Popular Circuits Page 196
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The common home solar power system, in principle consists of a roof-mounted solar panel, a charge controller and a storage battery bank plus direct or elec....
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This LED (Light Emitiing Diode) display consist of 10 LEDs to indicate the level of an input signal. If the signal is small, only LED#1 will light, and if the signal level getting higher then you`ll se the light dot will move through LED #2, #3, #4, and so....
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Normally analogue-to-digital con-verter (ADC) needs interfacing through a microprocessor to convert analogue data into digital format. This requires hardware and necessary software, resulting in increased complexity and hence the total cost.
The circuit of....
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A meter is a measuring instrument. An ammeter measures current, a voltmeter measures the potential difference (voltage) between two points, and an ohmmeter measures resistance. A multimeter combines these functions, and possibly some additional ones as well,....
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This design uses four IC`s and has four input circuits and four independent outputs and a single master reset switch. The outputs here are LED`s but may be modified to drive lamps or buzzers. Only one output LED can be lit at any time. The first person to....
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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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Variable power supply for laboratories. With two ICs can take different output voltage and amperage..
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This circuit is a dual low/floating/high logic state detector which enables you to see the logic state of a digital signal pin. Each detector has two LEDs (typically a red and a green one) which indicate the state: red LED for high state, green LED for low....
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Circuits available for indicating water level is usually consist of LEDs to indicate the liquid level. But this circuit uses a 7-segment LED display instead of normal LED`s for numeric display of water level. Moreover, a buzzer is used to alert you of water....
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After the wizardry that is our standard renegerative front-end receiver circuit, we will be able to see some initial output receiver from our transmitter. The point in the schematic we`ll look at first is right after the LC tuning circuit and DC blocking....
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As shown below, is described in a minibus odometer circuits, the odometer and speedometer is electronic, mechanical integration combination of new instruments. Pulse signal out..
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This article describes a circuit of simple single cell li ion battery charger or lithium ion battery charger. Using the LP2391 regulator IC....
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This inductance meter is actually an adapter to your digital voltmeter (DVM). Using this circuit now your voltmeter is capable of measuring inductor value. Inductance meter is very helpful in designing switch mode power supply, since its often needed to wind....
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This is a design for fire alarm circuit. This circuit is based on a LDR and lamp pair for sensing the fire. The alarm will works by sensing the smoke produced during fire. The circuit produces an audible alarm when the fire breaks out with smoke. This is the....
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The system adopts the modular design, the one-chip computer AT89S52 and CPLD is CPU of the overall system, the coordination of the control system. Set up the cycle of the systematic pulse signal through 4G—4 key set module at first, choose the output mode of....
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The ABS is help to make thestooping distance less and help tosteer while breaking it increase the traction of the wheel anddoesn`t lock while hard breaking. The basic design of a braking system has been around and in use in other applications for many years.....
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Most of the telephone security devices available in market are simple but quite expensive. These devices provide blinking or beeping type line-tap/misuse indications. Quite often they do not offer guaranteed protection against unauthorized operation. A very....
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The logic designer is filled with features. It would not be possible to list all the possible combinations of the unit as the various building blocks on the board can be interconnected to obtain a wide variety of counting and testing stages. You will be able....
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Phototransistor also called phototransistor, it is more commonly used as a photosensitive device, which is characterized by photosensitive resistors and photodiode same impedance can be adjusted according to the size of their own light intensity...
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The ADSP-BF533/32/31 processors are enhanced members of the Blackfin processor family that offer significantly higher performance and lower power than previous Blackfin processors while retaining their ease-of-use and code compatibility benefits, processors....
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1C is a CD4 cries O. A (16) feet for the Vcc terminal. (8) feet for the ground. (12) feet for the reset terminal. (7) feet for Qt end, (3) feet to q. End (Sh, U). (Il) FW exter..
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This is a slightly less professional-looking version of Handmade Electronic Music, with almost identical content (and free!). See in particular Chapters 18 and 20. Layout of conductive metal strips under the breadboard performations. There are generally two....
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This project was inspired by a circuit that a friend of mine, Simon Field, over at Scitoys. com showed me. He had built a very simple transmitter circuit out of a 1Mhz "can" oscillator and a serial connector (see it here ) In his circuit he used a computer....
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Balanced mixer circuit is shown by the two dual-gate field effect transistor. RF signal by the input signal transformer Tl effect transistors coupled to the gate of the two, th..
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Broadband high frequency amplifying circuit Shown as a broadband high frequency amplifying circuit, and is mainly composed of a high-frequency matching transformer amplifying t..
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This circuit gives an early warning of the discharge of batteries. Zener diode Dl is chosen for the voltage below which an indication is required (9 V). Should the supply drop to below 7 V, Dl will cease conducting causing Ql to shut off...
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This circuit is 5 channel Equalizer simply cheap (one line chanel). Working principle of this series is a series of frequentiefilter with center frequency of 10...
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This is a complete alarm system with 5 independent zones suitable for a small office or home environment. It uses just 3 CM IC`s and features a timed entry / exit zone, 4 immediate zones and a panic button. There are indicators for each zone a system armed ....
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This Design Idea involves a low-power motion-detector circuit that operates from battery power for extended times. Part of the design includes a solenoid-operated trip mechanism that triggers whenever it detects motion. The drive circuit for the solenoid in....
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A Simple design based on a CS209A IC that can give surprising results and draws very little current from a 9 volt battery. It worked good on the Bench, But not so good outside for general metal detecting. But Definately a good design for detecting studs in a....
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For wiring to the microphones I used a wiring harness from an old portable headphone set. Find one with a 90 degree miniplug if possible. Cut off the headphones, solder the condensor mics to the leads and voila. Anything larger than the pencil soldering....
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The power transformer has three secondaries: 720V at 120mA center-tapped for the plate and screen supplies, 6. 3V at 3. 5A for the tube filament and bias power supply, and 5V at 3A (not used). Since the 5V secondary is not used, a little more current than....
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The Spartan-3 Primer board has external stepper motor interfacing, indicated as in Figure. Stepper Motor is driven by ULN2803A. It is a high-voltage, high-current Darlington transistor array. ULN2803 is used as a driver for port I/O lines, drivers output....
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Constitute a CMOS circuit time adjustment of a spot welder The number of cycles it uses CMOS device composed of a control circuit, optionally in the range of 1 to 99 cycles to ..
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In this series I use IC tda2822M as the main amplifier, but if you want to use in addition to IC TDA2822M you can use ic I mentioned this is KA2209, NJM2073, U2822B, U2823B. Output is issued no more than 4W, which had low output. Supply voltage from 3 volts....
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This is a design circuit for modular arrangement that allows the amateur to choose only the modules more suited to his requirements in order to build a chain one to five modules long. For the minimalist, the Control Center module described in this pa ....
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If you face the challenge of adding a second, independently controlled light source to an existing ceiling lamp controlled by a wall switch, you may find that stringing a second power line is impossible. First, you can replace the wall switch by the circuit....
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This hybrid circuit uses a mixture of transistors, an IC and a relay and is used to automatically open or close a pair of curtains. Using switch S3 also allows manual control, allowing for curtains to be left only partially open or closed. The circuit....
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An expanded scale voltmeter (ESV) can save your plane. That may be a strong statement, but it`s true. The crucial radio link that lets you control your plane relies on nickel-cadmium (NiCd) batteries in the transmitter and receiver. If either of these....
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This Cheap circuit will amaze you with its wide range recieving signal between 6 and 17Mhz (49-19meters). Power supply is not necesery, just connect it to your pc, place the antena to your home piping network and voila!..
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Basically, the idea is to use a high-precision A/D (analog to digital) converter to collect data, and then store that data to an SD flash memory card in a Windows-readable format. I have the SD card software written (that was by far the hardest part of the....
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There are not many AM transmitters that are easier to build than this one because the inductor is not tapped and has a single winding. There is no need to wind the inductor as it is a readily available RF choke (eg, Jaycar Cat LF-1536). To make the circuit....
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Circuit operation principle of the device shown in Figure. When the barbed wire Fe intact, LSE's O, feet collusion between its pin output high,..
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Your HVsupply will work, but for your own safety and to avoid accidental damage to your circuit if the event you need to troubleshoot with a scope, I strongly encourage the use of an isolation transformer on the 120VAC input. Just a little 1:1 transformer,....
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Fly back transformers are commonly found in television sets and can put out 50, 000 volts, enough power to lift a 350 pound man up and throw him back 10-20 feet killing him instantly. Also the component`s are picky sometimes and reversing the polarity....
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Input 1 is used as a gating period, during which a single rising edge on input 2 will cause a logic 1 output-any other number, indicating non-identical frequencies causes a logic 0 output. ICla converts input 1 to a narrow pulse which initializes IC2 which....
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Explanation Here is a simple circuit diagram frequency (F and V) voltage conversion. It found that the digital frequency meter circuit, the circuit is mainly based on a LM555 t..
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The ROMs or PROMs must have the correct code for converting the data from the NE5037-used as address for the ROMs or PROMs-to the appropriate segment driver codes. The displayed amount could easily be converted to degrees Fahrenheit, °F, by the controller of....
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An edge combiner comprising MOSFETs C and D has to generate a 16ps pulse. Centre frequency as a function of NMOS width Wser over inverter width Winv. Figure 12. Illustration of transmitted, reflected, dissipated and leaked signals of a switch in the (a) ON....
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This is a design circuit for mass air flow sensor circuit. The mass air flow sensors converts the amount of air drawn into the engine into a voltage signal. The primary components of the MAF sensor are thermistor, a platinum hot wire, and an electronic....
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The circuit was designed to create a power amplifier circuit that will utilize E80CC and EL34 vacuum tubes for better results while providing 35 Watts of....
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The RF engineer sometimes has to look for an instrument that will check a low frequency quartz crystal unit reliably and rapidly. This is a difficult piece of equipment to find and the engineer often has to consult an electronic circuits handbook for the....
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Logic probe is useful tool to measure, in a check digital circuits. As a meter, which is used to measure power in electrical circuits. Logic probe was used for....
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Here`s the circuit diagram based on PIR motion sensor module BS1600 (or BS1700) that can be used for security lighting in power saving mode. (If you could not found one in your local store, buy PIR motion sensor online). The special advantage of this motion....
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Operational amplifier based triangular wave form generator is simple circuit that is widely used in function generators. Here is the circuit for Triangular wave generator using 741 op amp. We know that the integrator output waveform will be triangular if the....
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CMOS circuits are known for their low current consumption. This is particularly important for battery-powered circuits. Unfortunately, oscillators often r....
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A simple calling bell circuit that can be used in small offices to call the office boy using an existing intercom system. The office boy can be called from up to nine locations where extension lines are installed. The system is connected to a dedicated....
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The most important part of a school`s CATV-CCTV system, is the process of planning for its infrastructure and the actual plan itself. The schools planning ideally is best facilitated when it involves all the school`s role groups as well as the district and....
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It uses reed KR V control thyristor conduction, with 555 integrated circuit path consisting multivibrator as an alarm generator. When the door is closed, the permanent magnet close to the reed switch KR, with normally closed contacts reed contacts open,..
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The herein circuit shows basic configuration for bipolar stepper motor driving which can be applied using either an L293 or an L298N. This circuit shows that a single device can be used to drive a two phase bipolar stepper motor..
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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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I aimed to copy the sound rather than the vintage circuit. Easy to build, low current consumption, no signal level changes on bypass, quiet and, most importantly, it does that Bridge of Sighs thing...
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I have been put forth with this question many times in this blog, how do we add a change over selector switch for automatic toggling of an inverter when AC mains is present and vice versa and also the system must enable automatic switching of the battery....
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Measuring distances using a modulated laser. The circuit I created (see above) is very simple and does not need many explanations. The first part consists of a fixed voltage regulator 7805 to derive a stable +5 V source. This is followed by a LM317....
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This design uses a Motorola MPX4115 Silicon Pressure Sensor, a Dallas Semiconductor DS2438 Smart Battery Monitor (to perform 1-Wire analog to digital conversion), an operational amplifier, a voltage regulator, a diode, and several resistors and capacitors.....
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The circuit shown here is of a simple 0 to 9 display that can be employed in a lot of applications. The circuit is based on asynchronous decade counter 7490(IC2), a 7 segment display (D1), and a seven segment decoder/driver IC 7446 (IC1). The seven segment....
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The CODE and CONST memory classes are typically stored in ROM that may be either off-chip or on-chip. The CODE memory class is used for the actual program code while the CONST memory class is used for constant variables declared in code space. In addition,....
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Cooling an instrument or a device can improve the SNR (signal-to-noise ratio), and it can also prolong product life. For example, the dark-and-noise signal of an infrared detector`s output at room temperature can be an order of magnitude smaller when cooled.....
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The light barrier described here can be used to guard an entrance. You can use it to signal of someone is walking through the corridor, or to check if the car has been parked far enough in the garage to be able to close the door. The circuit consists of a....
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The design of this project depends on the sensors. The control module and the robot both contain sensors. The computer, in turn, analyzes the signals to make the appropriate output actions. As previously mentioned, the potentiometers are the sensors on the....
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EL auxiliary lights. When the lights dim in the ballroom, EL automatic lights, and a ballroom lights dim in the more serious,..
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Two gates of a 4011 arc used as a comparator. When the resistance of R4 decreases the voltage at pin 1 and 2 increases, producing a logic zero at pin 3, causing pin 4 to go high and activating the LED. R3 is calibrated in light units, or seconds exposure....
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The following circuit shows about 741 IC For Constant Temperature Control Circuit Diagram. Features: used to lower the drift of a Ramsey FM10a ...
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This circuit is intended for use with motors, lamps,heatings etc. Continuously from nearly zero up to maximum capacity (5-95%). Almost lossfree control by means of this impulse control. Nearly total turning moment of motors. The transistior T3 must....
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The HV9911DB2 is an LED Driver capable of driving up to twenty 100mA LEDs in series from an input of 9 16V DC. The demoboard uses Supertex`s HV9911 IC in a boost topology. The converter has a very good initial regulation, (+/-5%), and excellent line and load....
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Reverse engineered circuit diagram of a popular retail doorknob alarm. It contains a small transmitter and the doorknob acts as an antenna so it will not work on a metal door. When a person comes close to the doorknob this loads down the oscillator and the....
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Because power for the circuit is obtained from the car"s side lights, the circuit can"t oscillate unless the lights are o..
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In addition to providing an accurate input current limit, the LT1618 can also be used to provide a regulated output current for current-source applications. White LED drivers are one such application for which the LT1618 is ideally suited. With an input....
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The circuit provides accurate full wave rectification. The output impedance is low for both input polarities, and the errors are small at all signal levels. Note that the output will not sink heavy current, except a small amount through the 10K resistors.....
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The goal of this project was to create a multi-effect guitar processor. This device will be capable of changing the tonal qualities of the guitar. Through these changes in tone it is possible to give the guitar a very wide array of unique sounds. This....
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With DC control voltage of 5 mV to 5 V, circuit controls frequency of both square and triangle outputs with good linearity. Peak value of triangle output is precisely set at 2. 44 V and 0 V by reference voltages at noninverting inputs of comparators.....
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Many times exists the need recording some conversations from a telephone line and this it's relatively easy. If we want however to have the possibility recording from two telephone lines simultaneously in a tape recorder, we needed a circuit as what appears....