New Circuits Page 140
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Car radio application using class AB Audio Power Amplifier usually has TDA7360 inside it. It is a22W bridge or stereo audio ampwith features such as minimum external components, high output power, fixed gain, clipping detector and etc. Above circuit diagram....
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The Motherboard, or Mobo v4. 3. 4 BETA, is an addon board to plug onto the Softrock v6. 3 RxTx, to transform it into an all band (160-10m) HF transceiver electronically controlled via USB. Mobo v4. 3. 4 BETA is developed by a team of radio amateurs. The....
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This electronic project is a simple microphone preamplifier based on the LM318 op amp. The LM318 op amp is operated as a standard non-inverting amplifier. Resistor R1 provides an input path to ground for the bias current of the non-inverting input. The....
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Alright, my 2204 won`t bias properly. I can`t get the tubes to idle at more than about 14 W (435 V * 33 mA cathode current). I popped a set of old Telefunkens in, but the wouldn`t go much over 10 W (440 V * 23 mA). They bias just fine in the middle of pot....
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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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is a crystal radio circuit that is simple in design but ineffective in tuning to the medium wave AM broadcast band. Component: Antenna, ....
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With a bit of adeptness, you can build an electronic scales based on a servo motor. Depending on the type of servo you use, it can measure weights of up to around five kilograms (11 lbs) with reasonable accuracy. If you examine the operating principle of a....
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The following circuit shows about Single Supply Phase Locked Loop Circuit Diagram. This circuit based on the LM331 IC. Features: the response of ....
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Gently work a small screw driver around the mic element rubber boot, and slowly work it out from the mic front casing. Be gentle and take your time. I found that there was a spot near the top of the mic housing where I could work the screwdriver in to get....
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Its resistance decreases when the temperature in its vicinity increases above one degree or more. Component: LED, Buzzer, Transistor, Capacitor, ....
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Two NAND gates are used for the oscillator, and two as the control. If the two-tone speed needs to be altered, the 220 F capacitors can be changed (larger for slower operation). If the frequency of the oscillator is to be changed, the 0. 2 and 0. 1 F....
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This circuit provides a delayed visual indication when a door bell switch is pressed. In addition, a DPDT switch can be moved from within the house which will light a lamp in the door bell switch. The lamp can illuminate the words "Please Wait" for anyone....
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The first step to building a RFID door lock with a basic Arduino is to bread board out a basic working arduino. Most Arduino pre-flashed ATMega 168 chips come with the default blink program pre installed. Connect a LED to digital output 13 and verify that....
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By simple, I mean that these circuits only flash one or two LEDs. This is opposed to the light chaser circuits that can flash four or more. Of course, the simplest LED flasher is simply to use a flashing LED. The problem with that approach is you have no....
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In essence, this circuit is a 15 to 20-second courtesy light extender for cars. It is activated in the usual way by opening a door but it also samples the negative lock/unlock signals from a car alarm or central locking and does two more things. First, when....
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6 function 8 channel light chaser using 8051. AT89S51 which belongs to the 8051 family is used for generating 6 lighting sequences. Simple software and hardware....
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For this project the 1 1/4 meter Midland 13-509 ischosen, mainly because it`s use in several (transparent) links, which support the SRG 147. 20 repeater. First strip out several items not needed or otherwise to improve reliability and performance. That would....
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A simple alarm circuit with diagram and schematic that generates multi tone sound. This alarm circuit is suitable to use in burglar alarms and sirens and is designed using dual op amps MC1458 and LM 380...
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This circuit is intended to signal, through a flashing LED, the exceeding of a fixed threshold in room noise, chosen from three fixed levels, namely 50, 70 & 85 dB. Two Op-amps provide the necessary circuit gain for sounds picked-up by a miniature electret....
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Hi I am looking to add a simple wet/dry knob to a gssl (actually chameleon labs 7720) for parallel compression. Came across this schematic - it seems....
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The ULN2003A and Zener from the driver board inside the same device. It`s a 5 wires motor, but the one in the schematic is 6 wires. I suppose the only difference is that the 5 wire version has the two center taps joined together so that`s what you see in my....
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The circuit was built on Vero board and tested using a large value electrolytic capacitor instead of a battery. The 500 ohm preset resistor sets the actual output voltage. The 47k preset controls the hysteresis and sets the voltage at which the charger....
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This type is commonly used by home users for the Presidency with their PC. UPS to be able to do this type of filtration against power failures and flow management, in addition to design efficient, small size and inexpensive. UPS is the type most often used....
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There`s no substitute for sheer power- low efficiency speakers, outdoor sound systems, or maybe you like the full flavour of the dynamic range of a high power amp. Whatever your requirement-this super power module should fit the bill. How it works: The....
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The charging circuit stops automatically when the battery is fully charged. So you can leave the emergency light connected to AC mains overnight without any fear. The circuit can be divided into inverter and charger sections. The inverter section is built....
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This VCO uses an LF356 op amp to produce a linear frequency vs. voltage characteristic using the CMOS HC4046. The frequency range can be changed by changing the capacitor connected between pins 6 and 7 of the HC4046. Using the HC4046`s internal transistor....
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This is a simple SCR based burglar alarm circuit. Its features include automatic Exit and Entry delays - together with a timed Bell cut-off and Reset. It`s designed to be used with the usual types of normally-closed input devices such as - magnetic-reed....
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The halogen or krypton bulbs in modern torches (USA and Canada: flashlights) have a limited life and are not particularly cheap. A simple modification in the torch lengthens the life appreciably. It is a fact of nature that any incandescent bulb has anite....
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This relay circuit is controlled by almost any type of infrared remote controller. This circuit works on assumption that almost all remote controller use high frequency modulated infrared light. By filtering out un-modulated or low frequency modulated....
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Time would be much better spent on explaining transistor and MOSFET behaviour in a simpler way and getting on with digital circuitry and microcontroller projects. You simply cannot put a transistor into a circuit and expect it to produce the calculated....
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This page is about an old LM032L LCD module from Hitachi. I found an old one and tried to make it work. The module can display 2 lines with 20 characters each. This page will describe how I got the module to work on a PIC 16F84A microcontroller. First I had....
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This is a 2 x 70W audio power amplifier circuit which built using single IC STA550. The amplifier circuit require few external components (most of them are resistors and capacitors) and is very easy to design The STA550 audio amplifier is capable to provide....
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A battery is a low-impedence source of power. It is most efficient and economical when supplying low voltage at high current..
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Here is a simple IR audio link that can be used to transmit audio signals up to 4 meters. The signal to be transmitted is applied to the base of Q1 via resistor R4. The transistor Q1 drives the IR transmitting diodes D1 and D2. The audio input will be....
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Openbench Logic Sniffer is an open source logic analyzer. It`s designed to support the SUMP logic analyzer software at the lowest possible cost. Download the source and design files from the Gadget Factory project page. This project started in the comments....
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This time it is using the IC made by National Semiconductor the LM2662M. This is a direct replacement for the MAX1044 just it is a surface mount part (so it is a lot smaller). I have also changed the main voltage regulator to the LM7805ACT, more on this....
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The LT3483/LT3483A are micropower inverting DC/DC converters with integrated Schottky and one resistor feedback. The small package size, high level of integration and use of tiny surface mount components yield a solution size as small as 40mm2. The devices....
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The serial interface is working fine (Read the ID register correctly) but for some reason the on-chip current sources doesn`t seem to work. I have connected 470E resistor on IOUT1 and have configured the IO register (Value 0x03) so that 1mA is sourced on....
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Figure shows a simplified representation of the Earth`s dipole field, it resembles the field due to a bar magnet. The field lines originate at the south magnetic pole and terminate at the north magnetic pole. The angle that this field makes when it....
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12V car battery is recomended to be used as the input, transistor 2N3055 is used as the amplifier. It will deliver the power output up to 100W and you can use this inverter for battery charger, emergency light and other electronic appliances...
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I tried the circuit below, but i couldn`t make the output.. Plz help me with corrections. In schematic: Resistors - 10k capacitor - I tried both 1uf and 10 uf Diode ....
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Circuit transistor tester is a fairly simple circuit tester. Transistor tester circuit shown below can be used to measure and know the pins and determine the condition of the transistor. In addition this circuit transistor tester can also find out what kind....
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This article provides an overview of fluorescent dimming and an application circuit for low-end small fixture applications ICs where dimming levels below 10% are required and more comprehensive protection features are needed. The electronic ballast circuit....
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Here is one basic circuit of a simple but accurate 1Hz timebase generator built around a standard Quartz clock circuit board. Just lift the clock PCB from any cheap quartz clock and carefully remove all extra components like the drive coil, buzzer, alarm....
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The PRUBY module that provides a PLL interface for rubidium frequency references such as the LPRO-101 and FRS-C products manufactured by EFRATOM Ball, Inc. The module conditions the ten megahertz (MHz) signal from the reference and provides both a square....
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Power-supply sequencing tutorial uses the MAX16046 system-management IC. Configuration software simplifies the configuration of the tolerances and the sequence order....
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Repair a Samsung SCR-3000 DVR COMBO for my security system. I`ve replaced 3 capacitors which were obviously blown, and see only one resistor (adjacent to the transformer) that is scorched. Problem is I can`t read the bands and hope someone can tell me the....
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This light dimmer is used to dim the intensity of 12V light bulbs using the well-known 555 timer that is configured as an astable multivibrator. The pulses....
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This is a metronome circuit that has mechanical sound character. The metronome that has mechanical sound character will make our life more fun and it would be....
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Is the battery empty, or is there something wrong with the device? That s always a difficult question when your walkman or some other battery-powered devi....
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This circuit is a simple dual simplex to half-duplex driver for 1-wire devices, although it does not work with all of them, because some draw too much current. It was designed and tested for DS18B20+ 1-wire digital thermometer. The parasite power only....
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This 220V mains operated solid state flashing lamp circuit uses a 555 timer IC to control the ON and OFF times of a triac which controls power to the load ..
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As you can see in this schematic circuit this battery charger has extreme few components, but is doing a very good job. When power is applied to the circuit the SCR1 is off, so there is no bias-current path to ground. The LM317 is connected to the battery....
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We aim to transmit more information by carrying articles. Please send us an E-mail to wanghuali@hqew. net within 15 days if we are involved in the problems of article content, copyright or other problems. We will delete it soon. ..
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The following schematic diagram is four hour timer circuit. Feature : easy to build, 3 hours 53 minutes total time, 9V supply voltage. Component : 555 timer IC, Resistor, capacitor, switch, transformer, LED, CD4040B, Relay, BC547 transistor, 1N418 diode,....
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This circuit is similar to the "Fading Red Eyes" circuit (in the LED section) used to fade a pair of red LEDs. In this version, the lamps are faded by varying the duty cycle so that higher power incandescent lamps can be used without much power loss. The....
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Because it is the 12 bits, the highest rank counter is divided to 1/4096. Because it is, in the highest rank, the signal of 4KHz can be seen in the about 500-millisecond blink. A 7 segment display is manufactured encapsulating 7 LEDs inside a single case.....
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Here s a design circuit that is used to active circuitry and an analog meter to make sensitive DC current measurements. A reader subsequently asked if it could measure AC microamperes and that is what spawned the idea. This is the figure of the circu ....
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By the addition of one integrated circuit and some passive components, I was able to convert my earlier developed 40-meter direct conversion receiver design into a superhet model. Anyone who has listened to 40 meters during the evening hours on the crowded....
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VLQC is a quenching circuit designed in our laboratories to perfectly suit the constraints of an array, i. e. high compactness, cross-talk avoidance and low afterpulsing. In VLQC a single transistor performs the sensing, quenching and reset tasks drastically....
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The LCD module has built-in fonts and can be used to display text by sending appropriate commands to the display controller, which is called HD44780. Detailed information for using the display is available in its datasheet. A schematic diagram of the LCD....
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The MFOS NOISE TOASTER circuit consists of seven main components: a voltage controlled oscillator, a white noise generator, a voltage controlled low pass filter, a low frequency oscillator, a simple AR envelope generator, a simple VCA, and a one watt....
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This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage proportional to the measured temperature. The output frequency bursts are conveyed into the mains supply....
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FM tracer was prepared using the LM3909 IC and some supporting components. 1. 5V FM trackers This will provide an indicator of revenue sources by providing a signal emitted by the LED. FM tracking uses a source voltage of the battery cell and fruit....
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This is the circuit of LED color fade effect. Just like the name of the circuit, the light intensity of LEDs in this circuit will fade from high intensity to low intensity and then off. 30 uF condensator and the resistor marked with blue 100k control the....
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High frequencies are here defined as those above 50, 000 cycles per second. For industrial power supply the Golpitts circuit, Fig. 28-1, or the coupled-grid self-excited oscillator circuit, Fig. 28-2, is most commonly used. In either circuit, the alternating....
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The chassis layout has been designed, and the 17" x 14" x 3" steel chassis is ready for drilling and hole-cutting. There`s no backing off now, Dogzilla will live! It`s actually starting to look like a piece of gear. Most of the chassis parts mounted, except....
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Hi there, I have a preamp circuit that is part of a powered subwoofer that is making a static/popping noise. It sounds similar to the scratchy, dirty....
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Because the Neon has inboard mounted turn signals, they are not visible from the side. Typically a manufacturer will mount a second light that is visible on the side or make the side markers blink, as they did on the 9x Neons. However on the North American....
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This UHF antenna amplifier circuit or UHF antenna booster circuit can be used to amplify or boost the signal of UHF band from 400 MHz to 850 MHz. This circuit is using only single transistor and provides 15 db amplification. For best results keep all the....
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Many modern motherboards are equipped with an infrared data interface compliant with the IrDA standard, but this interface not very often used. However, it is not difficult to build a data transmission module and connect it to the corresponding header. As....
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This analyst is, a sensitive instrument, in the frequency changes and width of a acoustic signal. Thus the brightness of LED that turns on each moment of is proportional signal width, while the colour of proportionally frequency....
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What you will be seeing here is a circuit diagram about the electrical wiring diagram of the 1986 Ford Bronco and F-Series Pickup. Please make sure you have read and understand about the electrical wiring diagram shown here first before making any wiring....
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The TV transmitter circuit given here uses UK standard 1 FM modulation for sound and PAL for video modulation. The audio signal to be modulated is pre-amplified using the transistor Q1 and associated components. The transistor Q2 has two jobs: production of....
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The digital lock shown below uses 4 common logic ICs to allow controlling a relay by entering a 4 digit number on a keypad. The first 4 outputs from the CD4017 decade counter (pins 3,2,4,7) are gated together with 4 digits from a keypad so that as the keys....
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The work of the circuit this origin frequency sound circuit model astable multi vibrator. When build the circuit suits power supply the circuit will still....
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This motion detector alarm can detect a moving person from a distance of 1 meter. It uses a dual IR Transmitter-Receiver module HOA1405. When the sensor de....
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