Popular Circuits Page 157
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Here a video of a test flight of my Quad Rotor Observer (QRO) v8 with the FCWii board and the Wii Motion Plus (gyroscopes) + Nunchuk (accelerometers) MEMS...
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LED lighting, and the potential that it brings, is moving to the forefront of residential and commercial lighting markets. However, to maximize the success and adoption of solid-state lighting for retrofit lamps, the LED lamps should be capable of dimming....
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A used 250VA power transformer that was removed from equipment a couple of weeks ago. The transformer has a dual 10V AC output and a few auxiliary voltage outputs. The 10V winding is rated at 10A, I thought it would be perfect for a high current power supply....
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Application note on how to design linear and switch-mode (switching dc-dc converter current source) battery charger applications that require external microcontrollers and related system-level issues for notebook computers....
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The FM modulator circuit (frequency modulation) is built with a Motorola MC1648P oscillator. Two varactors, Motorola MV-209 are used to frequency modulate the oscillator. The 5000 ? potentiometer is used to bias the varactors for the best linearity. The....
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This circuit leads palmorefmata coils,, engine. Each coil is driven by a transistor type Darlington. Darlington Transistors internally comprise two transistors connected in series. The "hfe" Darlington is equal to the multiplication of "hfe" of both its....
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This page contains GIF images of the circuit diagram for the Solution interface, the PCB artwork, the board layout, a typical side elevation of the assembly, a parts list, some hints and a little about troubleshooting. This is a self-extracting 2. 5MB file;....
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The Philadelphia, PA based Maker/hacker group Hive76 developed a tiny serial terminal using a TI Launchpad and an HD44780 LCD. The circuit diagram and code libraries are available for download. Some useful work that can be incorporated into larger projects.....
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This application note describes the addition of a quad serial controller to the EB675001 Module. A multi source quad Universal Asyncronous Reciver and Transmitter (UART), 16554 type, was selected to ease implementation and sourcing of components. The RS232....
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The base of Ql is connected to the car`s ignition circuit; the easiest point to make that connection is at the ignition switch fuse in the car`s fuse panel. Also, one side of the piezoelectric buzzer is connected to the instrument-panel light fuse; when the....
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As shown below for the non-contact lantern control circuit. The controller includes integrated music CIC2851, drive BG1 and BG2, thyristor SCR and other components. When the sw..
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Amplifier circuit shown in Figure r) 100 shown, with two TDA2030 integrated circuit as a power amplifier; the other with a TT.082 constitute active servo circuit o TDA2030 inte..
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The oscillator is designed to tune from 1. 8 GHz to 2 GHz for typical cellular telephony applications. An extended tuning range can be obtained by adjusting the ratio between the varactor capacitance and fixed capacitance in the tank. PMOSFETs are employed....
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This is a siren sound generator circuit. Which is less expensive and can create simple. The IC1 is using CD4011 (Digital Nand Gate) and the IC2 is....
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Figure 1 represents a cheap and simple Gate Alarm, that is intended to run off a small universal AC-DC power supply. IC1a is a fast oscillator, and IC1b a slow oscillator, which are combined through IC1c to emit a high pip-pip-pip warning sound when a gate....
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This musical light alarm circuit is very simple, uses only 7 components, a LDR and a 3. 6 V battery or 3 x 1. 2 volts rechargeable batteries. The well-known UM66 is used as the sound generator and will give a pleasent wake up alarm. As you probably know the....
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A1 amplifies and regulates the signal from the spark coil. A2 converts frequency to voltage so that its output is a voltage proportional to engine rpm. A3 compares the tachometer voltage with the reference voltage and turns on the output transistor at the....
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Continuous monitoring of brain activity is essential in understanding neural substrates of many physiological and pathological brain functioning. Low amplitude of EEG signals as well as their noisy nature make it hard to detect them (1-500 uV and. 1-500Hz).....
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Europes leading SGS-THOMSON STMicroelectronics recently introduced a tone quite new to the Chinese mainland hydrazine fos power integrated amplifier TDA7294, swept past the lin..
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As shown for the basic application circuit thermistor. Figure (a) of the basic temperature measurement circuit. The circuit temperature measurement accuracy ..
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How the Bug-Eyed Eggliner came to life along with instructions that will help you to make your own. I believe that you can also use many of the concepts presented here in other projects and animations. The honey bee Eggliner already has two large eyes....
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The operation of the circuit is based on the difference in the primary impedance of a transformer when its secondary is loaded and when it is open-circuit. The impedance of the primary of Tl and resistor Rl are in series with the load. The triac's....
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With the advent of high speed HCMOS circuits, it is possible to build systems with clock rates of greater than 30 MHz. The familiar gate oscillator circuits used at low frequencies work well at higher frequencies and either LC or crystal resonators maybe....
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This V/I display module is eminently suitable for building into an existing DC power supply, where it gives a precise indication of the set voltage or the current consumption of the load. In the voltage range, the decimal point lights on LD3, and the....
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We`ve all had occasion to be annoyed at inconsiderate dog owners whose animals relieve themselves on the private property of others. This problem can hardly be solved in a lasting manner using verbal (or even physical) means, so recourse to an electronic....
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A simple multi-channel audio mixer circuit using LM3900 quad amplifier is given below. The circuit consists of 4 channel quad amplifier (LM3900). Two mic audio inputs and two direct line inputs are available in this circuit. By adding the same circuit....
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The +/- 3 dB point for the treble is about 2, 5 KHz, with about 12 dB boost/cut at 10 KHz. Perhaps you should check the wiring (again ) or perhaps componentvalues Do you have access to a signal generator yeah i checked wiring and components again and again,....
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Examples of the structure of a number of liquid crystal display drive circuit CPU tubes. ..
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Tesla's free-energy receiver was patented in 1901 as An Apparatus for the Utilization of Radiant Energy. The patent refers to "the Sun, as well as other sources of radiant energy, like cosmic rays." That the device works at night is explained in terms of the....
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The NI 655X is a versatile high-speed digital product that can interface to many different technologies. This application note shows how to interface the NI 655X to LVDS devices. Low Voltage Differential Signaling (LVDS) is an emerging differential digital....
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A common method of transforming the output current of a photodiode into a voltage signal, paralleling the photodiode with a high-value load resistor, produces a nonlinear response. Also the combination of the load"s transresistance, Rr. and the....
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Build a simple audio amplifier using transistors. I know there are IC designs specifically for the task. But i want to use transistors so i can learn how to use them for amplification. Amplifier Basics - How Amps Work (Intro) by Rod Elliott covers a good....
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The LC72146 is a PLL Frequency Synthesizer LSI circuit for electronic tuning in car stereo systems. The LC72146 supports the construction of high-performance, multi- functional electronic tuning systems for the VHF MW, and LW bands. By Sanyo Semiconductor....
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[The following circuit is adapted from battery monitors and testers published in The Smith-Kettlewell Technical File (SKTF). The first appearance of this system was "The Smith-Kettlewell Battery Tester, Where Silence is Golden", SKTF, Volume 11, No. 1,....
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A tapped transformer drives a diode bridge (D1-D4) and two 2500 µ¥ filter capacitors (Cl and C2), that provide a no-load voltage of 37 or 47 volts, depending upon the position of switch S2a. The unregulated dc is then fed to a pre-regulator stage composed....
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This circuit uses an 87C57 microcontroller and a few peripherals to condition X-10 power-line carrier-code formats from a personal computer to use an X-10 power-line interface in a home-control system. Software details are available in the reference.....
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This simple circuit has helped me out on many occasions. It is able to check transistors, in the circuit, down to 40 ohms across the collector-base or base-emitter junctions. It can also check the output power transistors on amplifier circuits. Circuit....
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When adding an alternating current signal to the capacitor, the wave position (the phase) of the charging current of the capacitor and the voltage of the capacitor shifts by 90 degrees. When adding an alternating current signal to the coil, it changes....
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The quartz QZ1 of the preceding receivers which set the work frequency is not on the market any more. It is replaced
by a locking phase loop allowing the free choice of an unspecified frequency on the band used, either the 41, or the 72 MHz. The step....
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Finally I was able to control an LCD Hitachi display and a 12-key matrix keypad with only one 16F84 or 16F628. In a near future, I will be able to control a full QUERTY-type keyboard and a LCD display. The biggest improvement on this projects was the....
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Interesting articles about reading/writing RFID proximity cards that we use foraccess to controlled areas. This all came about after a discussion with a colleague about how easy it would be to clone a card. After a bit of research we managed to find and talk....
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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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It had been only a little over a decade since the transistor was invented when this article appeared in the August 1959 edition of Popular Electronics. Transistors were still a mystery to most people, including engineers, technicians, and hobbyists. Author....
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This article describes a transformer with output FET amplifier production, its tone has been very close to the tube amp..
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The circuit a series of Dual Power Supply, where the symmetrical ± 15V supply for linear circuits. The same principle applies to supplies of non-symmetrical, such as 5. 0 V and-12V regulators for applications such as registers. To ensure start up LM340 over....
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Fridge Door Alarm circuit or a Refrigerator door open alarm using 555 Timer IC, which produces an audible alarm if the door left open for a preset time....
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A scoring game circuit is explained with circuit diagram, and circuit parts....
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The following circuit shows a Digital Compass Circuit. This circuit based on the 7805 IC. Features: simple and accurate electronic compass, solid ....
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This section contains details for providing a composite video output signal from the camera to drive an external monitor. The circuit described below, designed by Peter Smith, is a combined DC-restorer, switchable gamma corrector and video/sync mixer using a....
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A music-to-light modulator is a circuit which controls the
intensity of one or more lights in response to an audio
input. The problem in older circuits is that there was a
direct electrical connection between the lights using mains
voltages (110 to 250V....
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The heart of the switch controller is an Arduino Nano micro-controller - this is going to be the interface between the dashboard switches, wireless steering wheel buttons and the car`s lighting, indicators, windscreen wipers and DigiDash2 GPS stopwatch. This....
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This is a very simple game circuit. You can play this with your friends. To win this game one has to scores hundred points in very short time. Incase if you want to restart the game you need to press S1 button switch. When supplies the output voltage make....
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A pair of multi-range timers offering periods of up to 24 hours and beyond. Both are essentially the same. The main difference is, that when the time runs out, Version 1 energizes the relay and Version 2 de-energizes it. The first uses less power while the....
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Cheap I2c shown as a bus control stereo decoder TDA9853H. Used for a digital mediation function FM radio in stereo decoding circuit after stereo encoding baseband signal by the chip feet into the first through the stereo decoder, de- tune, a voltage-controlled..
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The CXA1786N is a Frequency Synthesizer PLL IC developed for use in mobile Communication systems. This IC has low current consumption, small package and is suitable for portable sets of cellular telephone and others. By Sony Electronics ..
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This circuit is a bistable multivibrator, or flip-flop. Click on the "set" input at lower left to bring the output high (5V). Click on the "reset" input at lower right to bring the output low (ground). The transistors are cross-coupled in such a way that the....
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Capacitor instrument is not to be used to measure the capacity of the capacitor but for identifing good or bad and short circuit or open circuit, then it provides a reliable quality assurance for the production of circuit to reduce the circuit making....
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Here is a Flasher circuit that directly derives power from AC to give brilliant flashes at the rate of one flash per second. It uses a Diac as the main ele...
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The circuit board and switches must be protected from the elements. Dampness or condensation will cause malfunction. Without its terminal blocks, the board is small. Ideally, you should try to find a siren with enough spare space inside to accommodate it.....
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To design and build a wireless transmitter that works over the FM frequency and allows the transfer of a video/audio signal over a certain distance to an FM tuner. In this fast-paced world, there is little time for inconveniences and a greater need for....
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An Hartley Oscillator circuit can be made from a pair of series connected coils. I had a couple of 22mH fixed inductors, which I hooked up on a breadboard with the other needed pieces. When I test the transistor amplifier independently, it seems to be....
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MOC3020M Integrated Circuit. I would love a LED to tell me when each cap is charged but I have no idea how to do that or where to put in the circuit, I have a bucket load of 5v LEDs so making use of some would be great. I have Circuit maker but dont have a....
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Hydrophone preamplifier circuit. As you can see, it`s really simple and uses only conventional components. The transducer used, is piezo type and has a relatively high output impedance, which requires a preamp with a high input impedance. ..
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Lead-Acid Battery Charger circuit diagram. The LM301A compares the voltage drop across R1 with an 18 mV reference set by R2. The comparator`s output controls the voltage regulator, forcing it to produce the lower float voltage when the battery-charging....
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Another method of using opamps to regulate a power supply is shown below. The power transformer requires an additional winding to supply the op-amps with a bipolar voltage (+/- 8 volts), and the negative voltage is also used to generate a reference voltage....
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Though the Arduino has no problem catching the incoming sensor data (it typically executes code in the range of microseconds (1 millionth of a second), I was running into trouble passing the data between the Arduino and Max. Without getting too technical,....
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Our focus is to create place of art, audio, and video with a vintage electronics theme. The vacuum tube is the heart and soul of any vintage radio or electronic device. Today the use of the vacuum tube has been vertualy wiped out to the edge of extinction.....
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This tutorial is in continuation with previous tutorials on 8051 Assembly Programming. Now we will learn how to give input and output instructions to 8051 microcontroller(s) using assembly programming language. The microcontroller has total forty pins in....
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Two inputs, A and B, control the bridge. With both high (or open circuit) both ends of the motor are connected to 0v. Connect A low and Tr2 turns on causing the motor to go forward. Connect B low and Tr6 turns on, reversing the motor. If A and B are both....
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There is now no need for a separate camera and recorder - for less money you can buy an integrated dash camera that will record in HD. Try the Techmoan blog for some reviews. Summary - this is a description of how to install a fairly cheap video recording....
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Using this schematic electronic project can be designed a very simple water level indicator electronic circuit that uses a 7-segment display to indicate the water level (low, half and full)in the tank. This water level indicator electronic circuit shows the....
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The schematic diagram shown in Figure 1 have the ability to synthesize a sinusoidal waveform with a frequency of 0. 01 Hz to 1 MHz. The clock signal feeds to the input of the binary counter IC1, this clock frequency is 32 times more than the output....
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This Hartley oscillator was built on the remains of a single tube Hartley using a single 45. The original circuit I constructed was one that was published in a 1932 QST article by George Grammer. As it turned out, both of the 45s I had were weak, so the....
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These filters are useful for equalisation, analysis and other tasks such as the Sound to Light converter (Project 62) or even a fully functional Vocoder. For those who have not heard of the vocoder, it is a device that takes a music source as one input and....
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Power outages after the call prohibit re-closure circuit, can avoid the use of electrical appliances after the power grid..
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All the capacitors are there to just block DC, but how important are the capacitance values and how does one determine the value of Co. Rin represents the source resistance it`s not actually part of the amplifier circuit however, it does interact with the....
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Schematic and description of a simple and easy to built NiCd and Nimh battery charger circuit which is able to charge multiple NiCd and NiMH batteries. ....
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4V flat monitor high voltage power supply circuit diagram innocentA wide range of 7 ~ 40V turn 5VDC-DC step-down circuit diagramLight control switch circuit diagram of a safety..
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A 1998 tracker it has 1. 6 multifuel port injection system. The vehical is hard to start. when we drive it their is a lack of power it wants to bog down. we have replaced plugs, cap, rotor check catlic ok. disconected the tps still runs the same. could this....
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The TDA2616 is a hi-fi stereo amplifier designed for mains fed applications, such as stereo radio and TV. The circuit is optimally designed for symmetrical power supplies, but is also well-suited to asymmetrical power supply systems.
An output power of 2 X....
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A charge pump is a simple means of generating a low-power voltage supply of opposite polarity from the main supply. The 74Cl4 IC is a self-oscillating driver for the MOSFET power switch. It produces a pulse width of 6.5 p,s at a repetition frequency of....
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This is a universal 1 Watt RF class C amplifier that is ideally suited for low power FM transmitters. Input should be at least 100mW to achieve 1W output. It is recommended to enclose the amplifier in a metal case. Build your own Accurate LC Meter....
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A very simple metal detector electronic project circuit can be designed using the CS209A integrated circuit manufactured by Cherry Semiconductor. The CS209A integrated circuit is a bipolar monolithic integrated circuit for use in metal detection proximity....
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A single-ended tube headphone amp using the TTVJ Millett 307A. I`ve been breadboarding various SE and PP power amp circuits with the 307A for a good year or more, but just haven`t had the time until now to come up with anything I like. As far as I can tell,....
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Electronics Tutorial about DC Motors, Electrical Motors and Stepper Motors used as Actuators including PWM and Transistor H-bridge Motor Control....