New Circuits Page 101
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Given below, is a very simple circuit that can be used for charging car batteries. In this circuit there is facility for monitoring the charging current and voltage. The circuit is based on the IC MC78T12ABT from Freescale. The IC is nothing but a 7812 in....
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To be successful with this project, you will need to construct this circuit in some manner, either as shown here or as I showed in the previous section. While the construction is not complicated, errors will keep the V-USB software from working (said another....
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Using the LT3692 dual current mode PWM step-down DC DC converter circuit with two internal 3. 5A switches can be designed a very simple power supply circuit, that can be used for various electronic circuits applications like : distributed supply regulations....
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The Global Positioning System (GPS) relies on more than two dozen GPS satellites orbiting the Earth. Each satellite transmits signals including a very precise clock plus satellite position information that allows a GPS receiver to determine its location,....
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The Photovore`s brain is built around two NAND-gates and six inverters, four elements each in two 74HC00 IC`s. Two photodiodes (the `eyes`) and two feelers provide input for a Schmitt-trigger, determining which of the two stepping motors (clocks m1 and m2)....
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This is a simple design circuit for transmitter video. This circuit can radiate as far as 50m. This video transmitter can be used with the camera as a source. You can view them on VHF channel analog TV. Supply voltage to the transmitter can use 9V battery.....
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hi am trying to make a pic based inverter circuit. the circuit uses 2 p-channel mosfets(f9540n) with a centre tapped 12-012/230v transformer. i....
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According to current legislation in many countries, vintage cars must also be fitted with a fog lamp at the rear. In modern cars, there is a bit of circuitry associated with the fog lamp switch to prevent the fog lamp from going on when the lights are....
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This is the electrical signals that run along the neurons in your brain and body in general, constantly relaying information back and forth throughout the whole complex machine. Without it we would be like plants, with one part of our bodies completely....
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A complete guide to tackling those difficult electrical system tests in today`s cars. The ultimate resource for getting rid of that check engine light! Get info from a professional technician today!....
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The voltage range will be 0V to 24V and I don`t expect to use any more than 4A. A micro and LCD could probably be added to measure voltage and current. Here is the schematic: Basically the circuit looks more or less OK. Regarding the voltage setting....
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This simple LED torch is driven by a 2-transistor blocking oscillator which steps up the voltage from a 1. 5V cell. It relies on the inherent current limiting of the 150 µH choke to protect the white LED from over-drive. With a 9V zener diode in place of the....
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3V Battery powered, Beeps after a fixed minutes delay This circuit was developed since a number of visitors of this website requested a timer capable of e....
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Unless you can get a custom made transformer your circuit design is ruled by the transformer available to you, if the primary winding is not center taped you are limited to an AB driver. The only transformer you can play with is a center tap primary, if the....
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While smoke alarms are quite cheap devices, the cost of 9V batteries quickly exceeds their purchase price. Added to that is the irritation of random beeps from the alarm as the battery reaches the end of its useful life. This circuit allows typical smoke....
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KA2213 is a single chip record and play back integrated circuit which is produced by South Korea`s Samung, it is used in recorder and unit audio. 1, KA2213 internal circuit block diagram and pin function KA2213 internal block contains a record and play back....
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IC 555, Light Alarm (Sun Up Alarm) , This circuit designed to sound a loud alarm at the break of the dawn especially for those wh cannot wake up even with an alarm clock. Circuit can be modifi....
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The following multi-function water level controller circuit post is based on the suggestions expressed by Mr. Usman. Lets learn more about the requested modifications and the circuit details. 1) To protect the motor from potential overheating (or as a safety....
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This circuit uses a 0. 1O 1W resistor connected in series with the output of a power amplifier. When the amplifier is delivering 100W into an 8O load, the resistor will be dissipating 1. 25W. The resulting temperature rise is sensed by a thermistor which is....
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This electronic lighting dimmer circuit is used to control the lamp for arbitrary brightness. This electronic lamp dimmer circuit work for incandescent lamp, not a fluorescent one. The dimmer circuit here work for both 110V and 220V AC. The dimmer circuit is....
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Here we have an astable oscillator built around 555, which gives an alarm tone of 1. 8 KHz directly driving a speaker. This is basic alarm circuit, which is later used in many other projects in the book. While the circuit shows only 1. 8 KHz operation, it....
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This device contains a ringing generator and a tone oscillator. The tone oscillator is set to either 350 or 440 Hz. The ringing generator is a potted module delivering 86 Vac at 20 Hz. It is available from a source listed in the reference. (View) At the....
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Laser communication system circuit diagram. The circuit module consists of a transmitter and also a receiver which use IC LM386. It is powered by a 9V battery..
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How to connect a buzzer to an Arduino when the buzzer operates at a different voltage to the Arduino. The circuit uses a NPN transistor for connecting the buzzer....
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Here is the circuit diagram of a passive DX bass circuit that can be used with almost all audio amplifiers. This circuit is designed by Mr. Emmanuel Chipula ( emmanuel@windowshoppingmalawi. com ) from Malawi and was sent to us for publication. We tested this....
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This is an audio power amplifier, with its final stage giving 40 W/8 ? at Class A. The power transistors, are always ON, allowing a very high current to flow....
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The Cmos 4060 IC has two built-in inverters - at pins 9, 10 and 11. They must be wired together to form an oscillator - the output of which is at Pin 9. While the oscillator is running - Pin 9 is switching continuously from high to low and vice-versa. It`s....
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The lighting hood of AquaOne AR-320 tank. These small tanks generally come with crappy tubes with low power output and an algae-friendly colour spectrum. There are numerous ways to improve the lighting such as replacing the hood with a metal halide pendant,....
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A 27MHz NBFM transmitter circuit schematic with MC2833 and 2 FET transistors MPF6660. Using a Motorola MC2833 one-chip FM transmitter, a few support components and am MPF6660 RF amp, this transmitter delivers up to 3W into a 50 ? antenna. It is capable of....
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This simple aerial booster circuit design might be an alternate or a hobby project for making such an aerial booster device for the Citizen Band (CB) radio..
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Four high level inputs, Double Bar switching This module can be a necessary addition to the Modular Preamplifier Control Center when more than two sources....
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The most they do is seemingly run the code, but with a few I/Os unfunctional. e.g. half the LEDs it drives work, aseemingly random half. I have tried the Microchip suggested slow power-up circuit without success. Seems like it shouldn`t need it, because the....
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This circuit uses a microcontroller I/O pin to control a high power load such as a motor, without risking damage to the sensitive circuits of the micr....
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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 circuit is essentially a light chaser but it can also be set to provides heads or tails (Two Up) or a Dice (die). It also has a speaker to simulate the sound of a spinning roulette wheel. Note that the dice and heads/tails features can be deleted if....
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This circuit uses a digital voltmeter (formed from IC1 and IC3) to display fuel quantity as a percentage of a full tank. In order to work with two kinds of fuel sensors, low resistance = full. Where higher resistance full, IC2 forms a dc amplifier that has....
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The features available via the keypad are mentioned in the Spectrum128 Introduction Manual that was included with every machine sold. The service manual for the Spectrum128 is aimed at repair technicians and describes the circuitry and communications....
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It is widely thought that light can be therapeutic for the human skin and soul. Light at the correct wavelength may also be effective against depression and allergies. There is a wide range of products on the market, at prices from a few tens of pounds to a....
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This is a simple flashing led circuit with 2 leds and 2 NPN transistors. It illustrates the behavior of transistors and capacitors and if you use an oscill....
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This article reviews basic servo systems and development of the fault-tolerant feedback systems for servo systems. Controller receiver circuit design, proper PC-board receiver circuit layout, and the encoder`s signal cable and termination are discussed.....
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The circuit can be divided into inverter and charger sections. The inverter section is built around timer NE555, while the charger section is built around 3-terminal adjustable regulator LM317. In the inverter section, NE555 is wired as an astable....
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Function Generator is an essential laboratory equipment. The module described here is based on high quality XR2206 IC. 1Hz - 2MHz XR2206 Function Generator is capable of producing high quality sine, square and triangle waveforms of high-stability and....
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ML2011GD/ML2011HB is MP3 decoder LSI easily used. Besides the MP3 decoder, it integrates stereo DAC and 8 © 650mW drive speaker amplifier that allows MP3 playback function only by building this LSI into the application...
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For the purpose of this project, digital signals can be communicated with computers while analog signals can`t. RS232 is the name given to your serial port. At the back of your computer, there`s many ports where you can plug things into. The RS232 port has 9....
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This project uses a microcontroller programmed with software that is posted on the Gerns-back BBS at 516-293-2283 as part of RUNABOUT. ZIP. The robot can be controlled via a universal remote control. ..
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You will need 512 properly working LEDs in the lattice. They will need to be stable and bright. This step will show you how to separate the faulty ones from the usable ones. Lots of times there are broken LEDs, especially when they come in large packages.....
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HI ALL, PLZ LOOK THIS CIRCUIT. I BUILT THIS LAST DAY. BUT THIS IS NOT WORKING. I CHECKED ALL CONNECTIONS AND PARTS. BUT ALL IS OK. WHEN I TURN ON THE....
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The Laser1 RoboBrick is a module that is designed to allow the use of a slightly modified laser pointer to detect passive refector beacons at a distance of approximately 10 meters (or about 32 feet for the metrically impaired. ) It is meant to be used in....
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TI`s Dafydd Roche completes his 4-part series on sound-bar design with a detailed explanation of clock design for the digital portion of the circuit..
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This design was born of frustration with the mic preamp in my Sony R91. It clips at ridiculously low levels, basically it has 28mV of headroom to deal with an input that could be as high as 1800mV (depending on mic & volume), so this design attempts to cure....
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A friend takes an interest to want to try build hi-fi power Amplifier the some one. He likes model class AB, because the sound is good. keen bass good distinct. I chooses this circuit gives him sees, be power Amplifier hi-fi OCL 120W rms sizes really, if use....
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The South Africa company, which has developed the 5 kilowatt Fuel Free Generator, has discovered that the batteries` longevity is significantly effected by the process. As far as the choice of batteries to test is concerned, there are many different lead....
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This circuit is an oscillator, and is able to generate a sound wave, a tone. The tone`s frequency (if it`s a high or low sound) is controlled by the variable resistor. The sound volume of this circuit is considerable so, don`t put your ear too close to the....
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If you want to make a flasher unit for you motorbike then this circuit is just for you. This simple turn signal flasher circuit can be easily built and installed in any two wheelers for the desired actions. The circuit employs just two 2-pins instead of 3 as....
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The EPIC Plus Programmer, Serial Programmer, USB Programmer or U2 USB Programmer may be used for in-circuit serial programming of serially programmable PIC Microcontrollers through the 10-pin expansion header J3. Vpp, RB6, RB7 and ground should be connected....
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even if I didn`t read thoroughly nice one almost enough xformers , but certainly not enough shunt regs....
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To provide rapid motor speed changes and motor direction reversal, four outputs drive a MOSFET H-bridge. N-channel devices are the lower rail power MOSFETs and P-channels are the upper MOSFETs. All of them are driven by the TC4469. A small series resistor....
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Another method of using opamps to regulate a power supply is shown. 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 below....
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The Spartan-6 board has on board 5v Relay interfacing, indicated as in Figure. ULN2803 is used as a driver for FPGA I/O lines, drivers output connected to relay modules. PTB connector provided for external power supply if needed...
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circuit multiprogs 1 BOS tx con 0 `pin serial to BOS processor 0 BOSrx con 1 `pin serial from BOS processor 4 epower con 2 `pin high turns on power to electronics 2 BOShalt con 3 `pin high halts current BOS move 3 BOSbusy var in4 `pin BOS processor busy =>....
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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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Bus Pirate is a great tool for exploring new chips using your PC, without the need to integrate the chip into a MCU project. Once I received my unit, i decided to put it to the test by exploring an accelerometer with I2C/SPI interface the MMA7456L from....
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This is an Analogue TV Transmitter. Sound modulation is type FM with a 5.5MHz carrier and video transmission is PAL. Frequency is adjustable via C5 and tunes 54 to 216Mhz with components shown. This is suitable for countries using TV systems B and G....
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Build the LC oscillator show on the bottom of this page for some school project and I`m having a bit of problems translating the theoretical circuit into a real-world one. I think I get how the circuit works on paper. We have a LC resonant circuit which will....
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This is a discrete high current switch mode LED driver circuit. The basics of this circuit is a buck-converter principle. The efficiency of this circuit is 80....
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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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The p-Wave Locked Loop provides instantaneously the p to p time interval of the applied ECG and enables us to perform heart rate variability studies on the basis of p_p variation. The first version of the PWLL started its processing action with the....
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The TA2003PG TA2003FG are AM / FM Radio IC (FM F / E+AM / FM IF) which are designed for AM / FM Radios Combining with the TA7368P (Mono PW IC), a suitable AM / FM Radio system is able to be constituted. By Toshiba Semiconductor ..
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The output of this circuit will be activated when a mix of two tone/frequency is detected on the input. The frequency f is determined by the values of R1 and....
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That HID headlights + small slim line plates REDUCE the distance a police car can ambush you (lock in with laser/LIDAR) to get....
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A simple astable timer made with the 555, the mark (on) and space (off) values may be setindependently. The timing chain consists of resistors Ra, Rb and capacitor Ct. The capacitor, Ct charges via Ra which is in series with the 1N4148 diode. The discharge....
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Look at the left side of the circuit (sensing coil and op-amp). When I wired mine the way shown in the schematic, it wouldn`t pick up anything. I didn`t have a 1mH radial inductor handy, so I fashioned my own using 30ga enamel wire and a round core (100....
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The HANDI-Finder ® is a HANdheld DIrection Finder which can be used to localize both AM and FM carrier-based sources using a single connection to the antenna input of an FM receiver tuned to the frequency of interest in the range of 45 to 450 MHz. It has....
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This is the schematic for an FM transmitter with 3 to 3.5 W output power that can be used between 90 and 110 MHz. Although the stability isn`t so bad, a PLL can be used on this circuit....
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Got a free treadmill. Here`s the diagram that came with it. Sorry about the size. I have a question about a board that is up in the console. It has four readouts, time, speed, distance and calories. Don`t need those. It also has a membrane panel with four....
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This is a write-up for a 2011 update to the 2008 lanc circuit project, lets call call phase 2. This update allows the use of a cx700v camera to be used in the same underwater video housing. Such a housing is called a generic housing. A generic housing....
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With many audio systems consisting of separate units, you ll often ?nd that due to economic reasons only the amplifier has a remote control receiver modul....
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I removed the entire setup from a bike awhile back and it ran then, and also ran about a year ago in the engine stand that it`s currently mounted in now. This afternoon I went to start the thing up to test things out before selling it off and hit a glitch.....
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Where VD is the voltage drop across the diode, and VTrans is the voltage drop across the transistor. Note that the continuous/discontinuous boundary occurs when io is zero. The main question when designing a converter is what sort of inductor should be used.....
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LM4782 uses the system of protection of National Self Peak Instantaneous Temperature ( Ke) (SPiKeTM). Spike protects the exit of the lm4782 of on tension on load, short of the source for gnd, temperature protection and picks instantaneous of temperature.....
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Almost all of the audio power amplifier if using integrated circuit amplifier as circuit shown here which is use M12CLK is an power operational amplifier. It allows an output stage operating at even 2 ohms impedance and gain power 150W. For stability and....
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One thing we should keep in mind is that the EC10 is now a vintage receiver, it has collector appeal. Any-thing we do should really be carried out in a manner that preserves the original state, most of the following adheres to this. Things like replacing all....