New Circuits Page 78
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Amp with Tone Controls & Soft Switching. Notes: The soft switching is enabled by a BD131 transistor wired as a switch in emitter follower configuration. The collector is wired to a permanent...
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In Greek mythology, a siren was a demonic being (half bird, half woman). Later on this idea was transformed in art into a mermaid: a combination of a fish and a woman. Mechanical and electromechanical versions were invented even later, and electronic models....
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A fingerprint door lock, and the only thing that`s stopping me from purchasing the components is knowing if my setup is going to work or not. Is this an acceptable setup For the actual fingerprint reader, I was going to use this one, , which upon receiving....
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The ISL6553 multiphase PWM control IC together with its companion gate drivers, the HIP6601, HIP6602 or HIP6603 provides a precision voltage regulation system for advanced microprocessors. Multiphase power conversion is a marked departure from earlier single....
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This project uses the similar technique to these products, however it can write a continuous stream of text using a high speed rotor and a strip of LEDs. The word WhirlyGig is derived from the word whirl meaning to spin, and the acronym GIG which stands for....
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With this technique, an extra cable to power the fm antenna amplifier is unnecessary. The RF signal and the DC current supplying the amplifier use the cable simultaneously. Check another FM antenna booster circuit diagram. The RF signal is however prevented....
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This simple circuit is based on the well-known integrated circuit LM3915. The main characteristic of this integrated circuit is its power to manage 10 LED-s (Light Emitting Diodes) in logarithmic scale with a difference between the 3dB LED-s, which it can....
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The right top node is connected to two voltage sources and has three elements. All other nodes also have three elements. Hence, we select the right top node because by this selection, we already know the node voltages of two other nodes, i. e. the ones that....
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This audio power amplifier is very good for your portable devices, or for your headphones amplifier. The circuit of this audio power amplifier is very simple,....
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It is very important to know about the pins of the IC in order to build the circuit. 1GND - Ground, low level (0 V) 2 TRIG -. One day i went to my friends house and noticed that his doorbell gave a sound similar to a cuckkoo bird, whereas mine was a simple....
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Hello, I am going to try some flat mobile active car atenna`s, with a Terratec Cinergy DT USB XS Diversity digital tuner. The antenna has the....
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This voltage to frequency converter circuit has an oscillator that is voltage controlled and has a small, 0. 5% deviation. IC1 function as a multivibrator and produces rectangular impulses with equal width. The output frequency can be easily adjusted with....
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Another feature of this circuit is that you can use the keys "1, 2, 3, 4" of a Philips TV IR remote to turn on or off three relays, The key `4` is used to turn on or off the over temperature alarm. package. LM35 can sense temperature from 0 C to 100 C but it....
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It uses good stability, precision to be high outputting the direct current stream source that can be presetted often in electronic device. The numerical control direct current stream source that this text designs can well lower the output error caused....
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This Wireless Stereo FM Transmitter built from a monolithic IC. The internal structure of this FM transmitter integrated circuit consist of stereo modulator that creates a stereo composite signal, an FM modulator that modulate a carrier frequency with the....
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You might find yourself needing a low power H bridge for driving a motor like I once did. The 555 IC can drive a load up to 200mA, source or sink, which might make is usable as a driver, if one can control the output as desired. Although it is an unusual use....
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This device is a 2 line Audio EMI Filter array designed for speaker applications. It offers greater than 35 dB attenuation at frequencies from 800 MHz to 3. 0 GHz. This device also offers ESD protectionclamping transients from static discharges and ESD....
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tutorials reviews software airsoft Introduction This project illustrates how to connect a PC to a small FRS radio via a simple RS-232 interface. There are several reasons that you may want to....
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At present, it is numerous to adopt the telephone line as long-range control and alarm system of the transmission medium, associated too more research [1, 2 ]. This kind of system is generally made up of alarm device and calling the police to accept the....
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Burst Mode operation maintains high efficiency at light loads by reducing IC quiescent current to 120 A. Light load efficiency is also improved with the reverse inductor current inhibit function which supports discontinuous operation. Additional features....
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Picture three or four small engines occupying the same loop of track and keeping a safe distance as they go round and round. I am sure that many of us have tried this with radio controlled engines but it can be a constant battle to keep them apart especially....
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Electronic FM Telephone Transmitter SchematicThe following schematics design pictures is a circuit diagram FM telephone transmitter that built on a PC board layout which is so small it can simply be fitted within the housing of a telephone creating it an....
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The HARTLEY OSCILLATOR is an improvement over the Armstrong oscillator. Although its frequency stability is not the best possible of all the oscillators, the Hartley oscillator can generate a wide range of frequencies and is very easy to tune. The Hartley....
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The inputs of the 74LS153 chip were mixed, which caused the address block decoding to fail. By now, I know of two Commodore 64 (mine and Pekka Pessi`s) where this expansion has been built, and of four Commodore 128s (of which two expanded by me, and the....
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Exhaust fan is an important component in kitchens. Here is a simple circuit to control kitchen fans by monitoring the ambient temperature. It is built arou....
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There are other display methods than the original 8 led frequency counter has. They are perhaps easier to read and may have a format that fits better to the front of your QRP equipment. Here some examples of binary decimal displays are given. Mostly the the....
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A PIC16F84 introduction with ICSP programmer connection and circuit example....
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for the time in which it gets charged to 0. 6V, the other capacitor has already charged a whole lot(a value which I can`t figure out because the setup does not work until i reach one of the two states-Q1 is on or Q2 is on) The only reason the equation Tl=0.....
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Zilog`s Z8 Encore XP F1680 Series incorporates a best-in-class feature set that is optimized for stepper motor microstepping controls. The features of Z8 Encore! XP F1680 include: A fast 11 MHz internal Oscillator Two Analog Comparators 10-bit....
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For this simple lead acid battery charger we need a center tapped transformer (12V 0V 12V) which need to give a 5 amperes current, two diodes and one capacitor. To charge the batteries we need to connect the terminal + and - from the charger to the same....
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500 Series immersion temperature probe, NTC, 100, 000 Ohm, ±1, 5 °C [2. 7 °F] tolerance, 10 °C to 260 °C [50 °F to 500 °F] accuracy, stainless steel, bullet housing, flying leads (two), 26 gauge Teflon insulation, 4, 267 mm [168 in] ..
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A durable car power inverter can give you a more convenient life. 100W car power inverter is the best choice for traveler when driving outside, or meeting an urgent need when power failure. AC adapter can be widely fit to all kinds of electrical devices....
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An R/C electric motor that has a 10K thermistor sensor built into it, which is connected to a speed control that has basic thermal protection. I would like to build a secondary sensor board that displays the temperature on a segment display, but I still want....
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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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The last thing to do is to wire the IR LEDs, the resistors, and the IR receivers into the Arduino. First, connect the +5v prongs of the IR receivers (right prong if facing the receiver) using the red wires. They should be directly hooked up to the +5 volt....
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PCM Powercom was founded in 1987, a leading provider of power protection products with ISO 9001 certificate. There are over 2,600 employees around the world...
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Many times we have found itself in the necessity to use a Zener diode and cannot to know the voltage of operation. Many times we cannot read the characteristics or the type that is written on her....
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The decimal value of the eight input lines is displayed on three seven-segment displays. Although chips exist to perform this function for single displays, none include the possibility of displaying numbers greater than 9. No EPROM is necessary in this....
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This circuit was developed to charge the Lithium-Polymer cells used in a model aircraft. Lithium-Polymer cells are incredibly lightweight compared to Ni-c....
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The circuit diagram shows the original Kodax MAX Flash Unit including the semiconductors that built the circuit. The shown circuit diagram is the unmodified one which is for the regular Kodak and the Kodak Max that should be very similar if not identical.....
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Anyone able to help? The plan is an audio volume control using 40 relay-operated L-pad attenuators per stereo channel. Control is passed in succession to the relay a....
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The grain measures the main technical indicator of grain quality to includes miscellaneous rate and volume density, not only determine grade and price of the grain, but also know direct influence it processes quality and edible quality. And stipulate the....
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The following circuit is an improved version of my original Lightning Detector designed to run on a 5 volt supply. The new circuit features a superior RF section with a single resonance near 300kHz and plenty of sensitivity. The potentiometer was eliminated;....
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The TRF1400 VHF/UHF RZ ASK remote control receiver is specifically designed for RZ ASK (return-to-zero amplitude-shift keyed) commu- nications systems operating in the 200-MHz to 450-MHz band. This device is targeted for use in automotive and home security....
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The circuit includes two synchronized multivibrators which are composed ofone pair of 555time base circuits. The circuit can output two synchronized pulse signals,and the spacing and frequency can be changed by adjusting the time constant. The circuit is....
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A circuit such that the microcontroller can toggle a GPIO pin and shut the whole system (including microcontroller itself) down. And when the user presses a momentary button, the power is brought back up again. The circuit is normally powered down. When the....
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The following diagram is the FM transmitter circuit with FM transmision up to 4W. Voltage supply for this circuit is 12-16V with current consumption of 100-400mA. This circuit works with frequency of emission range of 88-108MHz. Components....
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This up/down timer was designed to control a power antenna on a late-model vehicle. Normally, this vehicle uses a body computer to control the antenna. However, the person who owned the vehicle wanted to install his own high-powered audio stereo system. The....
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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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Logic power control of analog regulator can be useful in application where a digital circuit/controller need to control power source, such as in EEPROM programmer or other power controls. This is a circuit provide ON-OFF control for 78xx regulator using....
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It is obvious, a slice of SM2965 includes canonial 80C32, FLASH, E2PROM 28SF512, SRAM static data storage And WDT watchdog`s timer SM2965 is that the cost performance is extremely quite high The one piece Computer. And its ISP characteristic makes FLASH....
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There is one important low-impedance node in the whole circuit. That`s the frame and the cross in the middle. Let`s call that 0v. The top voltage source is connected to the middle via that 1k resistor, that means the lower voltage source has priority. the....
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As the robot`s battery voltage would slowly drop, the servo`s centre point would drift. After a while, one or both servo motors would begin to creep even though they should have been stopped. Secondly, servos are designed to hold a position and not a set....
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FM transmitter or often called fm transmitter uses 2 transistors in this article uses 2 transistors 2n2222. If the fm transmitter is in use voltage supply of 9 volt battery and use an antenna whose length is less than 12 inches, then this fm transmitter will....
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Designing various electronic circuit system (synthesizer, modem, decoder, data converter, etc) of ten need a frequency modulator subsystem. An FM modulator is...
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In this Tutorial we are using atmega8 with 4 MHZ Crystal and unipolar stepper motors, ULN2003 is Darlington pair driver I.C s used ..
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The RH1078M is a micropower dual op amp in the standard 8-pin configuration. This device is optimized for single supply operation at 5V. Specifications for ±15V are also provided. Linear Technology offers many demo boards free of charge to qualified....
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This is a design circuit for generates a good 1 KHz sine wave 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. The figure is....
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A footstepping effort-based locomotion interface is described. Built around an inexpensive and readily-available exercise machine, it provides an effective interface to walk-through VEs....
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Every IC on the I ²C bus requires a unique address. Usually such ICs can select from a set of 2 to 8 possible addresses to allow multiple chips of the same type on one bus. The SAA1064 can select from 4 different addresses by applying a specific voltage on....
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Infrared (IR) Motion Detector Circuit with motion detector alarm and infrared sensor.The motion sensor circuit diagram and working is given in detail....
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Audio amplifier circuit board DUAL LOW NOISE EQUALIZER AMPLIFIER The KA2221 is a monolithic integrated circuit consisting of 2-channel low noise amplifiers and regulated power supp;y for car stereos. FEATURES suitable for car stereos. Low noise amplifier.....
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An infrared remote control car, the AT89S51 microcontroller as the core controller, DC motor with L289 drivers work to control the operation of car in this section with infrared remote control manual car driving, autopilot, tracing forward and other....
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The circuit uses a 555 timer IC configured as an astable multivibrator, i. e. , it generates a continuous signal of a set frequency as long as its reset pin (pin 4) is held high. Since the ultrasonic transducer used in this circuit is one designed to vibrate....
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An audio power amplifier can boost weak signals from a tuner, CD player, or tape deck to fill a room with sound. This article focuses on the operating principles and circuitry of low-frequency power amplifiers based on the bipolar junction transistor (BJT).....
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A NE555 IC is used for designing the variable low frequency oscillator and schematic is also given....
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A very simple 10 LED roulette wheel circuit is shown here. pressing the button starts the LEDs in a rotational motion (sequencing) at full swing initially, and gradually slows down, until it stops to a particular, randomly selected LED. The randomness of the....
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If the ramp driving your PWM-based controller isn`t linear or monotonic, or just plain noisy, your DC/DC converter isn`t going to work up to its capabilities. Here`s what you need to know to get the best performance from your system. Today`s typical DC/DC....
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Wave-filter principles are applied in many circuits other than filters. An example is the design of modulation transformers for high-level amplitude-modulated radio transmitters. Some of these transformers are large. In plate-modulated power amplifiers, the....
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As explained elsewhere in this article set, after an equipment failure I decided to replace a combination inverter/charger unit with individual components that fill the same needs. The combination unit (the "Everything Box") is an efficient way to save costs....
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Breadboard and test the DIY IR jammer last weekend but it`s taken me this long to carve out a minute to post the results. The schematic is correct and only took a few minutes to re-create on the plugboard. For power I used a small bench supply set to 6 volts....
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This device adopts encoding and decoding circuit MC145026/ MC145027 and RF transmitter / receiver module TDA1808/ TDA1809, and it can beflexibly operated inthe range of 10~120m, and people have no need to change orginal mouse eterior apperance and inside....
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First introduced by the Signetics Corporation as the SE555/NE555 about 1971. Pin connections and functions: (See schematic below for basic circuits) Pin 1 (Ground) - The ground (or common) pin is the most-negative supply potential of the device, which is....
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hi this my 1st post here. topic is a watch crystal oscillator for PIC (microcontroller). i do not want to use logic gates. here the circuit (a thread....
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The LM35 series are precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. The output of sensor converted to digital that easy connecting with microcontroller. Fig. 1 shows how....
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Three schematics for those of you who would like to build your own. If you know how to read electronic schematics, the three stun gun circuits on this page include all the information you need to make a stun gun. Personally I have no idea what they mean...
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This be battery charger the automatic circuit again interesting circuit. Because of use IC LM324 then make economize. And can charger get both of battery 12V sizes and 6V with the filtration that at S1. Certainly circuit this still base property be when....
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Ford Thunderbird 1997 - Turned blower/fan on for air conditioning heard a snap under instrument panel - no air/blow for a/c, heater or defrost. Checked blade fuse ok. Could my blower switch be bad, or inline fuse or bad resistor You will have to check all....
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First and foremost, if you are not handy with tools and electrical systems, please. hire an electrician instead of trying to undertake this task yourself. And have the electrician read this page for specific cautions and advice. I offer this advice because a....
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The UDA1343TT is a single-chip stereo Analog-to-digital Converter (ADC) and digital-to-analog Converter (DAC) with basic signal processing features employing bitstream conversion techniques. The low power consumption, the small package size and low voltage....
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Digital Thermometer 0-100. 0 °C is a digital thermometer that operates in mode temperature measurement in Celsius ( ° C). Digital Thermometer 0-100. 0 ° C in this article uses data processor in the form of a microcontroller AT89C4051. Temperature sensors....
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This portable am fm radio circuit is designed using the LA1800 IC and some other external components. As you can see in this circuit diagram the LA1800 manufactured by Sanyo Semiconductors, require few additional components. Also the output signal is driven....
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This two-zone alarm has automatic exit, entry and siren cut-off timers. It was developed for the Beginner`s Guide To Cmos Timers. So it has a particularly detailed circuit description. There`s an optional One-Time-Only module. It will force the siren to....
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The optical key works as an infrared door opener for house, garage and the likes. Diagram 27. 0 functions as the key. It is a transmitter module which sends out a modulated infrared (IR) beam. The modulating frequency can be adjusted through P1. Diagram 27.....
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How to make a simple induction heater. This project is really simple, and surprisingly effective at heating metals using high frequency magnetic fields....
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The diagram shows telephone control automatic lighting circuit. At night, when telephone rings or master takes up telephone transmitter dialing, the light can lighten; when telephone ringer stopped (no one listen) or on-hook, it can delay 10~40s, then the....