Popular Circuits Page 109
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The SiC MOSFET also has significant advantages including simple drive circuit The silicon carbide (SiC) MOSFET has unique capabilities that make it a superior switch when compared....
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Measuring the voltage converter can be set to switch to the right, left AC voltage range selector switch to any one file, then..
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Below is the main schematic of the RX + Xtall V9. 0 SDR. The schematic has been partitioned into separate stages, each of which is covered in a separate page of build instructions in this web site. You can click on each shaded area and view the corresponding....
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The inverter is nice, thanks for the circuit. Please sir can you send the full function of IC1 and IC2 in this 3000W inverter circuit, to my email: sundawax@yahoo. com First of all i would like to greet you a pleasant day. Sir i am happy when found your....
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This is a very simple RF transmitter circuit that consists of the Holtek HT-12E encoder chip and AM 418MHZ-transmitter module ( WZ-X01 ). Using the hybrid RF xmit/receive modules make building the RF remote control a lot easy. The transmitter can be powered....
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A opamp. medium power, here its used as amplifier of headphones with possibility drive low loads. It contains in a nutshell two amplifiers. The voltage gain, has been determined in 40dB, from the R3-4 and R11-12, for each channel, respectively. The....
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This is a very simple to implement Temperature Sensor. It uses LM35DT as a semiconductor temperature sensor which operates with a +5 volt DC.
It produces an analog output voltage, proportional to the change in surrounding temperature in Celsius scale....
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How to make a combined / dual serial and USB cable for the Nikon Coolpix 990 (e990) camera...
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Water tank overflow liquid level sensor alarm circuit is a simple electronics project for school students. In the previous articles we had discussed about numeric water level indicator and water level controller circuit, but those circuits are much complex....
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Here`s my final mic pre schematic. The input phase switch and phantom power circuit is not shown, but is based on Jensen mic input design AS016. Click here for the discussion thread on this project...
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I am currently following the two guides here: Original Guide Hackerspace/Coding4fun Thundergod Guide using netduino mini This is the basic circuit. But I would l ....
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This is a circuit diagram of a simple circuit in which the LED burning can be activated only by a gust OFF. A condenser mic (M1) is used to feel your breath. When the S1 button is pressed, transistors Q2 and Q3 as a couple wires attached will be activated....
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Build a temperature controller circuit with the 555 IC together with a thermistor resistor divider. The advantage is that a well regulated power supply is not needed. The dividing network consists of adjustable resistor R3, thermistor R4 and R5. When the....
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This current-limiting circuit, shown in this example as part of a small bench power supply, could in principle be used in conjunction with any dual-rail current source. The part of the circuit to the left of the diagram limits the current at the input to the....
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All distances mentioned before can vary, depending on infra-red transmitting and receiving LEDs used and are mostly affected by the color of the reflecting surface. Black surfaces lower greatly the device sensitivity. Obviously, you can use this circuit in....
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Dimmer Switch Introduction Dimmer switch can be used to replace your electrical switch for lamps, heaters, or some types of electric motor. Dimmer switches....
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All you need to do is supply a resistor (I used 200 Ohms, with a 3. 3V supply) to the power line, GND it, then connect the data line to one of your digital pins (I used pin #2)". However, the datasheet shows an example circuit with a 100 Ohm resistor....
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It takes a voltage between 0. 4 and 1. 2 V on pin 5 to control its gain. In the first two versions of the circuit, I used logic ICs and/or counters and an op amp with a resistor network for a DAC to provide the voltage, and all worked well. This last week, I....
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3V FM Transmitter Circuit This project provides the schematic and the parts list needed to construct a 3V FM Transmitter. This FM transmitter is....
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The AM Transmitter circuits in two and a half, audio amplifier and an RF oscillator. The oscillator is built around Q1 and associated components. Tank circuit L1 and VC1 is melodious from about 500kHz to 1600KHz. These components can be used from an old MW....
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This circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the ignition. By adding external relays you can....
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For frequencies below 20 MHz, a fundamental-frequency crystal can be used and the resonant tank is no longer required. Also, at this lower frequency range the typical MECL 10,000 propagation delay of 2 ns becomes small compared to the period of....
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It consists of several gates as a crystal oscillator circuit c Several gates as shown by a crystal oscillator circuit. FIG. (A) to l MHz crystal oscillator circuit, the figure (b) is 20 MHz crystal..
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Micro or analog? These days it is getting harder to choose. The 555 timer was the benchmark of flexibility. How does it fare today?...
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The circuit consists of ICM7208 seven-decade counter U1, ICM7207A oscillator controller U2, and CA3130 biFET op amp U3. IC U1 counts input signals, decodes them to 7-segment format, and outputs signals that are used to drive a 7-digit display. IC U2....
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given motor coil while motor need controllers to adjust position and speed. Then you will needa motor driverto amplify a controller`s low output current to a larger current that is required by a motor. Below is an article that describe you about how to....
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A 555 timer (IC1) generates a 120-Hz signal that is fed to a CD4013BE flip-flop (ICl-a), which divides the input frequency by two to generate a 60-Hz clocking frequency for the FET array (Ql through Q6). ..
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We aim to transmit more information by carrying articles. Please send us an E-mail to wanghuali@hqew. net within 15 days if we are involved in the problems of article content, copyright or other problems. We will delete it soon. ..
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The wide-range current pump for the precision phase locked loop circuit is a semiprecision circuit, and provides an output current proportional to -V1, give or take 10 or 15%, over a 3-decade range. The 22 MW resistors prevent the current from shutting off....
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This project uses a 3909 IC and a few other parts; power is 1.5 volts DC...
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Low frequencies predominantly cover our earths atmosphere. This range of frequency may be created by many different sources which may be quite unknown and strange, a VLF sensor equipment can be made to trace these frequencies for investigating the intriguing....
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This project was a sort of challenge: designing an audio amplifier capable of delivering a decent output power with a minimum parts count, without sacrificing quality. The Power Amplifier section employs only three transistors and a handful of resistors and....
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This circuit adds 120 degrees of phase shift to a 50- or 60-Hz input, regardless of the frequency and amplitude fluctuations ..
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The LM1036 is a DC controlled accent (bass/treble), aggregate and antithesis ambit for stereo applications in car radio, TV and audio systems. An added ascendancy ascribe allows loudness advantage to be artlessly effected. Four ascendancy inputs accommodate....
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A crystal radio receiver is a very simple radio receiver which needs no battery or power source and runs on the power received from radio waves by a long....
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This device is designed to measure the torque in an automobile drive shaft and provide an output to a vehicle data recording system or a portable computer via an RS-232 interface. The received data can then be combined with RPM measurements from the data....
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A microprocessor cannot drive a motor directly, since it cannot supply enough current. Instead, there must be some interface circuitry so that the motor power is supplied from another power source and only the control signals derive from the microprocessor.....
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More and more equipment is sold that runs off internal rechargeable batteries. Although a matching charger is usually supplied in the package, there are a....
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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 U1aG ™s effective input resistor to be about 12. 2K. C2 has a fairly high value in....
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DTMF Based Robo Car Design using 8051 Microcontroller Project. This project presents a method to control a domestic system using the DTMF tone generated by transmitting telephone instrument when the user pushes the keypad buttons of the mobile phone....
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LED indicator in this project can be use in the bike indicator or car direction indicator. Time 555 and BCD 7490 are use with few resistors more than 100+ electronics projects...
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Now day`s audio signal preamp is used in many electronic devices. There are many types of audio preamp circuits from simple to complicated big circuits. Here we are showing you a very good design of a small circuit of signal preamplifier. circuit is best for....
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Using the MAX8844 lithium ion charger IC released by Maxim Semiconductors you can design an very simple and efficiency charger circuit for charging a single cell lithium-ion battery. The MAX8844 lithium ion charger integrate a current-sense circuit, MOSFET....
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2001 chevy s10 headlights some times work some times dont along with dash indicator light. all other lights work fine. I have changed headlight switch, fuse, relay. checked headlight bulbs. all wires to bulbs are possitive. Yes, I took test lamp and hooked....
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This audio converter circuit maintains 40 dB of isolation between the two halves of entry and exit of a four-line son, while allowing a line connecting two son. A balancing potentiometer, R, adjusts the gain of zero lC2to crossing the inlet to the outlet. ..
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This circuit generates a good 1KHz sinewave adopting the inverted Wien bridge configuration (C1-R3 & C2-R4). It features a variable output, low distortion and low output impedance in order to obtain good overload capability. A small filament bulb ensures....
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As shown in Figure is a large high-brightness LED driver circuit for a sufficient drive current, integrated circuits using a 7447A or 74247. Digital display tube has eight ligh..
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This tracking transmitter consists of four distinct subassemblies; a free-running multivibrator, a transmit switch, an audio-tone generator, and an FM transmitter. The multivibrator (which produces a pulse width with a pulse separation of 1500 ms) is built....
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A sensitive and reliable rf field strength meter is an invaluable instrument in amateur radio and in radio controlled model area. A field strength meter is...
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The preamplifier is intended for use with dynamic (moving coil MC) microphones with an impedance up to 200 © and balanced terminals. It is a fairly simple design, which may also be considered as a single stage instrument amplifier based on a Type NE5534 op....
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This tester provides an audible indication of the logic level of the signal presented to its input. A logic high is indicated by a high tone, a logic low is indicated by a low tone, and oscillation is indicated by an alternating tone. The input is high....
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3133 circuit shown in FIG. Figure 3-133 (a), dynamic braking (b), (c) the three lines by manually (button) control. Wherein FIG. (A), (b) the dynamic braking DC power supply wi..
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This circuit uses the 555 timer in an Astable operating mode which generates a continuous output via Pin 3 in the form of a square wave. This turns the LED (D1) on and off. The speed at which the LED (D1) is turned on and off is set by the values of R1 and R2...
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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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The purpose of the terminal interface is to allow my computer to communicate with Minimum Mass Wireless Coupler equipped devices using a terminal emulator program. Consequently, the Base Unit is basically an RS-232 interface and Minimum Mass Wireless....
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The Clapp oscillator is one of several types of electronic oscillator constructed from a transistor (or vacuum tube) and a positive feedback network, . Meissner (Armstrong) Oscillator The Meissner oscillator circuit is a harmonic (sinusoidal) oscillator....
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This project has come about from my desire to control my home heating from work. As I have a VPN between work and home a straightforward relay controlled from a PC would seem the easiest solution. However I also wanted a control unit that I could operate in....
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A clock using numeric neon lamps, also known as nixies. These display devices were common around the sixties and seventies and their use fell off after the invention of LED displays. Nowadays nixies have become valuable oldies and are hard to get even tough....
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Electronic ballasts for dimming fluorescent lamps require a control interface for the user to set the desired lamp-brightness level. Existing interface circuits include a 1-to-10-Vdc interface, digitally-addressable lighting interface (DALI), triac-based....
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The alarm will switch off when the 4 keys connected to "A,B,C,D" are pushed in the right order.The circuit works because each gate `Stands` upon its predecessor.If any key other than the correct key is pushed, then gate 1 is knocked out of the stack, and the....
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The operation of the converter is based on the weighted adding and transferring of the analogue input levels and the digital output levels. It consists of....
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A microphone to listen to a wristwatch and want to cancel the ambient noise in the room. I have included a circuit that I plagiarized from a headphone cancelation circuit. Will this circuit that I have drawn here work. Whoops forgot to include the Schematic....
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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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By the time-base integrated circuit 555, the transistor VT and a few external components to form a multivibrator circuit charge and discharge time constant Ti and V, where Ti 0..
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LEDs are used more and more in motor vehicles, replacing the standard incandescent lamps because they are more energy efficient and have a much longer life expectancy. In this article we describe a simple LED tail light that has been specifically designed....
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The PIC/Generation 1 electronics do not have any form of current limitting. They rely on the stepper motors resistance to keep the current below 2 Amps at 12 Volts. Unfortunatly the more commonly available Steppers of the size used in RepRap have much lower....
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The solar orientation circuit uses a comparator with window control that maintains engine idle as long as the two LDR`s (photoresist) are subjected to the same illumination. In this case, half the voltage is applied to the noninverting input of A1 and A2`s....
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Both transistors are low noise types. In the original circuit, I used BC650C which is an ultra low noise device. These transistors are now hard to find but BC109C are a good re..
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Function: applied in a toilet to keep track of that someone is inside exceeding a certain amount of time. Component: Resistor, IC, Capacitor, Transistor, ....
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The basic two-transistor flasher shown below has found its way into dozens of applications due to its simplicity and versatility. Applications have included such diverse circuits as a micropower low battery indicator, a lightning detector, a off-line....
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The circuit requires only one power-switching device, and you can use an analog or a digital signal to drive the switching device. The circuit also requires only a few components: a diode, a switching transistor or a MOSFET, an inductor or a transformer, and....
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Normally mobile batteries have a lifespan of 2-5 years under normal usage. But then we have to replace them. Nowadays there are cheap replacement batteries which cost no more than 1$. But these low cost batteries run only 6-12 months. What to do with the....
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Im pursuing a homemade photography LED array. Ideally, the LED array will be 6 series 5 parallel. (24 volts @ 1000mA per row). Each LED row is a different wavelength, together they make up the whole spectrum. Each LED row I want to have adjustable so you can....
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Is another kind of connection switch incandescent spider life extension, it has two functions: First, just by electroporation,..
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Connect the longer, positive legs of (anodes) 12 LEDs to digital pins 2-13 through 220 ohm current limiting resistors. Connect the shorter, negative legs (cathodes) to ground. moves through each of the LEDS one by one, from the lowest pin to the highest.....
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The CT Scanner is the abbreviation of computer tomography scanner. The invention of CT Scanner in 1970 was made possible by a previously established insight and development of the dedicated minicomputers. A high DC voltage is applied to the capacitors an....
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The currents listed are maximum values, the actual current used will vary on what the circuits are doing. That precludes just placing a resistor in series to drop 12 to 9 volts and run the units. Note that on each circuit there is a 1N4007 diode in series....
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The 100W4 is a two tube medium frequency transmitter with provision for pre-tuning to three frequencies in MF band and for type A1, A2 and A3 emission. For type A1 the two tubes operate as parallel oscillators and for A2 and A3, looking at the set from the....
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This transmitter has a size about that of a large coat button. The transmitter accepts direct voice input and work on a single watch type button cell that serves several tens of hours together. As shown in schematic the transmitter is probably the simplest....
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This nifty little circuit lets you record your phone conversations automatically. The device connects to the phone line, your tape recorder`s microphone input, and the recorder`s remote control jack. It senses the voltage in the phone line and begins....
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This circuit functions as a line-current sensor and can be connected in series with either of the phone lines. For the circuit to indicate an "in use" status for all phones on a single line, it must be connected in series with the phone line before, or ahead....
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A milliamp meter can be used as a volt meter by adding a series resistance. The resistance needed is the full scale voltage reading divided by the full scale current of the meter movement. So, if you have a 1 milliamp meter and you want to read 0-10 volts....
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Circuit shown in Figure 3-8. It allows the fan when the turn stop, stop for a gradually increasing air volume decreases by a stop, so the cycle repeated. It uses 555 IC A compo..
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Remote controls are part of an electronics device used for operating the device remotely. Remote control has continuously evolved and advanced over recent years. The technologies likebluetoothconnectivity, motion sensor enabled capabilities and voice control....
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This circuit shows an automatic room light circuit diagram. It has a small memory which enables it to automatically switch `on` and switch `off` ....
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The scheme given here is a car stereo amplifier circuit can be used in That car or other vehicle. The circuit is based TDA1553, which is a Class-B audio amplifier. As you can see this circuit is very simple, consisting only of the IC and the capacitor 6.....
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VCO is definitely useful in so many RF projects, wide band Ghz VCO get more concern than VHF/UHF VCO. here is a Manhattan Island Pad construction for VHF VCO, low to 88Mhz and up to around 300Mhz. Here is the schematic, a Seiler oscillator, Voltage....
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A center-tapped 240-V transformer is used with two SCR devices to provide rectified ac (pulsating dc) to MOT1...
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