Popular Circuits Page 54
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VID2G project is an PAL/NTSC color generator & video identifier with digital sync regeneration, digital PLL, video Squelch output, predefined video pages, keyboard & full RS-232 access, etc. Dynamic and fixed ID`s, user positions, user selectable....
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Diagram below shows a simplified diagram of the main peripherals present in the 89S52 or 8052 / 8051. There are 3 Timers/Counters in the 89S52. The expression "Timer/Counter" is used because this unit can act as a Counter or as a Timer as per requirement.....
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The circuit described here provides three channels of optically isolated input that will work for many precision signal-acquisition applications. The only power required is a single 15-V rail with ground common to the analog-to-digital converter. Multiplexer....
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The following circuit enables me to measure inductance of the inductor labeled LX which is the inductance to be measured. The o/p of the circuit is a TTL square wave whose frequency relates to the inductance being measured. The heart of the circuit is the....
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Here is a very simple, inexpensive and interesting project which provides lot of fun to a home experimenter or hobbyist. This simple transmitter can transmit speeches or songs within a short range. The circuit uses only one transistor. The entire circuit can....
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A Pulse generator usually allows control of the pulse repetition rate, pulse width, pulse delay and pulse amplitude. More sophisticated pulse generators may allow control over the rise time and fall time of the pulses. A pulse generator`s delay is measured....
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The crystal oscillator, which uses two sections of IC1, a 4001 quad 2-input NOR gate, is a standard and reliable design. The oscillator"s 1.85-MHz, square-wave output feeds IC2, a 4017 divide-by-10 counter. The count enable and reset terminals, pins 13 and....
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This is a High Voltage switching device for driving coils and which have big impedance when it is switched off. It can be use in Back-EMF energy recovery tests, Newman coils electronic commutator.....This device is drived by an opto-coupler and can be easily....
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The circuit input is taken from the terminal loudspeaker or amplifier output jacks. If the right channel is large enough to charge C1 to a potential which exceeds the breakdown voltage of the emitter of Ql, a voltage pulse appears in R7. Similarly, if the....
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An L7805 provides a 5v rail. The input and output of the reg is bridged by a 470 F and a 10 F capacitor respectively to try and smooth things out a bit. The 5v rail created by the L7805 then powers the MAX232 level shifter and the GPS module itself. Thee....
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This is a 28VDC to 5VDC switching converter circuit. As a switch-mode voltage regulator, this circuit gives higher efficiency than linear regulator type....
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The digital navigation PC board may be configured for a number of navigation functions, see figure 1. It may be made into a simple visual digital compass, or a microcontroller based compass. The microcontroller based compass can be used for mobile robotics....
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By the oscillator circuit, a counter, Iseki circuit of three parts. Oscillation circuit by the time base manifold NE555 and several external RC element. Its function is to prov..
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The Triac drivers use the 5 VDC output signal from the 74HC595 chip outputs (Q1, Q2, Q3, Q4, Q5, Q6, and Q7) to switch the 110VAC gate signal to the Triacs. If you are connecting the IC chips directly to the PC, a desktop PC MUST BE USED to drive the....
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Driving an LED, we covered the electronic theory of how to use a Power MOSFET to turn the LED On and Off via a digital signal. In this post, we are going to walk the reader step-by-step on how to wire-up the circuit on a breadboard. The Bread board is an....
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This Project Automatic Room Light Controller with Visitor Counter using Microcontroller is a reliable circuit that takes over the task of controlling the room lights as well us counting number of persons/ visitors in the room very accurately. When somebody....
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Timer Garage Door Circuit schematic diagram, printed circuit board..
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A relaxation oscillator is used to flash an LED in the base circuit. C1 is charged slowly through R1 by the power source, then discharged periodically through R3 and the LED by the UJT. Flashing rate is determined by the supply voltage and by R1-C1`s time....
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Circuits, C1, R1, varistors, L1, R2 filter circuit composed of a primary power supply, can filter out transient overvoltage input, C2, R2 down circuit composed, C3, C4, L2, and..
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A limiter circuit that requires matched zener diodes can instead use one zener with a full-wave diode bridge. The..
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The requirement was to add a digital readout to an otherwise manually bend roller machine so that we could accurately monitor the amount of material fed into the machine. The readout should be simple to use, require no setup other than initial calibration....
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I have been getting a lot of emails about this project. Most of them are because of the bad source code listing at the end of the author`s notes. I have seen this problem all over the web and I too have ran into the same problem when compiling the code. I am....
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The circuit, shown will produce up to 5-W RF output in the 40-m (7 MHz) amateur band. The coils shown are wound on toroidal cores (Armdon Associates Inc.). The part numbers are given in the schematic...
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As shown, B2 (13), B3 (14) for the Hall current sensor; FU9 (9), FU10 (10) for the fuse; AP646 alarm signal for the fuse board; terminal X24, X26 and X29 is a user interface panel; XT for the outlet...
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An air bridge after whole bullock Phi Beach, Sichuan hoof direct beam lights Wherever control called road six buildings frog buck filtered output ul fiV altar right voltage for..
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LA5522 Application Circuit It works briefly as follows: When the supply voltage vcc motor mechanical or negative change when the load changes,..
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Had developed the 7 MHz CW TRX for my first trip to the US. The receiver worked very well. (Actually a lot better than here in Europe since they do not have high power broadcast stations on 7. 1 MHz. ) The transmitter is also quite ok. 1. 5 Watts is not a....
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The Sun-Up Alarm can be used to provide a audible alarm for when the sun comes up or it can be used in a dark area and detect when a light comes on. It can also be used to detect a light beam, headlights etc. The circuit works as follows. The phototransistor....
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The magnetic field built up in the ballast collapses quickly, producing a high voltage across the tube and causing the internal gas to conduct. It`s a bit like slowly blowing up a balloon and sticking a pin in it...
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The Clock Controller was designed to be an exemplary of using 'C' language to control timer0interrupt, 7-segment LED and keypad scanning. It provides 1-bit sink currentdriving output, for driving a relay, opto-triac, say. Many projects requiring7-segment....
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A 7805 can be configured as a constant-current regulator, to serve as an inrush current limiter. Rl will have 5 V across it at all times so the total current through 11 will be 5 V/R1 + 5 mA, the 5 mA being the regulator operating current...
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The term amplifier as used in this article can mean either a circuit (or stage) using a single active device or a complete system such as a packaged audio hi-fi amplifier. An electronic amplifier is a device for increasing the power of a signal. It does this....
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The basic circuit can be operated at 80 kHz and is limited by the PUT capacitor combination. 60 kHz is the maximum modulation frequency. The pulse repetition rate is a linear function of Vin, the modulating voltage. Lenses or reflectors minimizes stray light....
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Shows the use of C-MOS IC count divider circuit, as in Fig. LC main TC4040, wash it is a 12, 14 -bit counter, the circuit can be made using any of the frequency dividing ratio of the circuit, for example, can be made 1 / divider circuit 3600 (signal of one....
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Multisound generator is very interesting project in the series of alarm project multisound generator generates 8 different type of sound circuit diagram of.various electronics project...
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The main reason to go to the trouble and expense of running trains on battery power is to avoid cleaning or even wiring the track. The issues of track cleaning really can be a big deal. Adding radio control to a battery power system adds the capability of....
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The circuit is light seeking; it will follow a flashlight around a darkened room. A pair of photocells determine the direction in which the robot will move. Each photocell is connected to an op amp configured as a comparator. When sufficient light falls on....
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The old 555 timer will certainly work given the specs you provided, and that`s the way to go if you are sure this is precisely the problem you want to solve. By the way, as Steven mentioned, the general name for this type of timing block is monostable....
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Design Goal: The JavaBot1 is a small line following robot designed to follow a black line drawn on a dry erase board. It is designed to follow very tight c....
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This very simple circuit acts as a high sensitivity capacitive sensor. Lamps and/or Buzzers are operated at half the mains supply voltage when a part of the human body comes in contact with the sensor or approaches it at a close distance. The circuit can be....
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White LEDs are widely used in small LCD backlight
applications for simplicity, high reliability and low cost.
However, due to variations in the forward voltage drop of
white LEDs, matching the brightness becomes a major
design consideration for multiple....
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Can set the thermostat, the thermostat lower limit of the circuit diagram: Apparatus circuit src /d/file/200903/cec7c13418f35640e242ae37ad02292f.jpg width 600 border 0 ..
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The Amplifier circuit can be made with an IC power amplifier LM1875. IC LM1875 is a single chip power amplifier from National. 20 watts audio amplifier with LM1875 is a low power amplifier with good quality to the room. To assemble the amplifier 20 watts....
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The circuit turns on a light corresponding to the first of several buttons pressed in a ""Who`s First"" game. Three stages are shown but the circuit can be extended to include any number of buttons and lamps....
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DDS VFOs work very well with single conversion SSB radios such as the Codan 6801, 6924, 7727 and 8121, and the AWA Teleradio 110H. See the Recycled Radios page for more information about suitable Codan radios. Other commercial and marine transceivers with....
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We can use the flash beam to supply the remote control for the AC power devices. The important point of this device is the memory function. It can continuously supply the power to the device. When it acts the second time, the power will be cut off....
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DC to AC inverter is used to convert DC voltage source to an AC voltage source. DC AC inverter circuit works by switching the DC voltage source to make an....
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As shown in FIG measuring temperature alarm circuit to the Treasury. The device consists of inverting amplifier IC1, comparison amplifier IC2, low-frequency multivibrator IC3, ..
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// 555 Timer With On Off Delay Circuit Here is a timer circuit using common IC 555. The circuit is designed to facilitate time adjustment of both...
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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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U1a operates as a low-noise microphone preamp. Its gain is only about 3.9 because the high output impedance of the drain of the FET inside the electret microphone causes U1a?s effective input resistor to be about 12.2K. C2 has a fairly high value in order to....
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No matter what kind it is, passive human body infrared sensor circuits are almost the same with the above, maybe some has less stages. This circuit in the figure is got from the NICERA producer, which is classical. The stage of front-end is the low frequency....
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I designed the ZX97 as a discrete copy of the ZX81, which was the first PC for millions of people. In the process ZX97 turned into much more than a mere copy. While it is backward compatible with the ZX81, it is in all other respects a significant....
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A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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This 555 timer circuit toggles a relay when a button is pressed. Pins 2 and 6, the threshold and trigger inputs, are held at 1/2 the supply voltage by the two 10K resistors. When the output is high, the capacitor charges through the 100K resistor, and....
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This set of two circuits from the basis for a very simple light wave transmitter. A LASER beam is modulated and then aimed at a receiver that demodulates the signal and then presents the information (voice, data, etc. ). The whole thing is very easy to build....
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The circuit uses an IRF740 MOSFET which is rated at a maximum DS V value of 400V. The avalanche voltage is calculated as 3520 1. max DSA VV V. This means that up to about 500V of inductive kickback voltage can develop in the switched coil. More than....
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Man has long wrestled with Time. Also, with knocking on things and not getting the time of day. We propose a knocking platform through which these fundamental needs are met. This is illustrated with the Knock Block KUI and accompanying Clock Knock Block....
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This simple circuit helps you sniff out RF radiation leaking from your transmitter, improper joints, a broken cable or equipment with poor RF shielding. Th...
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This is a circuit to record the altitude of a R/C-plane. The data is saved on a SD-Card. It uses an ATmega8 microcontroller and a SCP1000 chip to measure temperature and (more important) atmospheric pressure. If you decide to build and use this circuit, you....
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Motor Bike Headlight Controller Circuit Circuit This circuit automatically turns a motor cycle`s headlight on and off, independently of both the light and ignition switches, provided the battery is fully charged. The first stage....
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As shown by FIG MAX4102/4103 Video configuration/RF distribution amplifier. Signal input MAX4102/4103, after amplification the output. To make the transfer process reflection m..
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78 Series integrated voltage regulator rated output current of 1.5A, For larger output current, the output current can be extended using the square method. Extended output curr..
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As simple as it gets. The mixer consists of two transistor-based preamplifiers. The aboriginal one (designated Mike in ) offers college gain. it works able-bodied with a approved activating microphone. The additional one can be acclimated to ascendancy....
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As shown in the zero-power regulator circuit is simple, reliable and able to work. It is suitable for all kinds of electric power adjustment appliance, series wound motor power..
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As shown when the power supply is 0 to 1 hour, set the AC circuit diagram 555 constituted within one hour timer, J 212 IRC MR312C relay coil impedance, or current of less than ..
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The NE568A( NE568AD NE568AN SA568AD SA568AN 0 is a monolithic phase-locked loop (PLL) which operates from 1Hz to frequencies in excess of 150MHz and features an extended supply Voltage range and a lower temperature coefficient of the VCO center frequency in....
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The transmitter includes RDS/SCA input and Audio/MPX input with optional preemphasis. It can be used with or without stereo encoder. Tuning over the FM band is provided by two buttons that control dual-speed PLL. The transmitter can work also without the LCD....
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This is a one chip sound level meter that can be use for displaying sound level of an amplifier or simply the sound level from a microphone. The heart of the circuit is IC LM 3915 Audio level IC. Even though it is a stand alone IC, a peak detector based on....
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The circuit employs a 100 ohm isolation resistor which enables the amplifier to drive capacitive loads exceeding 500 pF; the resistor effectively isolates the high frequency feedback from the load and stabilizes the circuit..
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The pre-regulator circuit connected to the capacitor, resistor element. Regulator in its conducting direction through the input ..
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The converter generates an output voltage which is linearly proportional to the input frequency waveform. Each zero crossing at the comparator`s input causes a precise amount of change to be dispensed into the op amp`s summing junction. This charge in turn....
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In recent years, following CD`s introduction, vinyl recordings are almost disappeared. Nevertheless, a phone preamplifier is still useful for listening old vinyl discs from a well preserved collection. This simple but efficient circuit devised for cheap....
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Usually, the electrical system of the 2005 Yamaha DT125X consists of CDI unit, battery, thermo unit, rectifier/regulator servomotor, fuse, neutral switch, ignition coil and main switch. (click image to enlarge)..
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Here is a really simple game show timer designed with the beginner in mind! The power source is an ordinary 12 volt lantern battery or battery pack made up of C or D cells. The lamps may be ordinary flashlight bulbs; the prototype uses 750 mA Krypton types....
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The circuit is intentionally designed using old type transistor, it is to get the harmonic distortion and to avoid the difficulty of finding good components. Amplifier (s) can be easily supplied by plug-in wall transformer 12V. Closing SW1 bass boost is....
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This simple LED tester consists of a current source with a potentiometer that can be used to adjust the current. The current source is implemented using a type TL081 opamp. The output current of the opamp flows through the diode and R2. The voltage drop....
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This circuit is permanently plugged into a mains socket and NI-CD batteries are trickle-charged. When a power outage occurs, the lamp automatically illuminates. Instead of illuminating a lamp, an alarm sounder can be chosen. When power supply is restored,....
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When the phototransistor is stroken by IR light it conducts and the voltage between the 1Mohm resistor(arbitrary) and the phototrans drops from VCC to lower values. When the voltage drops lower than VCC/3 the 555 is triggered and goes high (from 0 TO VCC).....
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This is a part of a 100W RF amplifier. This circuit built based on RF power transistor BLY94. Component: BLY94 Transistor, Inductor, ....
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This circuit is onlyreader. It`s not programmer. You CANNOT refill, hack or any illegal thing, the telecards. The purposeof this circuit is for you to understand how a microcontroller readsthetelecard, forbuilding other electronic circuits such as"electronic....
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Amplifying circuit diagram to enhance the output current and voltage: ..
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This clock timer uses a PIC16F628 microcontroller to display 3 and 1/2 digit time and control an external load. It can be programmed to time from 1 to 59 minutes. The clock includes a calendar with leap year and optional daylight savings adjustments. The....
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I am now looking to make a power supply adjustable cv 0-30v and would really like it to be adjustable cc as well. I have found various circuits for Cv, but very ....
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The particular circuit is substantially a generator of accidental numbers, from 1 until the 6. The clue him we see in a line from led, that each one corresponds also in a number from the 1-6, if push and leave, the S1 (push button). This movement corresponds....
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Circuit diagram is water activated relay circuit. In this diagram circuit using two transistors connected as a high gain compound pair. 2N2222A transistors T1 and T2 may be a BC108. Current gain will be the product of each transistor beta, which will be a....