Top Circuits Page 224
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This is a HiFi pre-amplifiercircuit diagramwith low noise output. Very wide range frequency from about 10Hz until up to 100Khz will be gained by this preamplifier for maximumaudioperformance...
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A unit which is often very useful, if we need to isolate, in sound circuits, two stage between them. Then we can use this circuit which has an amplified unit, which gain X1, we do not use total negative feedback, only local, with the result that distortion....
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This circuit can does all that if you: Hate the volume your wife sets the stereo at, Don`t like your little brother`s TV channel selection, Want to just annoy someone and more by jamming most IR remote signals. Component: Ceramic Capacitor, Electrolytic....
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This LED thermometer is designed for in home use, to read temperatures between about 60 and 78 degrees Fahrenheit. It is based around a precision temperature sensor IC, the LM34DZ. This sensor require no calibration and can measure temperatures of between....
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This power monitor device provides accurate voltage and current monitoring of positive supply rail from 7V to 80V through a simple I2C interface, according to the datasheet. Such in automotive which has monitoring power in high transient environment, this....
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This low noise microphone amplifier is build with MAT02 produced by PMI. This mic amplifier is very performant and has a verylow noise level. The amplification can be 20dB or 23. 5dB (10x or 15x ) selected by S1. We aim to transmit more information by....
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This device has 24 milliwatts quiescent power drain when operating from 6 V supply in which making the LM386 ideal for battery operation. It is stated in the application hints section ofLM386 datasheet, there are two pins (1 and 8 ) provided for gain control....
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This is a general purpose remote control project with using programmable PIC microcontrollers (PIC16F628, PIC16F630, PIC16F684). Schematics are shown for using infrared (IR) or radio (RF) media. If you are not familiar with microcontroller programming, you....
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Used this circuit once to track down the location of a plastic pipe, buried underground. It transmits a weak RF signal, which can be picked up by a portable AM radio from about 6 feet away...
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This circuit be signal sound expansion from condenser microphone give with small-sized loudspeaker. It compose the importance is part pre mic use transistor just one enlarge sound signal gives the power goes up change come to a part amplifier with the....
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Nothing in this project is real original, but I did do a couple of modifications from the circuits I saw. The fellow that started this, as far as I can tell is Jack Bryant, KE4ID with his one tube superhet contest radio project. That was my basis for this....
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The TDA7000 is a monolithic integrated circuit for mono FM portable radios or receivers where a minimum on peripheral components is important (small dimensions and low costs). The IC has an FLL (Frequency-Locked-Loop) system with an intermediate frequency of....
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The following circuit diagram is a simplified application circuit of the TDA8932B/33(B) device when operated from an asymmetrical supply (single supply). Here`s the circuit diagram: To simplify the design for an asymmetrical supply in SE configuration, the....
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A simple but effective fixed gain transformerless microphonepreamplifier circuit diagramin the picure below. The circuit amplifies differential signals from low impedance microphones by 50 dB and has an input impedance of 2 kOhms. The OP27/37 operational....
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3D enhancement is needed to create a fully 3-dimensional sound for most stereo multimedia products. Usually, simple phase-delay circuits is used to produce a widening effect on the perceived sound field. However, there is transaural acoustic crosstalk....
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This article describes the DDDAC 2000 Audiophile projects (1N4001). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy....
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The schematic below shows how the +25V DC and -25V DC are obtained. In order to provide power supply for 2 stereo amplifiers, a power transformer rating of 80VA with 240V/36V centre tapped secondary winding is used. The secondary output of the transformer is....
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This EEPROM programmer reads, writes and erases 24C EEPROM devices. It has a PC serial port interface. The programmer needs 5VDC power supply. It can read or write one page (16 bytes) at a time by programming the page with a terminal program such as....
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This article describes the Teralab Electronics projects Robert Hunt (2N2222). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find....
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This article describes the Flip-Flop Flashers, Buzzers CIRCUIT (2N4401). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and....
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This simple AVR Programmer able to transfer hex programs to mostATMEL AVR microcontrollers. It is more reliable than most other simpleAVR programmers available out there and can be built in very shortamount of time. This Programmer support the AVR....
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This article describes the Gadgets Gizmos and Arduino (ATMega328). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy....
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This simple diode modulator delivers excellent results when used for high percentage modulation at low signal levels. Constants are shown for a carrier frequency of about 10 MHz, but, with a suitable tank, the circuit will give good results at any frequency....
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This article describes the Low dropout voltage regulators circuits (LF353DRG4). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to....
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This article briefly describes the NTSC-PAL TV Signal Identifier (LM1881). Although this circuit is very easy to understand, but also very practical. Circuit elements in depth understanding of the grasp of the principle is very effective. Do you know the....
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This article describes the The 555 Timer Design (NE555N). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these....
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This article describes the Lammert Bies - Computer Interfacing (RS485). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and....
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This article describes an amplifier Audison LR604XR principle. The principle is simple there, we recommend that combine text carefully read the complete schematic. To better grasp this principle, it is recommended to read several times on this principle. 1.....
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FM Stereo decoder using TDA7388A very simple with a compact design FM stereo decoder schematic circuit can be designed using the TDA7388 IC manufactured by ST Microelectronics. The TDA7338 is a monolithic integrated stereo decoder with noise blanking for FM....
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Circuit The circuit diagram of window foil burglar alarm has been published here. The main parts of this circuit are SCR H1 (TYN 612) and transistor Q1 (BC 107). This burglar alarm can be fitted in windows to check breaking attempts. Here the sensing element....
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Inverter or ondulator, is an electronic circuit used to turn direct current (DC) into alternating current (AC). The function of an inverter is to change the voltage of entry of direct current (it normally comes from a battery of 12 or 24 Vdc) to an alternate....
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To build astepper motor tester, the circuit contains two sets of drivers that can support both unipolar and bipolar stepper motors. The control circuit and driver circuit are in separate power supplies that can work on a wider rangeof different power....
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With pulse operation, the solenoid is energized momentarily with five to six times its rated voltage, then held in with less than half of its rated voltage. Application time is reduced drastically and the reduced holding voltage produces less arcing when the....
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The second program just sends "Hello world" to the PC. By default my board uses the Virtual COM Port (VCP) driver so you can view the output using Hyperterminal or similar program, I recommend PuTTY. The setup is quite simple, when I plug the PCB into my PC,....
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A MOSFET solid state kilowatt amplifierplifier using MOSFET`s. Helge`s work was followed by articles that appeared in QEX and QST by Joel F. Paladino, N6AMG. Since then, very little has been written in amateur radio publications concerning MOSFET`s in....
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It`s a single integrated circuit with EEPROM, Ram, Analog to Digital converter, a lot of digital input and output lines, timers, UART for RS 232 communication and many other things. The best is however that a complete programming environment is available....
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Here is an example which implements a clock in just 36 lines of perl code. It displays time and date and the upper right corner shows a little icon called "heartbeat". The "heartbeat" is added by the LCDd server. This "heartbeat" icon blinks once in a while....
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The first time you sign into developerWorks, a profile is created for you. Select information in your profile (name, country/region, and company) is displayed to the public and will accompany any content you post. You may update your IBM account at any time.....
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The first time you sign into developerWorks, a profile is created for you. Select information in your profile (name, country/region, and company) is displayed to the public and will accompany any content you post. You may update your IBM account at any time.....
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water drops. I`d always been drawn to time-lapse and macro photography, and it seems that the obiquitous water-drops are a common first step into this strange and wonderful photographic world. In researching it further however, it quite quickly became....
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The Universal Serial Bus (USB) has become a ubiquitous technology for computer peripherals. It is available on virtually every new computer and in most cases provides a seamless connection method for a variety of consumer electronics devices such as digital....
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This is a design project of an air-filter sensor to be used in home heating and cooling system. The project includes conceptual design, analysis, implementation, tests and modifications. First, the air quality and power consumption between a clean air filter....
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This is an implementation of the L298 to drive motors and inductive loads up to 4A continuously. Initially the L298 contains two separate channels, each one capable of driving 2A loads. Connecting them in parallel as in the schematic makes a single 4A....
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This circuit will convert a positive voltage to a negative voltage, while losing 1. 5 V (approximately). For example, if you`re supplying 9V to the circuit, the output will be -7. 5 V. This circuit can also be used as voltage doubler, by using the output as....
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Based on the famous AT89C52 microcontroller, this 500 Khz frequency-Meter will be enough to trace and debug most of your circuits, to adjust 555 timers frequency and perform all kind of frequency measurements in Digital circuits. And once you have this tool....
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This article aims to introduce to beginners and intermediate readers a simple solution to build a digital to analog converter, based on the famous r/2r resistors network. This article also discuss a problem encountered by many beginners while trying to build....
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A relatively High power H-bridge motor controller (which is the most common way to control DC motors) With cheap TIP transistors. 5 Amperes of continuous current through an H-bridge module may not seen high power to someof you, depending on your field and....
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ISP is a way to serially program your microcontroller, while it resides in its place, in other words, without removing the chip from your board. Whether you`re just starting in the ATMEL microcontrollers, or you`re familiar with it, ISP (In System....
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This circuit will provide electric power from a backup battery when AC power is cut, always providing a clean 5V power supply for sensitive equipment like microcontrollers and logic circuits. The value of C1 is to be higher than 220 µF. The bigger the....
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The first test circuit (see figure 5) is about the simplest circuit that can be designed around the device. The sensor is drawn in the schematic as if you are looking through the top of the sensor to the 12 leads below. The circuit uses four LED`s for....
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To activate the air muscle, valve labeled #2 is opened. This causes the air muscle to contract. Once activated the #2 valve may be closed without impacting on the state of the air muscle. The air muscle stays in a contracted state. To relax the air muscle,....
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The schematic is shown in figure 10. The circuit can be hardwire onto a breadboard or you can purchase a pc board, see figure 11. The LCD display used is a 2 line by 16 character display. You can use an LCD module with a Hitachi 44780 controller or....
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The basic Geiger counter circuit is identical to the previous circuit. The revision is the adding of the components for our three optional enhancements; external power input, headphone jack and digital output, boxed in red. External Power – The external....
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In our first program, we will simply sweep the servomotor from CCW to CW and then sweep back. The program will be kept simple as to demonstrate the priniciples of controlling a servo with a the PIC Basic language. The schematic can be seen in figure 2....
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Using a modified version of the last program, we can control as many servomotors as we have I/O lines on port B. In the next listing, we will control two servos in the same manner as we controlled a single servo in the previous program. The circuit is shown....
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The optimum duty cycle and frequency for the strobe photoperiod needs to be determined. In other words we`re flying blind in regard to optimum frequency and duty cycle. The circuit I designed is 3Hz with a 50% duty cycle. I chose this frequency based upon....
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The circuit is based on the PIC 16F877 microcontroller, see schematic in figure 4. The digital display output of the speech recognition circuit connects directly to the pins of the microcontroller. The LED in, provides a trigger that informs the....
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Analog Geiger Counters are useful for detecting radioactivity and performing nuclear experiments. The GCK-01 model has numerous customizable options and comes as a ready to build kit. These Geiger Counters primary indicators are an audio click and an LED....
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The overall task of the optical receiver is to extract the information that has been placed on the modulated light carrier by the distant transmitter and restores the information to its original form. The typical through-the-air communications receiver can....
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