Popular Circuits Page 86
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This is a circuit for a game of the shooting gallery variety. IC2a and b form an astable multivibrator clocking ICl which causes LEDs 1-8 to flash in turn LED 5 is the target LED and the object of the game is to depress PBI just as LED 5 comes on. If this is....
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Place the transmitter about 10 feet from a FM radio. Set the radio to somewhere about 89 - 90 MHz. Walk back tothe FM transmitter and turn it on. Spread the winding of the coil apart by approximately 1mm from each other. No coilwinding should be touching....
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This guide will show you how to install an EDM/UKDM Honda Integra DC2 rear fog light on your 05-06 Acura RSX...
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This simple mosfet power audio amplifier circuit, with TL071C and 2 mosfet power amplifiers can deliver up to 45W on 8 ohm. This schematic is based on Siliconix application and is based on variations of voltage on the 2 resistors serial inserted on the....
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A 40 watt fluorescent tube lamp or two 20-watt tubes in series will be driven by this circuit but this circuit will produce less brightness than usual, since....
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This is a DC motor controller circuit, built using transistor TIP31 based on H-Bridge concept. The switch S1 and S2 are normally open, push to close, press button switches. The LED function is to indicate the direction of motor rotation, y....
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Presented FM transmitter bug is built using BF414 / BF324 / BF606 transistor. The 30cm antenna has a range of about 30m in the building, more in the open field. Power supply 2x AAA batteries have been used with voltage of 2.75 V. I added resistor 10K in....
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This circuit can be used to escape from the nuisance of mobile phone rings when you are at home. This circuit will give a visual indication if placed near a mobile phone even if the ringer is deactivated. When a call is coming to the mobile phone, the....
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The circuit is nothing but a simple transistor switch with a relay at its collector as load. The simplest electronic code lock circuit uses one ....
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Electronics Tutorial about the Hall Effect Sensor and Magnetic Hall Effect Switch which is an Output Transducer used to detect Magnetic Fields....
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Automatic electronic refrigerator deodorant sterilization circuit ..
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Simple IR capture for multitasking operating systems The IR Widget captures the infrared signals used by remote controls. It operates in a way that makes i....
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* 2 x 47k ohm resisters anything from 22k to 100k ohm should work. Value of these changes the timing of blinking (larger the value, slower the blinking)...
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If you are making a stereo amplifier, or if you own one already, then do not hesitate to add this circuit. The entire circuit is wired around IC4017 whose clock input is tapped through transistor BC107. Basically, IC 4017 is a 1-of-10 decade counter or a....
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CD4538 is using DIP-16 and SMD-16 packages precision monoflop. With stable performance, fewer required external components, the logic function is strong, the chip integrates tw..
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This in-depth article covers the theory behind a Delta-Sigma analog-to-digital converter (ADC). It specifically focuses on the difficult to understand key digital concepts of over-sampling, noise shaping, and decimation filtering. A description of new....
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Shows a 32.768 kl-b: micro-power clock oscillator circuit, and can be used in mobile phones, laptop computers and home appliances production generates a clock signal supplements...
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An astable multivibrator is referred to an electronic configuration which is able to generate continuous alternate high and low pulses from a couple of outputs, operating in tandem. The IC 4093 basically consists of four individual NAND gates in one package,....
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The circuit in the diagram is a very handy tool for rapidly checking all kinds of thyristor (SCR, triac, ). In case of a triac, all four quadrants are tested, which is done with S3, while in case of a standard thyristor, a positive power supply and trigger....
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The DZ-2 was built by RCA, Camden NJ, for the U. S. Navy for use in naval aircraft as a Radio Direction Finder. With a contract date of June 30 1939, the receiver is an interesting example of pre-war design. The receiver was powered by the aircraft`s 24v DC....
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Simple, portable phase-sequence indicator determines the proper phase rotation in polyphase circuits. Major components are two neon lamps, two resistors, and a capacitor. In operation, the leg voltages are unbalanced, so that the lamp with the maximum....
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I love the Arduino as a simple and accessible controller platform for many varied projects. A few months ago, a purchased an Ethernet shield for my Arduino controller to work on some projects with a mate of mine it was a massive hit for the first time, I....
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This post provides a simple method to interface any keypad (e-g 4x4 or 4x3 etc) with PIC12F675 microcontroller. The code for PIC12F675 is written in C lang....
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applications in the 2400 MHz ISM band. This two stage RFIC amplifier is off-chip matched to provide optimum performance for a variety of applications. Operating from a 5 volt supply, the PM2107 can produce 1 watt of saturated output power with 45% typical....
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The figure shows a basic two-channel op-amp mixer circuit. The gain is equal to R5/R1 or R5/R2 for channel 1 or 2, respectively. Typically R1 and R2 are 2. 2 to 22 k © and R5 is 10 to 100 k ©, and the op amp is any suitable type, such as a 741 or its....
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My final project, cycling rollers, requires a method of sensing the rotational speed of one of the rollers. Typically speed sensors on cycles work by detecting the passing of a magnet attached to a spoke on one of the wheels using a Hall Effect sensor or a....
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Although we`ll be using the Olimex P-40 development board, you can also breadboard out the circuit as it is very simple. The schematic for our first pass at controlling a servo is shown below. Servos can start to sink alot of current like any motors so it is....
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This document is an introduction to the Wideband Fuel Mixture Display (FMD). We modified the original Silicon Chip Fuel Mixture Display (that used a narrowband sensor) for use as a display for the DIY-WB wideband oxygen sensor controller. After first....
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Here is the circuit diagram of a simple two transistor alarm circuit that can be operated from a 9V PP3 battery. Here the two transistors are wired to form an oscillator whose frequency increases when switch S2 is pressed and decreases when S2 is released.....
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Measurement microphones differ from recording microphones and sound meters-they have a flat response, (usually to well below 20 Hz. , and above 20 kHz. , ) and do not have "weighted, " or equalized frequency response. They are also optimized for....
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A simple single-transistor circuit will give approximately 15 dB boost or cut at 100 Hz and 15 kHz respectively. A low noise audio type transistor is used, and the output can be fed directly into any existing amplifier volume control to which the tone....
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Pentode is astable phantastron during radar search, and d-c amplifier during lock-on when pentode furnishes direct control of klystron repeller. -NBS, "Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, " Vol. 1, Electron Tube circuits,....
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The low output impedance of a closed loop op amp gives ideal line-noise immunity, while the op amp's offset voltage drift provides a temperature sensor. Using the op amp in this way requires no external components and has the additional advantages of a....
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The IQ_Demod project illustrates the use of the IQ_Demod_Setup and IQ_Demod_Data components in ADS. These components are part of the ADS behavioral model suite found under the System - Data Models palette. "IQ_demod_ckt. dsn" is a schematic for the....
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This The multi-purpose Amplifier using TDA2030. It is have power 8 watt (RMS) at 8 ohm loudspeakers. It is have low noise be valuable THD (Total harmonic....
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Simple network design is a key feature of the Pierce circuit, as these 1-MHz oscillators illustrate.Operating the crystal slightly above resonance (Fig.21-5a) requires only one high-gain transistor stage.Operating it exactly at series resonance (Fig. 21-5b)....
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There are plenty of digital thermometers with ·1 C displays but the accuracy is about + 1 C and you can not calibrate them. I made this thermometer circuit from components that were available at the local electronics hobby shop and it was an educational....
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A strobe light passes a brief, intense pulse of electric current through a gas, which then emits a brilliant burst of light. The gas is usually one of two inert gases, xenon or krypton, that emit relatively white light when they`re struck by the fast moving....
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What is mean logic-1 or logic-0 Logic-1 and logic-0 strongly connection between the state at one moment and one condition. Logic-1 means any states are in the condition of high voltage close to Vcc voltage, and logic-0 means any states that close to netral....
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Most switch-mode power supplies rely on a PWM (pulse-width-modulated) output that is controlled via voltage feedback. A 555-timer IC can inexpensively perform PWM. The circuit in Figure 1 shows how to turn a 555 PWM circuit into an switch-mode power supply....
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As shown in FIG grounds ISO122 / 124 and PGA102, ISO150 constituted with a gain programmable channel isolation circuit. ..
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The TEM that we have, the Jeol 2000fx is equipped with two extra detectors, one secondary electron detector, i. e. SEM imaging, as well as a STEM detector at the bottom of the microscope. Because the system are from the 80`s the imaging from these detectors....
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Emergency lights, fuse/relay panel and fresh air blower switch, Engine control module and ignition coil, console switch, power windows, ABS control unit and ABS hydraulic unit, fuse relay panel and instrument cluster, and taillight, fuse/relay panel and....
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This particular timing circuit can be used to time one-shot events from a few seconds to a few hours. And in standby mode (ie, with RLY1 and LED1 off), its power consumption is very low. The heart of this circuit is a low-cost CMOS 4011 quad NAND gate, with....
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Together with a good directional antenna this high performance two-stage antenna amplifier for the VHF FM broadcast band will enable you to capture far removed (DX) stations. Alternatively, it will drastically improve reception of FM signals you`ve come to....
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A sidetone oscillator is a special audio oscillator that is turned on and off with the transmitter. The oscillator is rf-driven and bat-tery operated. It uses a 555 IC timer as an astable multivibrator. Keying is accomplished by applying a positive dc....
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This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. Please help to improve this article by introducing more precise citations. Valves (also known as vacuum tubes) are very high input....
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This circuit is used J-FET for recieve signal to buffer from LED, About Output voltage, We used IC 1458 or LM1458, while in the dark is about 7 volts and the drop about 2 volts in full sun. The LED voltage buffered by a junction FET transistor and then....
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The circuit is built using ICM7217 integrated circuit, manufactured by Intersil, which contains a CMOS counter up / down, with 4 digits and display properly. IC3 is the clock generator circuit which provides a square wave with period 1 s clock signal is....
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The circuit diagram shows a powerful stereo amplifier which can deliver a power of 22W. It is built around popular single-chip audio power amplifier TDA1554Q (IC1). Here it is configured as two 22W stereo bridge amplifiers. Listening to songs stored in....
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It`s just a AN2131 chip with the required support circuitry - crystal oscillator, power regulators etc. First I took the inputs and outputs of the key matrix and wired them to the GPIO ports of the AN2131. This was just a matter of plugging the whole lot....
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Firecrackers are normally ignited by using a matchstick or a candle. You have to run away quickly after igniting the fuse of the firecracker. This method of igniting firecracker is unsafe, because the danger of the firecracker bursting before you reach a....
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Circuit The circuit diagram of window foil burglar alarm has been published here. The main parts of this circuit are SCR H1 (TYN 612) and transistor Q1 (BC 107). This burglar alarm can be fitted in windows to check breaking attempts. Here the sensing element....
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The high-tech credit card has been nicknamed "microcontroller super card" because of all the great improvement ideas. I showed how to first verify the code, and then upload on to the arduino board. I then wrote a code for the counter to go from 0 to 9 using....
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Here is a Hobby Circuit for electronics hobbyists that can switch on & off a light, Fan, Radio etc. by the sound of clap. The sound of clap is received by a small microphone that is shown biased by resistor R1 in the circuit. The microphone changes sound....
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The following circuit shows about Bluetooth Based Smart Home Circuit Diagram. This circuit based on the ULN2003 IC. Features: LCD & LED ....
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This circuit has high output only when all three inputs are high. The noninverting-input current, when all thre..
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This is a very crude handdrawn schematic version 2. I`ll pop it into Protel later when I get the time. But it does give you a very handy overview of the circuit where it`s possible to charge from 2 different sources. Either by USB or normal charger. Also....
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Extended delta decompression starter, that is, when the motor starts its three -phase winding set to take part, eatY coupling, connected to another part of links, the entire ex..
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As shown for the direct coupling audio power amplifier. When using an integrated operational amplifier..
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A 2 diode selector circuit if your primary voltage source is greater than the diodes turn on voltage and the input voltage of the second diode. Schottky diodes are recommended for both their low lower turn on voltage (typically 0. 4v) and high switching....
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This circuit inverts the polarity of the input. output is limited to less that 200mA...
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Serial communication using UART or USART of a microcontroller 8051 AVR PIC, software implementation of half-duples UART and MAX232 interfacing with microcontrollers 8051 AVR PIC....
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Because the coupling coefficient is so low, the primary self-inductance tends to short out the driving signal. However, if a series/parallel set of capacitors is used to couple energy, then the input impedance will increase at resonance, thus achieving....
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A cure that we are testing is to prevent the over voltage getting to the irreplaceable IC U5 - A1752CF after either the switch drives or returns are hit with either a static electric shock or the 24VDC solenoid bus. The protection is simple, there needs to....
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A very sensitive pico ammeter (— 1 V/pA) employs the amplifier in the inverting or current summing mode. Care must be taken to eliminate stray currents from flowing into the current summing mode. It takes approximately 5 for the circuit to stabilize to....
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There are currently several nice ICs available that contain a nearly complete receiver. This project is a complete FM receiver circuit with excellent receive and sound qualities. The only disadvantage of using this IC TDA7021T from ST-NXP Wireless, from the....
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Can anyone point me in the direction of a simple useable circuit i can build for testing crystals? I have seen loads of circuits as i am googling....
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It relies on the smoke that is produced in the event of a fire and passes between a bulb and an LDR, the amount of light falling on the LDR decreases. This type of circuit is called optical smoke detector. Do not use it as a home smoke detector it`s jus for....
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One (1) Electronic Ballast circuit circuit shown in Figure 2-11. This circuit uses special fluorescent lamp starter thyristor SCR Y1112, ordinary thyristor phase than having to maintain a higher..
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A half bridge setup with strain gages and a INA126 to amplify the voltage. I can read the voltage fine when the lever is bent one way, but when beding the lever in the opposite direction I don`t get any reading. I`m guessing it`s because the voltage is....
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The circuit in Figure 1 uses a regular, general-purpose transistor as the sensing element and a thermal-diode monitor IC to measure temperature. The ADM1021 usually connects to an on-chip thermal diode on a CPU die itself, but in this application the sensor....
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A modulated current is provided by the integrated rotational speed sensor KMI 15/x. This current signal must be converted to ground referenced voltage signal,...
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Operation of the circuit. Circuit is divided into three parts: low frequency production. The manufacturing high frequency and extension of production low...
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This circuit can switch two or more devices on and off in response to a series of rapid handclaps. The claps are picked up by an electret microphone and amplified by a 741 op amp (IC1). IC1 is configured as an inverting amplifier, with its gain and hence the....
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These is the demo board I made based on PIC16F887 microcontroller. It is a good project for starting with PIC uC`s. It has a bootloader so an external programmer is not needed. The circuit is simple but it will let you explore some of the major features that....
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The compact and low-power temperature-to-frequency converter in Figure 1 is ideally suited for measuring temperature in remote locations. An AD22100A temperature sensor generates a voltage proportional to the ambient temperature. This voltage then drives an....
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This circuit uses a very simple approach to detecting smoke in the air. Quite simply, it uses a bulb as a light source, and an LDR (Light Dependent Resistor) as a light detector. As fire smoke comes between the bulb and LDR, the resistance of the LDR....
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This simple circuit is build around a CMOS IC 4060 to obtain the required timing. During day time the LDR has low resistance and keeps the pin 12 of the IC1 high, preventing the IC1 from oscillating. When it is dark the LDR resistance becomes high and the....
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This circuit relies on extremely high input impedance for effective operation. The HA-5180 with its JFET input stage, performs well as a preamplifier. The standard three amplifier configuration is used with very close matching of the resistor ratios....
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VOUT to be 3V when the switch is open and 5V when the switch is closed. The simulation seems to give me what I want when the switch is open, but not when it`s closed. What am I doing wrong Is there a better way to do this I was avoiding a common cathode....
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The JBL "Bass Wave"amplifier is a small 100-watt amplifier with built-in active filter with a single-pole high-pass at 10 Hz combined with a single-pole lowpass at 85 Hz. It costs an amazingly low $50 US. It also comes with line and speaker-level inputs and....
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This is a circuit for controlling the speed of small DC motors, it works nicely as a speed controller for an HO or N gauge model railroad...