as a light detector. Under normal conditions the resistance of the LDR is high, keeping pin 2 low. When light falls onto the LDR the resistance drops to a couple hundred ohms and triggers pin 2 high which biases the base of Q1 via pin 6 and R4 and in turn activates the relay.Light/Dark switch Circuit with relayAs...

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Refrigerator Door Alarm Circuit Using LDR

The alarm circuit enclosed into a small box is placed in the refrigerator near the lamp. With the door closed the interior of the refrigerator is in the dark, the LDR R2 presents a high resistance thus clamping IC1 by holding pin 12 high. When a beam of light enters from the opening, or the refrigerator lamp illuminates, the LDR lowers...

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Rangkaian 11-90 hz Subwoofer Filter Using TL072 Op-Amp

The subwoofer filter circuit allows the addition of subwoofers to an existing full-range system, offering adjustable low-pass filtering with optional R6 and R8 boost and mono-summing.Skema Rangkaian 11-90 hz Subwoofer FilterUsing TL072 Op-AmpTL072 Op-AmpThe Subwoofer filter circuit to remove for separate pre amplifier to drive the low...

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6 Band Graphic Equaliser Circuit Using 741 Op-Amp

This circuit is 6 Band Graphic Equaliser ,you can adjust sound in low ,mid and high which circuit used IC 741 Op-Amp. With this circuit you can control and blend frequencies and tones as desired.Essentially, the circuit consists of an IC 741 whose gain at various freguencies is determined by corresponding potentiometer setting.Skema Rangkaian...

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Rangkaian 400W MOSFET Amplifier

These amplifiers circuit can be used for virtually any application that requires high performance, low use Noise, distortion and excellent sound quality. Examples would be subwoofer amplifier should FOH stage Amplifiers, surround a canal a very powerful sound amplifier, etc. The 400W MOSFET-amplifier has four key stages of amplification....

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Audio Peak Level Indicator By Op-Amp

simple circuit PEAK indicator of foliage of the musical signal. This circuit was designed to provide a valuable test equipment tool for sound reinforcement systems like sound amplifiers and the like. The circuit is formed by an input buffer and ac to dc voltage converter (IC1A) feeding a window comparator (IC2A, IC2B, IC2C) which illuminates...

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DC Motor Controller Circuit Using 741 Op-Amp

This DC motor controller circuit using a 741 operational amplifier operating as a voltage follower where its non inverting input is connected to the speed and rotation direction of a potentiometer VR1. When VR1 is at mid position, the op-amp output is near zero and both Q1 and Q2 is OFF.When VR1 is turned towards the positive supply side,...

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Rangkaian 3V FM Transmitter

This 3V FM transmitter is about the simplest and most basic transmitter to build and have a useful transmitting range. It is surprisingly powerful despite its small component count and 3V operating voltage. It will easily penetrate over three floors of an apartment building and go over 300 meters in the open air.The circuit is basically...

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25V Capacitor Bank for OCL Amplifier

Rangkaian 25V Capacitor BankThe circuit diagram below shows how the +25V DC and -25V DC are obtained. In order to provide power supply for stereo amplifiers, a power transformer rating of 80VA with 240V/36V centre tapped secondary winding is used. The secondary output of the transformer is rectified by using four 1N5401 diodes together...

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35W Audio Amplifier Circuit by STK082

Here is a 35W audio amplifier circuit built based on single Amplifier chip STK082. This is a very simple amplifier, very easy to build and produce sound output with a fairly large power of 35 watts into 8 Ohm loads.Skema rangkaian STK082 - 35W audio AmplifierThis amplifier circuit is suitable for home power audio devices. The STK082 amplifier...

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Rangkaian Audio Surround Decoder

This circuit has been created to design a decoder circuit that will operate in a module that would produce an audio surround sound.Skema Rangkaian Audio Surround sound DecoderThe operation of the above circuits starts as the stereo sound signal transports surround sound information on the master volume part of the circuit. This will drive...

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Rangkaian Charger aki 6 Volt

Here is the circuit diagram of a low cost charger for 6 volt batteries. This circuit requires a regulated 10V-DC front end capable of supplying 2 Amps. Begins the charge period at 240mA and at full charge switches automatically to a float condition of 12mA. The capacitors should be the electrolytic 25V or greater.Skema Rangkaian Charger...

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100Watt Inverter Circuit by IRF44 Mosfet

This inverter circuit will provide a very stable 230V Output Voltage. Frequency of operation is determined by a VR1 and is normally set to 60 Hz. Various “off the shelf” transformers can be used. Or Custom wind your own for best results. Additional MosFets can be paralleled for higher power. It is recommended to Have a “Fuse” in the Power...

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12VDC to 220VAC Inverter Circuit Using IC 555

This is a simple 12VDC to 220AC inverter circuit that can be used produces an AC output at line frequency and 220AC or different voltage by selecting transformer T1. The 555 IC is configured as a low-frequency oscillator, tunable over the frequency range of 50 to 60 Hz by Frequency potentiometer R4.12VDC to 220VAC Inverter Circuit The...

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Smoke Detector circuit Using LDR

This is a simple Smoke Detector circuit based on a LDR and lamp pair for sensing the fire. It uses a very simple approach to detecting smoke in the air. The alarm works by sensing the smoke produced during fire. The circuit produces an audible alarm when the fire breaks out with smoke.Smoke Detector circuit using LDRWhen there is no smoke...

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Car Parking Sensor circuit Using Infra-Red LED

This circuit can be used for an assist in parking the car near the garage wall backing up Pls. LED D7 illuminates Pls bumper-wall distance is about 20 cm., D7 + D6 illuminate at about 10 cm. and D7 + D6 + D5 at about 6 cm. In this manner you are alerted Pls approaching too close to the wall.Car Parking Sensor circuit All distances mentioned...

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UM3561 - Simple Sound Effects Generator Circuit

This is a very simple. The IC UM3561 produces four differen sound effects, the output at Pin 3 being amplified by the transistor 2N2222. A 64 ohm loudspeaker can be substituted in place of the 56 ohm resistor and 8 ohm loudspeaker.Skema Rangkaian Sound Effects GeneratorThe 2 pole 4 way switch controls the sound effects. Position 1 (as drawn)...

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Op-Amp 6-Line Audio Mixer Circuit

As with any audio mixer circuit, a slight loss is always introduced. The final summing amplifier has a gain of 2 or 6dB to overcome this. The Input line level should be around 200mV RMS.Skema Rangkaian 6-Line Audio Mixer based Op-AmpThe mic inputs are amplified about 100 times or 40dB, the total gain of the mixer including the summing amplifier...

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Water Activated Alarm Using IC 555 Circuit

This Water Activated Alarm circuit uses a NE555 timer wired as an astable oscillator and powered by the emitter current of the transistor BC109C. Under dry conditions, the transistor will from have no bias current and be fully off. As the probes get wet, a small current flows Between the base and emitter and the transistor switches on. A...

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LM390 Simple 2-Way intercom Circuit

This is a very simple two way intercom circuit based on a LM390 audio amplifier circuit . the intercom circuit is a stand-alone electronic communications system intended for limited or private dialogue. For this circuit you can use a 8 ohms speaker, one for each station and require a 6 volts dc power supply. Gain control can be done by...

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Triangle and Squarewave Generator Using Op-Amp

The circuit shows a simple triangle and squarewave generator using a common LM1558 dual op-amp to produce very low frequencies to about 10 KHz. The time interval for one half cycle is about R*C and the outputs will supply about 10mA. Triangle amplitude can be altered by adjusting the 47k resistor and waveform offset can be removed by adding...

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Rangkaian Alat Bantu Pendengaran

This circuit, connected to 32 Ohm impedance mini-earphones, can detect very remote sounds. Useful for theatre, cinema and lecture goers: every word will be clearly heard. You can also listen to your television set at a very low volume, avoiding to bother relatives and neighbors. Even if you have a faultless hearing, you may discover unexpected...

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30W Mini Mosfet Amplifier

This mini mosfet amplifier project was a sort of challenge: designing an audio amplifier capable of delivering a decent output power with a minimum parts count, without sacrificing quality. The Power Amplifier section employs only three transistors and a handful of resistors and capacitors in a shunt feedback configuration but can deliver...

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9 Volt Portable Headphone Amplifier Circuit

Here I present a very simple and powerful headphone amplifier Circuit using NE5534/2 . In addition to the IC NE5534/2, the circuit uses only few passive components and can easily generate a lot of sound from even the most inefficient headphones and there will be no compromise for the quality. Circuit of 9 Volt Portable Headphone AmplifierThe...

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