New Circuits Page 90
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Digital Step-Km Counter. Max. range: 9,950 meters with two digits. Slip it in pants` pocket for walking and jogging. Circuit diagram: Parts: R1,R3 22K 1/4W...
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The magnetometer was moved to an outdoor location and a specialized enclosure was built. An accessory temperature controller was included to maintain a constant temperature and digital link was created to ferry the recorded data back into the laboratory.....
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This dimming controlled LED driver electronic circuit require an input voltage of 36 volts and will provide at output a voltage of 24 volts at a maximum current of 700mA ..
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The primary goal for this project is to utilize the 555 timers to detect a motion in the nearby environment. The output of this circuit will light LED and make an audible sound like an alarm...
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While working on an Electricity/Electronics exhibit for the Museum of Science in Boston I discovered a number of serious problems in attempting to explain simple electricity. One problem was the obscure way that exhibit devices typically present electrical....
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This be the circuit sets the time to model is simple,at can fix the time had long ago and have tall good accuracy. By use pillar equipment be IC CA3140 for....
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The above picture is the motor control circuit composed of LM339 etc.When the input control signal is high PWL,comparator A and A3 make power amplifier conduct composed of A4,VT5 and VT6 and it drives motor M.At the same time,comparator also outputs and....
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In some cases, appliances and equipment are able to operate when supplied by two different levels of AC line voltage to their main terminals (120 V or 240 V). This is why, it is very common that appliances and equipment have mechanical selectors or switches....
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The main part of this circuit is the LM386 amplifier chip. It also uses a transistor input to buffer the input signal and provide extra gain for the LM386. The little unit has helped me out on numerous occasions when trouble shooting any amplifier circuit....
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A fan speed controller for your computer fans. There are two sections: one for manual speed control, and one for automatic (temperature dependent) speed control. There is also a third section for a simple LED output indicator. Why not just run the fans off....
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The original smoke alarm circuit has some problems and has left some hobbyists and students disappointed. Rather than to attempt to solve its many problems, I have created an update that uses the venerable LM741 op amp. It is simpler, more conventional,....
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As shown in the figure is the traditional three-phase bridge type inverter circuit:VT1?VT6 is thyristor, L1?L6 is commutation reactor, C1?C6 is commutating capacitor, the thyristor shut-off circuitconsists of the two parts. VD1?VD6 is feedback diode.....
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Here is a able ambit of IF arresting architect which may be of absorption to radio hobbyists and professionals alike. Transistors T1 and T2 anatomy an astable multivibrator aquiver in the audio abundance ambit of 1 to 2 kHz. RF oscillator is congenital about....
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A PING Ultrasonic Range Finder to build up a system which is capable of detect and measure the distance (in mm unit) of the closest object in front of the sensor. It is like a digital measuring tape where you point the sensor to an object, press the read....
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A simple and cheap Laser Based Security System, which costs below Rs. 100. It is a simple circuit using LM358 OP-AMP and LM555 Timer. This circuit is triggered when the Laser beam falls on the LDR interrupts, which sounds the buzzer connected to it. This can....
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A very simple telephone broadcaster or transmitter which can be used to eavesdrop on a telephone conversation. The circuit can also be used as a wireless telephone amplifier. One important feature of this phone transmitter is that the circuit derives its....
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In this USB circuit using an IC as a modifier of digital voice data into analog so that it can be applied to a headphone, or again through the power amlplifier strengthened so that it can be heard through the speakers. IC used in this circuit using IC....
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This Idea for Design describes a 12-V dc to 5-V dc (±5%) switched-mode power supply (SMPS). The supply uses a 12-V input from an array of four 3-V dc, 40-mA solar cells connected in series..
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This oscillator uses a very large capacitance-to-inductance ratio. L1 is a one-tum coil consisting of a loop of #12 wire 12 in diameter. This circuit is useful for metal detectors, etc., where a loop antenna is used....
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Sinusoidal pulse width modulation (SPWM). I`ve discussed about how to generate the sine table, how to implement it, how to practically generate the SPWM signals (with example code) and also how to implement feedback with simple sine table manipulation with....
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Apart from the obvious usage as a headphone amplifier, the circuit can be used for a range of applications where a wide bandwidth low power amplifier is needed. The circuit is based on an opamp, with its output current boosted by a pair of transistors....
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In this circuit a LM339 quad voltage comparator is used to generate a time delay and control a high current output at low voltage. Approximatey 5 amps of current can be obtained using a couple fresh alkaline D batteries. Three of the comparators are wired in....
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A simple schematic detailing a 15Hz zapper with correct component values....
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This a two station intercom. It uses two wires to run between each intercom unit. Each is self contained with its own battery, speaker, microphone and amplifier circuit. An LM386 audio power amplifier is used. It is widely available, used a....
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Stepper motors are a subject that keeps recurring. This little circuit changes a clock signal (from a square wave generator) into signals with a 90-degree phase difference, which are required to drive the stepper motor windings. The price we pay for the....
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I`m working on a battery operated tesla coil and im completely stumped on how to convert the dc to ac to power my hv transformer....
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The article presents a circuit that can be used for indicating the riding speed of a bicycle. The circuit of a bicycle speedometer explained here uses ordinary components like transistors and LEDs and yet succeeds in displaying a distinct 10 step, accurately....
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Working principle: Two pairs of photoelectric detection devices are installed in the access channel. On one side the light source A (transmitter) and the photoresistor LDR1 (receiver) are installed in the entrance of the channel; on the other side, the light....
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This FSK demodulator convert the FSK signal to serial digital signal. FSK modulation is used to transmit digital serial data, and we need to demodulate it to...
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The servo motor have many utilizes in everything from robotics to puppetry to photography and beyond. These tiny motors can position their output shaft to any position on command and hold that position. Most servos possess a range of motion to about 210....
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Red = V+, Black = V-, Green = GND, Yellow = Mic Input, Orange = LED Output. The op-amp I`m using is an LM741. It`s supposed to change the peak brightness of the LED depending on the ambient sound level. The frustrating thing is that the simulator is happy....
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Using Nokia 2300 for my project and the original earphones that came with it. They work properly when listening to radio, or talking to someone over the phone. However, the MT8870 IC does not give output when I connect it to my AT89S52 microcontroller. I....
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It was one of those days that you should learn some chemistry, philosophy and literature. So I thought something like what am I going to do today I started a project I did want to make for a longer time, but for what I never could find the time and....
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Cheap motorcycle alarm circuit. During parking, hidden switch S1 is normally open and will not permit triggering of MOSFET T1. But when somebody starts the motorcycle by using ignition switch S2, MOSFET T2 triggers through diode D1 and resistor R5. Relay RL1....
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a regulated and noise free power supply voltage for the microcntroller and other components like amplifiers, filters and GPS etc. , otherwise a voltage surge generated in the voltage being fed to the microcontroller and other components may permanently....
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The circuit is intended for carrying out harmless experiments with high-voltage pulses and functions in a similar way as an electrified fence generator. The p. r. f. (pulse repetition frequency) is determined by the time constant of network R1-C3 in the....
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By looking at the layout of the PC board, decided to insert a stereo 3mm canceling type jack (5 pin) at the volume control chip inputs, and mounted it on the front panel. Did not find such type of jack in my parts bins, and canibalized one out of a old PC....
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This circuit has a focused optical sensor to transmit light to the CO reagent, and then sense the amount of light reflected. The reagent for CO detection darkens from a light yellow color when exposed to CO. According to the card`s manufacturer, a....
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A very simple piezo electric buzzer using hardly any electronic components. Just a single transistor, a coil, a piezo buzzer are enough to make it buzz or rather twit for you, with an output that may be quite ear piercing. The simple buzzer circuit....
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I used some schematics from Elliot sound products to help with this circuit. L-In and R-In come straight from the speaker terminals, +ve and -ve are +25 and -25 volts from the power supply. When the circuit detects DC, transistor 2 is turned on and the 25....
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Model railway running under computer control using the laptop to send commands over the USB port to the Arduino, which then does PWM to control the speed of the train. There were a few hiccups along the way not least of which the Arduino crashed repeatedly....
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The most essential accessory for astrophotography, after a camera, scope and mount, is a remote shutter release to reduce vibration. A remote control is even more useful if it can trigger a series of exposures at preset intervals and of preset duration. With....
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This sound level measuring device circuit can live used to control the intensity of a sound recording before in the field of a disco. It has 5 measurement domains connecting 70 and 120 dB; recital accuracy is 0. 5 dB. Microphone M1 is used to receive the....
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A two transistor circuit that flashes two LEDs on and off alternately. This tutorial shows beginners in electronics how to build the easy circuit on breadboard....
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When the circuit is connected to the hi-fi equipment or at both ends of the electronic instruments speaker, the audio level can be modulated to 500W lamp by proportion. Using 3 appropriate sets of audio filters and 3 different color light Union microscopy to....
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You can use any PIC microcontroller that has an ADC and enough memory to hold the program. The LED is pulsed after every ADC acquisition to indicate that the processor is alive - so you can tell if the software is active. You can recompile the lcd volt....
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The 30 watt amplifier circuit shown below provides an appropriate power boost with an input of 4 watt up to 6 watts. The circuit is designed to cover 88-108MHz FM Broadcast Band. However, the circuit is very stable at my place and provides a clean-output....
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This circuit divides a 10 MHz reference to 1, 10, 100 or 1000 pulses per second. The pulse width is also jumper selectable with lots of choices. A sync input will align the pulses with an external pulse, say from a GPS receiver. The outputs are hiding over....
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A sensor project which transmits it`s measurements via a 433Mhz wireless communication link. On this page I will describe the details of my self built receiver which receives data from this sensor. To build a general purpose RF receiver module which receives....
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Here is a schematic of FM, AM/MW and SW antenna amplifier circuit or we can also say it antenna preamplifier circuit which can be used to increase the faint signals of FM, AM/MW & SW bands. The circuit is very simple and easy to build using only one....
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Although the modular Portable Mixer design available on these web pages has become a hit for many amateurs, some correspondents required a much simpler device, mainly for mixing mono signals. This design should fulfil their needs, featuring three inputs with....
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The purpose of this circuit is for research and education. If anyone knows where I can get parts for simple RF circuits or even a tutorial or schematic that would be really appreciated. Honestly guys, I know you are all probably annoyed with this question....
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Atmega 8535 Color Conversion to Frequency, the technology of instrumentation that can recognize of colors or also known as color sensor, is very urgently needed in the field of industry. This sensor has a lot of its usefulness as for the paint industry until....
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Solar energy has now become a popular alternative for the production of electricity. Here is a green energy project for school students on how to make solar lamps for your home. The main component of this simple solar lamp circuit is a small solar panel and....
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This circuit controls five outputs 220V. Potentiometer change speed and a switch select effect (one direction or both directions). The circuit has a divider by 10 (4017), a transistor oscillator (2N2646), the power stage and power supply. Each pulse on pin....
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The "cold electricity" is actually RF frequency AC. When you have sinusoidal AC the voltage is half the time positive and half the time negative. On a scope you can see this, but on a voltmete..
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A sequential timer circuit device are used in many applications for initializing conditions during start-up or for activation of test signals in sequences such in test equipment device. The circuit diagram below shows a sequencer circuit with possible....
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This LM3909 circuit produces a rapidly rising wail upon pressing the button, and a slower "coasting down" sound upon release. If it is desirable to have the tone stop sometime after the button is released, an 18-k © resistor can be placed between pins 8 and....
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This TV transmitter transmits audio and video signal from Camcoder Camera, DVD, VHS, Satellite, video game, etc. Playing them in a channel free from the strip of VHF. These signal can be radiated with a common antenna and captured in an it distances of until....
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This circuit is describes about sensing air flow using microcontroller PIC16C781. In this circuit is using Programmable Switch Mode Controllers (PSMC) that combination between the Integrated Operational Amplifier, Digital-to-Analog Converter (DAC), and gated....
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The AVR 8-Bit RISC microcontroller from Atmel is a very common microcontroller. This microcontroller is one chip with EEPROM, Ram, Analog to Digital converter, a lot of digital input and output lines, timers, UART for RS 232 communication and many other....
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A possible source of quiet and limitless energy for submarine propulsion. It will be noted that this hexagonal construction of coils and magnets and two "rotating" sub-circuits has absolutely no source of power. Yet, to the mystified Coler and Dr. Schumann,....
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This 300W RF power amplifier for your fm transmitter has 2 x TP9383 transistors. 300W radio power amplifier for 88 - 108 MHz band. 300W RF power amplifier....
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Cost, size, resistance, and current capability drive the choice of inductor for most stepdown dc-dc switching converters....
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This is a 6m band transmitter RF power amplifier (50 MHz) with 100W output. It used with my FT-736R and drive from 10W for the 6m SSB DX. The Building information comes from Japan CQ Magazine. The Toshiba RF bipolar power transistor is used in it. If you....
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To know whether it is freezingyou only need tomeasure the temperature. This has to be done accurately, of course, and therefore we need to choose atemperature sensorthat we have some confidence in. The choice has again been made for a type that we have....
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This circuit uses an MC3392 low side protected switch and an MC1455 timing circuit to form an automotive instrumentation panel lamp dimmer control. The brightness of incandescent lamps can be varied by Pulse Width Modulating the input of the MC3392. The....
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This option has the advantage that one does not need to change anything in the receiver itself. However, since any filter will give some attenuation of the signal, this will degrade the noise figure of the receiver, and thus limit the weakest signal which....
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This is a distillation of my " design notes ", with more practical details as I move along with the construction, and (in due course) some pictures. Right at the moment I`m using it as a kind of progress report for myself - it`s a mixture of immediate plans....
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This is a luminous flux test circuit with optical resistors. In the circuit, the optical resistor RG forms a bridge with RP1,RP2,R1 and R2; RP1 is used to adjust the balance of the bridge; RP2 is used to adjust the sensitivity of the circuit. If we adjust....
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The Arduino Internet Gizmo is a USB, Arduino, and RFID device for web surfing. The gizmo works by placing an RFID tag on the top of the gizmo. The gizmo reads the RFID tag and sends the tag number via USB to a program running on a PC. The program looks up....
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The sphygmomanometer can roughly be divided into two kinds at present: First, mercury sphygmomanometer, steady for number value advantage its, shortcoming its operate by oneself for unable one, must be professional the medical personnel operates, and the....
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A simple single-transistor Colpitts oscillator whose schematic is shown in figure 2. When a vehicle passes over the loop the inductance decreases and the oscillator frequency increases. A microprocessor which measures the oscillator frequency and takes....
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A block diagram symbol is used to represent the PCB schematic on block connection diagrams. The following diagram shows the block diagram and the circuit that it represents. Any number of signal blocks can be connected in series. To be able to show all of....
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With this cool circuit integrated to your cars headlight system, you can drive cool headed in high beam. The circuit will take over the duty of low beaming the headlight when vehicles approach against, and high beams the lights when they pass over. The....
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The PIC18F4550 chip contains more features than the PIC16F including a module for USB communications. There is some added complexity. The first issue to resolve is which chip to order. The PICSTART Plus will program the 40 pin PIC18F4550-I/P chip. The....
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Can be used for Touch-Tone decoding as well as for telephone-line and wireless control applications using single audio frequency. Operating center frequency depends on H1 and C1. R1 should be between 2K and 20K. C1 in microfarads is computed from f = 1/R1C1,....
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Whenever AC mains supply fails, this circuit alerts you by sounding an alarm. It also provides a backup light to help you find your way to the torch or the generator key in the dark. The circuit is powered directly by a 9V PP3/6F22 compact battery. Pressing....
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To create the circuit you will need to connect a switch as an input and an LED as an output to the Arduino. This means that you will need a switch, an LED, a 10k © resistor, a 470 © resistor, a blue or yellow jumper wire, and a red jumper wire. The Arduino....
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The requirement was to add a digital readout to an otherwise manually bend roller machine so that we could accurately monitor the amount of material fed into the machine. The readout should be simple to use, require no setup other than initial calibration....