New Circuits Page 12
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When I first built the Heart rate measurement through fingertip project, the infrared LED and photodiode used for finger photoplethysmography were actually from salvaged parts, and therefore, I could not provide specifications for them in the article. As a....
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A very simple multiway active speaker audio systems can be designed using the TDA2030 audio IC. This TDA2030 active speaker audio system circuit is designed to provide the best possible acoustic performance since each loudspeaker is specially designed and....
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Programmable Timer in this website is very simple made from only 2 iC of wide range circuit and description of programmable timer various timer project...
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The electronic locust killer device is composed of the square wave oscillator circuit and high-voltage generator circuit, and the cirucuit is shown in Figure 3-192. Square-wave oscillator is composed of the counting divider lC and resistors R5, R6, capacitor....
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In this laboratory experiment, we need to design the frequency determining network for a 1k Hz sinusoidal oscillator. Therefore, we should set:
Capacitance = 100nF
Resistance = 1520 ohm ..
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Active amplified transformer isolated signal splitter that enables hum-free connection of1-guitar to more than1-amp as well as having a direct output Transformers for Audio Interfacing: Discussion on using audio transformers in equipment interconnections,....
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Part Fill valves are widely used in Rainwater tanks. The valve will open once the water level in the tank has fallen to a low posit....
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The ADUC831 MicroConverter is a fully integrated 12-bit data acquisition system-on-a-chip. Like all of ADI`s MicroConverter products, it features precision A/D & D/A conversion and a Flash Microcontroller on a single chip. For detailed documentation on the....
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The UDA1350AH is a single chip IEC 958 Audio decoder with an integrated stereo digital-to-analog converter employing bitstream conversion techniques. Besides the UDA1350AH which is the full featured version in QFP44 package, there also exists the UDA1350ATS.....
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FIG. 1 (A) illustrates the circuit diagram of one embodiment of the fluid level detector of the present design. The supply voltage for this circuit is typically provided by a 12-volt automobile battery which is reduced to a 5-volt DC source voltage by means....
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TCA440 is a AM receiver circuit for LW, MW and SW in battery and line operated radio receivers. It includes an RF prestage with AGC, a balanced mixer, sepa....
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The biggest issue is that the RDS_on of the used MOSFETS is, driven with 5V gate voltage, too low. The other issue is that the the reverse voltage that occurs, when the MOSFET switches from on to off state kills the transistor. This revese voltage is caused....
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On-Glass Antenna Amplifi er AGC IC LA1070 The LA1070 is an Automatic gain control IC for use with automotive on-glass Antennas By Sanyo Semiconductor Corporation ..
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A symmetrical power supply, can be designed using this circuit diagram. This symmetrical power supply is designed using a simple operational amplifier and some classic electronic components Resistances R1 and R2 form a high impedance voltage divider.....
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9-line telephone sharer This circuit is able to handle nine independent telephones (using a single telephone line pair) located at nine different locations, pdf file Bidirectional telephone line simulator without using telephone lines, couple, test and....
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These are two - easy to build - relay-based alarms. You can use them to protect your motorcycle - but they have many more applications. If you use relays with 6-volt coils - they`ll protect your "Classic Bike". Both alarms are very small. The completed....
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This is a 2-station simple intercom circuit build based on transistors part and using common 8R mini speakers. The speaker works as microphone and generate sound, so there is no need microphone for this intercom. The "press-to-talk" switches should have a....
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Usually a single telephone is connected to a telephone line. If another telephone is required at some distance, a parallel line is taken for connecting the other telephone. In this simple parallel line operation, the main problem is loss of privacy besides....
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I have designed this high voltage, low current power supply for various experiments in systems & synthetic biology. I have cleaned up the design and I am placing the schematic and board layout online below! This circuit outputs up to +1, 866VDC at under 1 mA....
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When trying to move things with microcontrollers, there are basically three kinds of motors that are most useful: DC motors, servomotors, and stepper motors. Most all motors work on the electrical principle of induction. When you put electric current through....
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A sensor in garden railway applications. Hall Effect sensors are the electronic equivalent of a reed switch. You can think of them as a cross between a reed switch and a transistor. They are frequently used to determine the rotational speed of a spinning....
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This project displays how the Nokia 3310 LCD can be interfaced and driven using the PIC16F628 microcontroller. The code is written in Hi-Tech C and the character table is embeded in the source code. The Nokia LCD has 84x48 pixels and is divided to operate in....
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This simple micro-control circuit controls a servo motor according to a 3-state switch. A servo motor acts as an actuator in 3 position. It has 3 wires, one for VCC, one for Ground and another one for position control. The last signal is a single pulse with....
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Later in the sixties, the first distortion effect boxes were made to simulate the sound of razored cones and overdriven amps. Now, most amps have a distortion control, but distortion effects are still popular. Now we`re going to discuss the methods of....
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This metal detector circuit diagram is based on the TDA0161 monolithic integrated circuit, designed for metallic body detection by detecting the variations in high frequency Eddy current losses. Output signal is determined by supply current changes.....
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The circuit is Easy to construct. TDA2003 is an integrated radio amplifier from ST Micro electronics that like short circuit protection for all pins, thermal over low harmonic distortion, low cross over distortion etc. In the circuit given here TDA2003 is....
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When firs time found this article, i think it`s a great project using only few component. I like microcontroller project based on LED. And as you know this project very simple. I must try it. one day "I was always fascinated by the emergence of patterns. One....
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This page exists as a repository for items you may need to consult from time to time, such as identification guides, diagrams, etc. There is also a project in the works to make the S130 fiche easier to navigate and find what you`re looking for. You`ll need....
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Make Z3801A GPS-disciplined oscillators more useful by making 1 PPS and additional 10MHz signals available on the rear panel, and providing a 1 PPS signal on the DCD line of the serial connector so the unit could serve as a reference clock for an NTP server.....
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A laser trip wire that actuates a camera. An ambient light sensor by Vishay, the TEMT6000 [ datasheet ] from Sparkfun Electronics, acts as an NPN transistor attached to a 555 in BiStable mode. The output is sent to a logicinverter for quick visual status,....
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Circuit stereo TDA2822 audio power amplifier circuit schematics Circuit Electronics, 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....
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Here is the fuse block diagram, with the Aux Pwr fuse highlighted. I would check both sides of the fuse with a test light or multimeter to make sure it is working at that point. I am assuming that you have checked for power at the Aux Power socket - center....
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This is the Transistor tester into the Circuit or PCB. When your project do not works, the tester electronic parts or....
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The M-88L70 is a full DTMF Receiver that integrates both bandsplit Filter and decoder functions into a single 18-pin DIP or SOIC package. Manufactured using CMOS process technology, the M-88L70 offers low power consumption (18 mW max), precise data handling....
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This is the simple freeze protector circuit diagram. It is also called timing circuit. It is just hobby project for beginners. When you need to operate automatically any device in the fixed time later after coming AC power supply, you can use this circuit.....
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Using the LTC3810-5 synchronous step-down switching regulator controller can be designed a very easy and simple 12 volt switching power supply electronic project using few external electronic parts. LTC3810-5 synchronous step-down switching regulator....
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A practical amplifier circuit An electronic amplifier is a device for increasing the power of a signal. It does this by taking energy from a power supply and controlling the output to match the input signal shape but with a larger amplitude....
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This is a project for those who want to build their very own Automatic Battery Charger. This is a project made by duc_tech....
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The longer the locks are not used with either the remote or central lock button, the stronger the power surge to the door lock motors. After being "activated" even once, it is like it drains all the power out of the capacitor or whatever stores the charge if....
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This Car audio amplifier gives ouput of 40w from 2 ohm speaker. his car amplifier circuit gives an output power 40 watts per channel at 2 ohm load, and 22 Watts on 4 ohms load. Perhaps you are wondering how to get 40 watts of power And answer is : you can....
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You check the voltage at the anode and cathode of the diodes and determine whether or not it is conducting. With a current source I am kind of confused on what to do. I can`t determine the state of the diodes for a given input combination (00, 01,10, 11)....
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There are now extremely wideband software defined radios (SDR) where the wideband antenna is a natural choice. Wideband small magnetic loops (WSM loop) are used already 3-4 decades and I was curious to see what can be reached with them and to evaluate their....
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This ultrasonic anemometer serves for the 2-dimensional capture of the horizontal components of the wind speed and the wind direction as well as the virtual temperature. On account of the high measuring rate this device is suited very well to capture gusts....
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The National Semiconductor LMV225 is a linear RF power meter IC in an SMD package. It can be used over the frequency range of 450 MHz to 2000 MHz and requ....
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We can use a voltage-controlled current source to implement a laser diode driver. Compared with a a Switched (PWM) drivers, this simple linear laser diode....
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The 1K resistors in the circuit are essential so that the LED`s turn on at different audio levels. This circuit is easily expandable with more op-amps, and is not limited to use with the LM324. The 33K resistor on the schematic is to keep the signal input to....
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This circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing LEDs arranged in a pseudo-rotating order. Due to low voltage, low drain battery operation and small size, the device is suitable for mounting on bicycles....
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The circuit comprises a 555 IC as the core. This is designed to work as an astable multivibrator. When we connect a positive 9 volt to pin no. 8, the circuit will produce a sound through speaker. But here the connection to pin 8 goes through the transistor....
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IperCODE is a didactic project, with which it is possible to build a remote control acquisition system, based on the rolling code and to have the possibility to transmit the received code on RS232 serial port, to visualize it on the 16X2 display or to....
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In this circuit, an SCR is used to slowly vary the intensity of a 120 volt light bulb by controlling the time that the AC line voltage is applied to the lamp during each half cycle....
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This is a good project on GSM Based Home Automation and submitted in partial fulfillment of the requirements for the degree of bachelor of technology in Electronics and Communication engineering. The goal of the project is to develop a system, which uses....
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This sound frequency meter circuit is simple to build and can be constructed in a portable format. In can measure frequencies with a minimum level of 10 mV...
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The following circuit was designed by me in response to the request sent by PP. The article describes an LED emergency light circuit with advanced features such as, over charge battery cut off, day time auto-disable, and need less to say that the circuit....
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This circuit detects when a tube is empty and pulses a piezo buzzer in. 5 second intervals. I have it working with 5v on a breadboard, but I need to move it to 12v from a wall wart. Secondly, with 12v R1 should be 220 1W, but I want to stick with 1/4W....
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Here is a very simple telephone broadcaster transmitter which can be used to eavesdrop on a telephone conversation. The circuit can also be used as a wireless telephone amplifier. One important feature of this phone transmitter is that the circuit derives....
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Fluorescent tubes use far less energy than incandescent lamps and fluorescent tubes last a great deal longer as well. Other advantages are diffuse, glare-free lighting and low heat output. For these reasons, fluorescent lighting is the natural choice in....
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This circuit is composed of the light measurement circuit and the flash circuit, as the figure shows. It can be used in the POPTICS (one kind of popular integration camera), the Franka X-500 and the WIZEN-860S cameras. It is composed of the following....
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We are using 6v/2amps 1. 8degree stepper motor. In this circuit CD4050 hex buffer using to connect to the microcontroller. The output of cd4050 is connected to the TIP122 of the BASE. The Emitter and collecter is conneted to 1N4007 diode the colleter of....
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6DJ8 Tube RIAA Phono and Line Preamplifier Schematic. The HT power supply uses tube rectification and regulation..
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The FM modulator circuit (frequency modulation) is built with a Motorola MC1648P oscillator. Two varactors, Motorola MV-209 are used to frequency modulate the oscillator. The 5000 ? potentiometer is used to bias the varactors for the best linearity. The....
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Ok first of all I am sort of a complete noob I made a `crystal` radio circuit from parts i got out of an old busted radio, a LM386N audio amplifier ....
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The Arduino GSM Shield connects your Arduino to the internet using the GPRS wireless network. Just plug this module onto your Arduino board, plug in a SIM card from an operator offering GPRS coverage and follow a few simple instructions to start controlling....
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The circuit exemplifies the use of ZN414 IC to produce a handy AM radio receiver. ZN414 IC a composition of transistor tuned radio frequency (TRF) circui....
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In some situations, it can be helpful to set up two (or more!) Arduino boards to share information with each other. In this example, two Arduinos are programmed to communicate with one another in a Master Reader/Slave Sender configuration via the I2C....
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This is a project of a 555 buzzer circuit. NE555 is a timer IC comes in 8 pin dip package, it performs wide variety of tasks in electronic circuits. The circuit mentioned below will produce a buzzer sound when 9 volt power will be applied. The frequency of....
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Using TOP269EG off-line switcher IC, (U1), in a flyback configuration can be designed a very simple high efficiency notebok laptop power adapter. TOP269EG IC has an integrated 725 V MOSFET and a multi-mode controller. It regulates the output by adjusting the....
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Most, if not all, recent cars have an impressive amount of electronics, whether it be ABS brake systems, engine control with injection calculators, airbag activation, or other various functions, called comfort functions. Among them is one which we tend to....
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With this simple temperature to voltage converter circuit we can do a precise measurement of the temperature in a room. A NTC resistor or a thermistor is u....
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The Anderson Loop is the simplest detector. Most hams don`t refer to it as an Anderson Loop, and I`ve only seen the loop described as such by the folks who patented it. A good example of an analyzer that uses this detector is the VK5JST Aerial Analyzer.....
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The high and low voltage cut-off with delay and alarm circuit with circuit diagram is explained in this post....
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IC1A op-amp is wired as an inverting amplifier, having its gain set by a three ways switch inserting different value resistors in parallel to R4. This input stage is followed by an active three-band tone control stage having unity gain when controls are set....
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This Battery Back-up circuit can be added to surveillance systems or control like alarms to power the circuit during Mains power failure. the battery back-up will immediatly take up the load without any delay the circuit is simple to construct. Regulator IC....
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This is a design circuit for alarm. This circuit is for an anti- theft wireless alarm can be used with any vehicle having 6 to 12 volt DC supply system. The mini VHF FM radio-controlled, FM transmitter is fitted in the vehicle at night when it is parked in....
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Good information about RF Field Strength Meter Circuit. You can learn and download RF Field Strength Meter Circuit online here....
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The dark detector circuit shown here can be used to produce an audible alarm when the light inside a room goes OFF. The circuit is build around timer IC NE555. A general purpose LDR is used for sensing the light. When proper light is falling on the LDR its....
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Any NPN transistor can be used. The author used a 2N3904, but a 2N2222A should work just as well. A good, low noise transistor would be even better. Some radios only have three connections to their ferrite bar antenna: the antenna connection to the tuning....
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When running 12V electronic devices from lead-acid battery banks, the voltage to the appliance can vary from below 11V with discharged batteries, to well above 14V during charging. Many appliances will not tolerate such a wide fluctuation and may perform....
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Unplugging or re-connecting equipment to the serial COM or PS2 connector always gives problems if the PC is running. Even if you only need to swap a mouse or changeover from a graphics keyboard to a standard keyboard. The chances are that the connected....
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amplifier, with bias at cutoff. Q5 acts much like a grid-leak detector. Without the subcarrier input, the demodulator cuts off and prevents signals from passing. Of course, the chroma signal must be at a low level. Otherwise, chroma might gate the....
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Frequency signal tracking circuit is the phase-locked loop circuit, which is one of the basic application circuit of CD4046. The circuit shown as the chart and composed of CD4046 is a PLL circuit, and it can capture and track the input signal with the input....