Top Circuits Page 157
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The Dish Network 322 Satellite Receiver accommodates television viewing of two different programs in two different locations. This is a schematic block diagram of an exemplary circuit logic diagram. The receiver can predict the elevation angle of each....
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The TDA4661 is an integrated baseband delay line circuit with one line delay. It is suitable for decoders with colour-difference signal outputs (R-Y) and (B-Y)..
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A schematic diagram for a broadband QRP SWR metering circuit for use in a QRP antenna tuner. One could simply hold a momentary DPDT switch down and watch the LED while tuning the capacitors of the antenna tuner for minimum or zero light...
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183. 6MHz SAW filter in a CDMA application. The SAW filter S-parameter is used to simulate the interface with the mixer. A worked example is provided with a SAWTEK 855893 SAW filter. An optimum impedance matching circuit between the MAX2338 mixer....
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The MAX2338 receiver RF front-end IC is designed for dual-band CDMA cellular phones and can also be used in dual-band TDMA, GSM, or EDGE cellular phones. Thanks to the MAX2338 ²s on-chip low-power LO divider, the cellular VCO module can be eliminated. The....
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This article means to utilize your old PC to be come a simple controller. Many old PC like 8088 type, 8086, 80286, 80386, or even 80486 already become an obsolete systems. This board using 8-bits of LPT printer parallel data port (DP) to activate the relays.....
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Color sensor is an interesting project for hobbyists. The circuit can sense eight colors, i. e. blue, green and red (primary colors); magenta, yellow and cyan (secondary colors); and black and white. The circuit is based on the fundamentals of optics and....
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Stepper motor control circuit Stepper motor control circuit diagram using TLE5206 for remote control car....
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Electrical schematics diagram shown below is a simple two transistor tone controller audio circuit free pictures for download. This electric circuit is based on the well-known Baxandal tone control plan. Deviation in the value of these electrical circuit....
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When the water is empty the wires in the tank are open circuited and the 180K resistors pulls the switch low hence opening the switch and LEDs are OFF. As the water starts filling up, first the wire in the tank connected to S1 and the + supply are shorted by....
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This electronic circuit is a video signal amplifier that offers a broad band amplifier with a bandwidth of 5 MHz which will take the video signals from your VCR and will amplify them sufficiently to drive up to 3 monitors, TV sets (provided that they can....
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A substation capable of consuming 100MVA with375KVA, 60Hz in input and 132KV and 50hz using same power. so my problem is how to change the 60hz to 50hz, including wiring diagram..
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LED current drive is regulated and programmable, eliminating the need for current limiting resistors. The IC contains an adjustable voltage reference and an accurate ten-step voltage divider...
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PWM circuits are fun. You can use them to dim LEDs, control the speed of fans and motors, control the power going to a thermoelectric cooler, or control the power going to pretty much anything you want. Just make sure that you don`t exceed the maximum....
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This video shows you the basics of op amps and has an example circuit where you build an amplifier to take a tiny microphone signal and amplify it to be audible on earbuds. The circuit is based on the LM324 quad op amp IC...
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The brief with this project was to produce cost effective electronics that could be assembled by a small, informal PCB manufacturing plant based in India, repaired easily, and producible with the minimum of setup. We used "jellybean" (common/generic/low....
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The Tone generator was a simple project built as a test unit for a customer design job. We use two analog switches controlled by the microprocessor code - one switch controls the signal going to the op-amp that drives the output, the other switch actually....
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The design changes were primarily chosen to improve weight of the system. The majority of weight savings were due to having a single board design, switching to single battery operation and mounting the battery directly on the PCB. Other small weight....
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The Servo Timer II was primarily designed for parachute deployment on water rockets, but can be used for other applications. The timer controls a single RC servo motor that can open a latch on a parachute door. Once triggered the timer waits a set amount of....
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Part II of the AAM Commander RC System Article, scanned from the May 1972 edition of American Aircraft Modeler....
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When I wax nostalgic about old tube radio sets, it is not because I don`t appreciate the performance and quality of modern electronics....
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This project was completed during a course on robotics taught by Prof. Dave Barret at Olin College. The final project for the course, the goal of the project was to navigate a maze using a Surveyor robotic platform. As part of this project, additional....
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What is a servo? A servo is a small motor that you can position at any angle very accurately. It contains internal circuits that will automatically maintain....
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This USB connected unit implements a microcontroller based DDS Signal Generator providing Sin and Triangular waveforms with adjustable magnitude and offset up to 50 kHz. TTL and 1 V square waves are simultaneously provided. Additionally ± 12V and a variable....
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This page describes building a IR remote shuttle release for the Nikon D70s digital camera (compatible with the Nikon D70 and possibly others). The equivalent commercial product is the Nikon ML-L3 remote control. It can be used to trigger the shutter for....
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This page describes a project a colleague and I completed between September, 2000 and March, 2001 as part of the Engineering Physics degree program at the University of British Columbia. In summary this project involved building a USB device using the PIC....
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After reading Robert`s article, I immediately wanted to build this project so I ordered an HMC 1001 sensor and started breadboarding the circuit. As it turns out, there were a couple errors in the schematic that appeared in Sport Rocketry. I took Robert`s....
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This is an old Dynacord Eminent Amplifier, featuring 5 x ECC83, 2 x EL34, GZ34 rectifier and EM84 "Magic Eye". It has two instrument and two microphone inputs with separate bass/treble controls and a master volume. I got it for 50 Euro in VERY used condition....
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After the unexpectedly big success of my JFET bass preamp I decided to build an onboard version. For a Jazz Bass-like instrument, I had to get along with three controls, maybe some switches if I used push-pull pots. Further, I wanted the functions of the....
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This class of amplifier is designed to follow low level stages, one example is a crystal oscillator. An oscillator for optimum performance can NOT be loaded down, it needs an intermediate stage following. This will then present a sufficiently high enough....
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The graphs below show the computer predictions of filter performance forwarded to me by Harry PA0LQ. Click on the thumbnail sketch to show the full-size graph. One major problem in aligning the filter was that I did not (and still do not) have access to a....
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I`ve had an interest in building a simple VXO transmitter for many years, but was unsure that the limited tuning range usually associated with VXOs would be useful on the busy HF bands. However, the ability to switch a number of crystals, and cover a number....
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Over 90% energy saving than incandescent or halogen bulbs Lifespan is over 50,000 hours. No flickering. Good for human eyes. No RF interference or UV radiation. Special design for excellent thermal management Input Voltage: AC85-265V Output Voltage:....
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1. Driver: L298N Dual H Bridge DC Motor Driver IC 2. Driven part of the terminal supply area Vs: +5 V ~ +35 V; such as the need to take power within the board, the supply area Vs: +7 V ~ +35 V 3. Driven part of the peak current Io: 2A 4. The logical part of....
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I worked on developing a digital frostpoint hygrometer for measuring water vapor at NOAA. Using an old analog instrument as a reference, I created this new hygrometer using AVR microcontrollers and other digital electronics. I laid out the circuit board....
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A simple and efficient PWM lamp dimmer using timer IC NE555 is discussed in this article. Yesterdays linear regulator based dimmerscan only attain a maximum efficiency of 50% and are far inferior when compared to the PWM based dimmers which can hit well....
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Making a timer that is used for circuit training or boxing training etc. Here is the cycle I am looking for. This does not need any input, but to reset the timer to the beginning. its a simple project why not making it simpler by using a microcontroller you....
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A universal digital gear display that can be installed on any motorbike. A low cost solution based on simple TTL digital technology without software programming....
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Power and serial communications are provided by the FTDI USB RS232 converter chip. You don`t have to do anything! Connect the USB cable from your computer to the board and a new serial com port will install under Windows. Also includes socket for I2C EEPROM....
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This battery-powered monitor has been designed to provide an audible indication of keying for those whose rigs lack a CW sidetone. Its sensor wire is wrapped around the transceiver`s coax no direct connection is required. Of course Morse isn`t the only use....
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This is implemented as a windows service that detects any power event (Suspend, Hibernate, Reboot, Shutdown) and can send a proper response to the control circuit (Heartbeat or Kill). The trigger is also controlled via Ignition Power so that the amp will....
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A simple little three-transistor FM wireless microphone / room bug that can really throw-out quite a signal. With a wide tuning range from 80 MHz to 120 MHz, this little device can transmit anywhere within the FM broadcast band (88 to 108 MHz) and can be....
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Brian and I did spot and eliminate a little problem. I believe it was probably caused by me using an old version of CadSoft`s Eagle, and then (later) a newer version. Therefore I have checked the Eagle project files in the current version (6. 4), and re-made....
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The The reciprocating detector was designed by R. S. Badessa at M. I. T. The RD features a carrier-synthesized reference signal and requires no external bfo. The circuit offers advantages over conventional detectors in that it adjusts its bfo level....
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The heart of the circuit consists of the Arduino microprocessor which is indicated by the header pins on the left of the circuit schematic shown on the right (click to open in new window). Two of the analog inputs (0 and 1) are connected to the emitter sides....
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This page is for info on converting the low resolution optical encoders, typically found in serial mice, into high resolution encoders needed for DSC`s (Digital Setting Circles), for your telescope, etc. The serial mouse encoders I found had the dpi stamped....
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How to build a MIDI interface to connect a SB/SB Pro/SB16 sound card joystick port to a MIDI capable musical instrument....