Popular Circuits Page 162
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A constant-current power LED driver circuit is shown in Fig. 1. Q1 is turned on by R1 and acts as a variable resistor. Q2 is an “over-current” switch and R2 sets the maximum current. For the power LEDs that I use, the 1W circuit draws about 440mA from the DC....
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Ai comparator input than + mine Rl, when the output Japan level, A: The Congress lost dry -VREP (absolute value), its output is also a day level, the Ai, As output connected to..
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This is USB sound card with PCM2902 chip. For the purpose of testing the D / A converters, I built a simple USB sound card with the circuit PCM2902. The card has analog input and output, an electrical S / PDIF output, galvanically separated input and optical....
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The liquid detector is a detector with liquid alternating voltage and can be built using some common electronic components. Voltage alternative for this circuit is made using a gate with Schmit trigger function, which works as an alternative power....
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LA4555 Audio Amplifier Stereo circuit and mono circuit are given in schematic .LA 4555 is basically a stereo amplifier with 2.3 watts into 4 ohms speakers at a total dis....
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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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This circuit is a Single chip metal detector.Actually we can use this one to detect metals.Specially,I think you have seen some army soldiers keep some thing to detect metals.That equipment has been made through this circuit.so you also can use this to....
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This article explains how to design a stepper motor system using an 8-bit Freescale microcontroller - MC68HC11E9..
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This is the circuit diagram of a voice operated relay. It similar with sound activation switch circuit which will turn on and turn off (connect and disconnect) the switch depending on the sound input. The output switch of this circuit is act by a relay...
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The circuit diagram and code on how to connect an 16x2 LCD to a PICAXE-18M2 microcontroller using the lower half of a port for the data lines....
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Here is another fun project for children as well as electronics beginners. We often hear the sound of grasshopper or cockroach (i. e. shrill sound) at night. The project published in this website Electronics grasshopper produced PI-PI sound (sound like....
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As shown, the circuit by the sound detection circuit and the monostable trigger circuit, the actuator for the relay. VT1 complete input audio signal amplification, when the sig..
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You can add as many extra zones as you like to the SCR Burglar Alarm System. The first circuit is designed to be used with the usual types of normally-closed input devices such as - magnetic-reed contacts - micro switches - foil tape - and PIRs. The second....
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Circuit shown in Figure 3-170. Wound rotor induction electric motive at different speeds induced in the rotor voltage (turn difference frequency EMF) U. A s U, o (Us0 is sl when the rotor open circuit voltage). The three-phase voltage through a bridge....
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IC LM2917 IC chip is designed specifically as a Frequency to Voltage Converter or Frequency to Voltage converter. In its use to applications Frequency to Voltage Converter IC LM2917 requires few external components. There are several examples of applications....
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This simple 220V power interface is intended as an interface for monitoring electric equipments and devices using a computer. The interface only senses whether the device being monitored is turned on or off. The most important aspect of the circuit is the....
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The circuit is split into two sections: the isolated external loop which is connected to the remote interface connector on the front of the PSU and the non-isolated inner loop which is connected to the HT (AC line) supply. The two loops are linked by....
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Companies usually purchase one type of telephone for all employees, which is understandable, especially if they obtain a discount for buying in quantity. One ringer sound for everyone can pose a problem, though, if the sound of a ringing phone makes a dozen....
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Before and after the adoption stage and servo circuits are power supply. ..
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This project can be used with a standard Hitachi HD44780 (or compatible) controller chip to control it through only 2 wires. There is a variety of shapes and sizes available. Line lengths of 8, 16, 20, 24, 32 and 40 characters are all standard, in one, two....
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A 10 bit scanning voltmeter with a Minimum Mass Wireless Coupler, based on the ATMega8.Range to the Minimum Mass Base Unit is 10 to 15 cm. If the voltmeter is battery operated, it can be floated from ground. This project is very simple physically, intended....
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So here is another improvised model circuit that will eliminate the unwanted DC offset voltage from the output that affect the previous one discussed. By the way, all previous circuits that I discussed were intended as low power class d amp source that is....
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A very small but good quality amplifier circuit that is also fairly cheap. It is based on TDA2002 which offers very low distrortion. Power should be 12-15 volt 1,2A. The amplifier frequency responce ranges from 40Hz to 15Khz. A good heatsink is required. At....
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The battery powered light turns on easily, stays on for just a few seconds, and then turns off again. The circuit is triggered when you place a finger across the gap between two strips of metal, about l/16th inch apart. Enough current will flow through your....
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Simple circuit diagram is a schematic remote control, remote control where it consists of two parts of the transmitter and receiver. The first part is a transmitter, circuit diagrams for transmitter IC is controlled by the NE555. This system works by....
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The Mini AV Test Box circuit is as simple and straight forward as I could design. It has three main sections that I split up in the schematic. The main devices used in the circuit are the 7805 +5v Regulator, 16F84A Microcontroller and 555 Timer. This is a....
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This circuit is built around one of the most popular timer integrated circuits, the 555 timer. It will flash the led on and of at regular intervals. From left to right, the two resistors and the capacitor set the time it takes to turn the led on or off, by....
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Brand N-Ch VFET P/N: 2SJ28 from Sony for TA-N88 Class D Amplifier, great variety of active, discrete, passive components, RF, Obsolete Components available at factory price....
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This page steps through each section of my implementation of BAMTRAT. Many of the component values shown were determined experimentally, to suit my own tastes and preferences. As when building an acoustic instrument, there is a lot of room for....
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The 555 Astable generates a clock for this circuit, an oscillator giving a square wave output at pin 3 which is counted by 4017 to give a running lights effect. The decade counter-divider CD4017 has 10 outputs, for every low to high transition at the clock....
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For this project, we are going to charge a capacitor with voltage and then have the capacitor act as a temporary power source for the circuit. After we charge the capacitor with the battery, we`re going to disconnect the battery from the circuit. The....
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Capacitor Discharge firing boxes are well suited to certain types of electric match ignition and ill suited for others. Experimenting with this technology can be fun and educational, but the cost of a commercial CD firing box can be prohibitive. CD circuits....
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A simple means of generating a low-power voltage supply of opposite polarity from the main supply. Self oscillating driver produces pulses at a repetition frequency of 100 kHz. When the VMOS device is off, capacitor C is charged to the positive supply. When....
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This is the 40Mhz RF amplifier circuit. The sensitivity of a receiver may be significantly increased if this circuit is inserted between the receiver and the antenna. The amplifier circuit does not use resonant circuits and is suitable for both medium and....
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PWM waveforms are commonly used to control the speed of DC motors. The mark/space ratio of the digital wave-form can be defined either by using an adjustable analogue voltage level (in the case of a NE555 based PWM generator) or digitally using binary....
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Functions are provided to set the temperature read interval and the FTP interval for upload, The program alters a sample file called base.html and replaces variables in it with information from the PC. When run the program can be minimised at which point it....
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This is a circuit for laser door alarm is based on the interruption of Laser beam. A low cost Laser pointer is used as the source of light beam. When somebody breaks the laser path, the alarm will be generated for few seconds. This is the figure of the....
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The MC34164 VS used in the Chloroplast SE is different in one respect from the 1381 VS (used in the VTSE and 1381 SEs) in that the MC34164 has an "open drain" output which requires a pull up resistor to the positive supply for the output to go positive. The....
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This counter can measure frequencies from 2 Hz to 1 MHz, time interval, and period, and count random events. A 74C926 and 74C925 are used as the counter, and these will drive a multiplexed LED display. A 2-MHz time base is used, and a divider chain is used....
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This power supply delivers plus and minus 9 V to replace two 9-V batteries. The rectifier circuit is actually two separate full-wave rectifiers fed from the secondary of the transformer. One full-wave rectifier is composed of diodes D1 and D2, which....
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This relay circuit is controlled by almost any type of infrared remote controller. This circuit works on assumption that almost all remote controller use high frequency modulated infrared light. By filtering out un-modulated or low frequency modulated....
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This project describes a digital clock with alarm function. It uses a PIC16F877 microcontroller to generate an accurate 1 sec delay with Timer0 using Roman`s zero error method. The time is displayed in large size font on a 4G—20 character LCD that uses....
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CC4017 count/distributor consisting of a circuit diagram of the delay: ..
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The infra-red receiver requires the infra-red light to be modulated at 38 kHz, this is quivalent to a period of 26 µs. The specifications on the receiver suggested using a 50% duty cycle. We found however that this did not work the way we intended. To....
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Configure National Semiconductors DS8877 drive circuit as shown, when the 6 digit calculator and digital current conjunction, the current range is 5 to 50mA. Drive does not req..
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A 555 four-base integrated circuit delay circuits They are a jump from high to low transition of the delay circuit. That button is pressed SB snow, the output is high, after so..
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It is tapped at the first turn from ground lead side. Coil L2 is similar to L1, but has only three turns. Pin configuration of transistor 2SC2570 is shown in the fm antenna booster schematic. Adjust input/output trimmers (VC1/VC2) f..
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This simple low voltage tester circuit can be used to monitor battery and other voltage sources of current for problems, by LED display and alarm sound. Which....
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The 555 is a monostable that wants a negativegoing trigger. If the pulse you"re feeding it with is positive-going, you can run it through an inverter made up of either an inverting gate or, if you"re tight on space, a single transistor. Both ways are....
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This battery-powered metal detector uses four exclusive-OR gates contained in the 4030 CMOS integrated circuit. The gates are wired as a twin-oscillators and a search coil serves as the inductance element in one of the oscillators. When the coil is brought....
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The first SUPERTEF version was using a 68HC11 microprocessor in extended mode i.e. with an external memory program which necessitated many integrated circuits (IC) such as the 74C138, 74C373, 68HC24 and 27C64 making the printed circuit board densely....
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Power Diagram Videos DIY Solar Panel System Wiring Diagram. This is an exact diagram how Power Window Wiring Diagram 1 Amazon Printed Books Power Door Locks & Wiring Diagram Amazon Printed Books....
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The following circuit shows about Wireless Car Alarm Circuit Schematic Diagram. Features: pick up every sound in the 20m radius, 1/16 wave length antenna, transmit radio signal up to 2 kilometers, Q1 is the pre-amplifier for the microphone, FM transmitter....
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If you're not familiar with the Arduino, it is "an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software". It has a small microcontroller, a USB port to connect to your computer for programming, a power socket for....
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This is a series of lectures written for those with mild electronics background (aka Sophomore in Electrical and Computer Engineering) to learn about the wild world of Embedded Electronics. I assume only that you know what electricity is and that you`ve....
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This current to voltage converter rely on the very high input impedance of the operational amplifier. The input current (I) is forced through feedback resistor (Rf), and generates an output voltage equal to (-I x Rf)...
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For the primary multiplier, the "folder", connect the input to the triangle wave output of a VCO. Connect a LFO, envelope generator or even a DC voltage to the folds input. The result will be a harmonically rich signal at the "F out" output. A second input....
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Adapting one of my failed Tesla coils into a crystal radio set to show the neighborhood kids. I`ve run into the #1 problem everyone faces not enough antenna to generate a strong signal. I read somewhere that a proper AM antenna should be between 100 500 ft....
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As you know the AT90S1200 microcontroller include an internal RC oscillator that is disabled by default. If you want to change it (enable or disable) you must to program it with parallel mode. The most programmers working with serial mode and its not....
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This little project aims to create a USB CD-ROM device. Unlike the typical deviced which tries to imitate this isn`t a real CD-ROM drive, it just emulates it. The idea is to allow the user to store a ISO image or other kind of CD-ROM image in a SD card to....
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The circuit is able to charge 2. 4V, 4. 8V, and 9. 6V NiCd batteries. The LM317T IC showed in this NiCd battery charger schematic is use to regulate the voltage to battery charge the NiCd batteries as you know that the LM317T IC is a very popular IC from....
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Hi Folks, I`m new to the forum and a bit of an electronic newbee, (from an engineering technical perspective, though have tinkered with circuits/schema....
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This circuit is a modified version of an original interface on QSL Net. It is a fully isolated interface allowing computer control of the Trio/Kenwood R5000 receiver. Separate software is needed to control the receiver. The R5000 receiver is an all-mode full....
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Infrared interruption counter is a reliable circuit that takes over the task of counting number of interruptions very accurately. When somebody enters into the room, then the Counter is Incremented by one. The total number of Persons inside the Room is....
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The LED driver in Figure 1 illuminates retinal neurons in a biological experiment that has similar requirements. For a given LED at a given current, the intensity is stable, so switching a stable current is a simple and effective way to obtain the needed....
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The adjustable circuit breaker responds in 0.02 sunder all conditions-provided you select a fast relay for Kl. For moderate overload conditions, it"s preferable to use the fuse or the fast-acting breaker. Toroid transformer Tl senses ac load current and....
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An unconventional, scalable high efficiency 12V solar power system and battery charge controller withlow voltage cutout to protect thebattery. (ideal for systems of 50W or less) This circuit was designed for small to medium lead acid systems and feature a....
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The circuit is presented as a starting point - there will be some experimentation needed for each individual case. For the popular microwave bands the LOs are usually generated from overtone crystal oscillators followed by multipliers, with the following....
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One of the more frequently requested projects on HeadWize has been a switchbox for selecting multiple audio inputs. I built this passive preamp/switchbox several years ago to switch between two stereo sources (a portable FM tuner and portable CD player) AND....
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Audio frequency-shift keying (AFSK) is a modulation technique by which digital data is represented by changes in the frequency (pitch) of an audio tone, yielding an encoded signal suitable for transmission via radio or telephone. Normally, the transmitted....
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Visit eBid United Kingdom, the Online Marketplace without the Fees - buy and sell today....
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The RF modules used in this schematic are very simple, with only a few extra pins required for power, ground and data. The main parts used in this schematic are the RF transmitter module, RF receiver module, 18F452 and 18F4520. You can see them below, as....
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The following schematic diagram shown a conventional which is modified to become a VCO (voltage-controlled oscillator) circuit. By replacing the conventional fixed capacitor with a variable capacitance diode (varactor), we can turn a 74S124 multivibrator....
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The design changes were primarily chosen to improve weight of the system. The majority of weight savings were due to having a single board design, switching to single battery operation and mounting the battery directly on the PCB. Other small weight....
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Our eyes are very sensitive to light but they cannot see the IR (Infrared) radiations so it is some time difficult to test or check the equipments which emits infrared to confirm that either they are working or not. So here is the IR detector circuit which....
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A Morse key is nothing more than an electrical switch, capable of defining two states- on and off! But within that simplicity lies a lot of scope for artistry, and some Morse keys are truly works of art. I never intended to become a collector, but one thing....
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As a keen cyclist I am always looking for ways to be seen at night. I wanted something that was a novelty and would catch the motorists eye. So looking around at my fellow cyclists rear lights, I came up with the idea of `NITE-RIDER`. NINE extra bright LED`s....
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Originally Posted by grizli TUBE is not fork and does not resonate that way its probably longitudinal sound wave along tube metal .. and holding....
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The DC to AC inverter circuit shown in the schematic here is very simple circuit since it produce square wave, but it`s enough to power many devices. Here is the schematic diagram of the inverter circuit: The MOSFET is configured as bridge, so the current....
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This power supply will work accurately where you have the need of stable 18V DC and provides current upto 1. 5A. The circuit is using a LM7818 positive voltage regulator IC. This IC has many built in features like internal current limiting, short circuit....
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uPC1237 by a single power supply, operating voltage range of 25v ~ 60v, usually the direct use of the amplifier as a positive power source + Vcc power...
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Apply power to the frequency counter and set the coarse (top pot) and fine (bottom pot) adjustments to show zero frequency on the display. Turn the pots counter-clockwise to set to zero. Sometimes the counter will show all squares and no digits. Disconnect....
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Infrared burglar alarm circuit schematic is shown in Figure 1. Infrared transmitter is a multivibrator with oscillation frequency being 40kHz, and it is composed of IC2 ( NE555 ), R1, R2 and C3. VLS is the infrared emission probe which can be used to radiate....
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50-300mW FM Transmitter With TX300 Electronic Circuit Schematic Wiring Diagram...
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A 1996 Ford Windstar and the connector at the bottom of the console between the bucket seats reads 6 volts (VOM) and not the 12 volts expected from a cigarette/accessory connector. The 6 Volts is solid and 2 cigarette lighter connectors are available the....
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A typical device that requires less than 5v and draws less than 25mA is an LED. A LED must be supplied with an exact voltage for it to operate correctly. Because it requires LESS than 5v, a dropper resistor (current limiting resistor) must be included in....