New Circuits Page 103
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Imagine that is morning, you barely anticipate the bus for work and you can`t find your keys. If you suffer from this situation frequently, this circuit is ideal for you. A fizzle is the only thing you have to do. The overall circuit is small enough to....
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In normal we used to control the industrial equipments by manual operation. Hence it is to be updated step by step manually. It is overcome by a new mode of communication which is used to control all those equipments through a single message from anywhere.....
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One reason why commercial soldering stations are expensive is that, in general, they require the use of soldering irons with inbuilt temperature sensors, such as thermocouples. This circuit eliminates the need for a special sensor because it senses the....
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12AU7 (ECC82) Cathode Follower Tube Preamplifier Schematic. Two stage 12AU7 preamplifier with low impedance output stage. The overall gain is about 8 times..
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The microphone preamplifier circuit design presented in this schematic use SSM2015 produced by Precision Monolithics Inc. (PMI) which offers a high amplification and low noise ( 1. 3nV/ f). Has been designed to work with differential input signals and can....
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Calibrate the measurement circuit by forcing a known conductor current and measuring the resulting voltage output. If sensor to conductor displacement changes, recalibrate This sensor circuit can measure DC and AC currents to the bandwidth of the op-amp.....
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This is DoorBell Bird Voice Electro Suite, to replace the old doorbell, to give the freshness in using the excitement new doorbell....
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Programmed Signetics 8223 256-bit PROM is used as alphameric display having five 7-segment digits connected to form alphameric simulation of abbreviations for second, millisecond, microsecond, hertz, kilohertz, and megahertz as SEC, SEC-3, SEC-6, H2, H2 3,....
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This is a circuit for an intercom is a is a stand-alone electronic communications system intended for limited or private dialogue. Below schematic shows the application circuit of LM390 on intercom. Gain control can be done by capacitively coupling a....
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A couple of years ago I decided I would (eventually) need to replace my decades-old Nakamichi stereo with something more suited to a mobile lifestyle. It was immediately pretty obvious that the Class-D and E switching amplifiers I had researched in the `70s....
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Simple interconnection of RS7490 decade counter RS7447 decoder, and 7-segment digital display for each desired digit makes ideal counter for classroom demonstrations and Sci-ence Fair exhibits, With two additional stages added, display reaches 9999 before....
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The circuit is a LED driver which responds to ambient lightas wellas to the presence of any intruder, and varies its illumination accordingly, lets know more. Also I would like to have an ambient sensor to switch on and off and a proximity sensor to switch....
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There are not many AM transmitters that are easier to build than this one because the inductor is not tapped and has a single winding. There is no need to wind the inductor as it is a readily available RF choke (eg, Jaycar Cat LF-1536). To make the circuit....
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In this circuit, a 120VAC lamp is slowly illuminated over a approximate 20 minute period. The bridge rectifier supplies 120 DC to the MOSFET and 60 watt lamp. A 6.2K, 5 watt resistor and zener diode is used to drop the voltage to 12 volts DC for the circuit....
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The input and output data streams of the I and Q data channels are shown in Pi/4DQPSK System: fc=990 MHz, Data rate = 48. 6 kbits/sec. Note the delay between the input and output data signals. This delay is due to the filters in the modulator and....
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The temperature measuring range of this electronic thermometer is 0-50?, the precision is 0.1?, the measurement results are intuitively displayed by digital display. This electronic thermometer circuit is composed of temperature detection circuit, monostable....
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The Smart Ballast IC is designed to control a Fluorescent Lamp Ballast including a Discontinuous Conduction Mode Power Factor Correction (PFC), a lamp Inverter Control and a High Voltage Level Shift Half-Bridge Driver. The application requires a minimum of....
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This is a flash triggered (photo-driven) circuit which produce a pulse with constant predetermined wide. This circuit can be used to control any device which....
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This circuit is which enables switching on` and off` of appliances through telephone lines. It can be used to switch appliances from any distance, overcoming the limited range of infrared and radio remote controls. The circuit described here can be used to....
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This is a circuit to record the altitude of a R/C-plane. The data is saved on a SD-Card. It uses an ATmega8 microcontroller and a SCP1000 chip to measure temperature and (more important) atmospheric pressure. If you decide to build and use this circuit, you....
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The following circuit shows about 20dB VHF Amplifier Circuit Diagram. This circuit using the BF197 Transistor. Features: simple circuit, with ....
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This circuit use TA7222AP to amplifiers audio signal. The price only $0. 99 and can provide 5. 8 watt with Muting Control. Power supply can use for 8-12Vdc it is a good idea to use for car audio power amp, coin-op machine game, security system etc...
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This simple circuit tells you about the status of phone such as Line OK, Dialing and Call attended. It also has a lock facility to block outgoing calls keeping the incoming calls as usual. This prevents misuse of telephone. The circuit uses only a few....
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This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants` pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 Km. and its dot is....
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As I was developing my IR Extender Circuit, I needed to find a way of measuring the relative intensities of different Infra red light sources. This circuit is the result of my research. I have used a photodiode, SFH2030 as an infra red sensor. A MOSFET....
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The FSK demodulator is the electronics device that converts the FSK signal to serial digital signal. To transmit digital serial data we use FSK modulation and....
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Supply it with a Li-Ion cell, which has 2. 7-4. 2V. I don`t really want/need the complexity of a buck/boost converter. I know I could just regulate it down to anything below 2. 5V, but it still would be great if my circuit would get 3. 3V for Input-Voltages....
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Had noticed balls getting stuck in the ball trough, not loading into an upkicker or not sitting directly on trough ball microswitches/optos, causing the machine to think a ball was missing. My first thoughts were that the ball trough itself had become....
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For one of my classes each student had to pick one of three technology platforms to design, simulate, prototype and then build (PCB layout, ordering, etc) all within ten weeks. The platforms were: H-bridge Motor Controller, Infrared Proximity Sensor and....
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Mode control of the average current CMC Require it in order to control the total waveform of electric current of rebuild of cycle. This text recommend, choose concrete the intersection of voltage transformer and required some step for you, and how design one....
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At the beginning of a design process the designer has to verify which circuit structure is suitable for a given purpose. At this stage numerical and symbolic analysis are of little use. There are no numerical values for conventional simulation with programs....
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This is pressure sensor signal conditioning circuit. It is simple and inexpensive circuit because it has small geometry and simple pressure sensor. It just uses...
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BEAMers tend to learn quickly how to scavenge parts needed to build their projects from technoscrap. But there are always going to be times when buying new parts and/or materials will be necessary. This is getting to be case even more so, as "Application....
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This is a design circuit for a low cost fm antenna booster that can be used to listen to programs from distant FM stations clearly. The antenna fm booster circuit comprises a common-emitter tuned RF preamplifier wired around VHF/UHF transistor 2SC2570....
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Specificaly for the chip that is used in this circuit data are like this: Oscilator runs at freq 200kHz, output noise is below 1% (worst case), max current is 4A at 20V. Voltage can be regulated from 0, 0 V (true zero), to 40 V. Voltage and current limit,....
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Thanks for putting these schematics up, the different circuits look like they`ll be useful for many projects. The CV section alone, is vastly usable. Brilliant! I am in the very beginning stages of making a mighty benjolin PCB with Rob himself. I`m crossing....
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The following diagram is the circuit of Stereo OTL Audio Amplifier. It based on IC circuit, so the circuit looks simple. You can use IC LM379, LM377, LM378 for this amplifier project. Refer to the table, maximum voltage supply for IC LM379 is 28V, it will....
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The infra-red (IR) toggle switch project described here is aimed to provide control mechanism for electrical appliances that do not have remote operation features. The goal is to construct a black box where you can plug-in your 120V AC appliance and control....
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This design combines power-on and low-battery indication, can operate with any battery voltage up to 15V, has very low current drain (2mA or less) and cos....
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I saw a cool app-note from Maxim that described a gamma-photon detector which used a regular PIN-diode as a sensor. The actual circuit looked simple enough so I decided build it, you can never have too many measurement instruments right?....
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This odd little amp was something I designed and built for a shootout at the European Triode Festival in 2007. The topic was "White Light" - amplifiers that use thoriated tungsten tubes. Some great photos of the event can be found here and here. Since it`s....
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The AVO VCM 163 is one of the few tube testers (British: valve tester) being able to measure tube electrode currents, e. g. plate and screen current (fig. 1, left-hand meter movement) as well as mutual conductance (fig. 1, right-hand meter movement)....
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A fairly simple "divide-by-1000" circuit which was first designed by Zeljko Bozic, S52ZB, in a 2006 issue of VHF Communications Magazine. The idea of this project is to extend the range of older (and cheaper) frequency counters. You can often find 100 MHz....
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Next to the CLOCK input shows that it is edge-triggered, that is, it responds to sudden changes in voltage, but not to slow changes or to steady logic levels. The CLOCK input of the 4013 D-type bistable is rising-edge triggered, meaning that it responds only....
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This is a Peak Voltmeter circuit. This circuit can be viewed as a pulse stretcher, which catch fast pulse signal to be measured by a slow response voltmeter....
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amplifier input and output impedance, load and source resistance are strongly mutually dependent in the CC circuit. That`s a reason, why "impedance matching" doesn`t achieve results representative for the circuit operation. Analyzing the circuit as CB with....
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Security is a prime concern in our day-to-day life. And access control system forms a vital link in a security chain. The microcontroller-based digital lock presented here is an The microcontroller-based digital lock presented here is an access control....
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Now, let`s re-examine the function of the TRIS registers. The TRISA and TRISB registers control the direction of data transfer on each pin of Port A and Port B, respectively. The easy way to remember the TRIS register settings is to match the numbers 0 and 1....
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This 40V dual power supply circuit was designed in response to a request made by Michael from Philippines. His application is to power the 150 Watt amplifier circuit published here. I think this power supply design is adequate for the purpose. The....
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High-efficiency step-down switching regulators for positive voltages are very common, however negative step-down switching regulators (negative voltage in, negative voltage out, common ground) are not as well known, even though they are often needed.....
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During nighttime, when no light falls on LDR1, it offers a high resistance at the base junction of transistor T1. So the bias is greatly reduced and T1 doesn`t conduct. Effectively, this removes the common terminal of IC1 from ground and it directs the full....
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The simple motor optical encoder circuit is not terribly difficult however it will take some double checking to make sure you have everything hooked up properly before working the first time. The main devices used in the circuit are the 7805, 18F4520 and....
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This stereo noise blanker or suppressor attenuate the noise with 45dB when the music signal is low or null, is just a noise limiter. The noise blanker sens....
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This heatsink temperature monitor circuit signals via 3 LEDs when the temperature exceeds 2 boundary levels. When the heatsink temperature is below 50 60oC (122 140oF) the greed LED lights. The yellow one signals that the temperature is within 60 and 70oC....
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Take the input from a microphone and use it to power an LED, so that it`s off at ambient sound, and (the peak brightness) gets brighter with noise level. It`s okay if it flickers, I`m just trying to get the peak voltage to be proportional to sound levels.....
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1999 Jeep Cherokee Fuel Pump Wiring Diagram...
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This circuit is designed in response to a request made by Mr Vignesh. What he requested was a circuit for recording and playing voice. I think this circuit is enough for the purpose. This circuit is based on the IC ISD1020A from ISD. The ISD1020A is a CMOS....
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The CM-CU21 is a high quality, portable Commentator Unit. Its sturdy construction and flexibility of features make it suitable for use in a wide variety of environments. It provides two fully featured commentator positions and a third guest position that can....
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I have finally worked out this schematic as an exercise to learn about amps. There are a number of things i am not so sure about and would appreciate....
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A Pierce (crystal) oscillator intended to provide a reliable clock signal for at least 1 year when powered by battery voltages as low as 2.4 V..
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Might be a stupid quiestion but as 240vac-12vac transformers are readily available (and are roughly the same scale) could i use one of these in the circuit instead If the specific transformer mentioned in the schematic is not available to you, any....
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The following circuit shows about 555 Timer IC For IR Detector Circuit. Features: duty cycle of 0.8mSec, frequency of 120Hz and 300 mA peak ....
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Superheterodyne receivers have been mass-produced since around 1924, but for reasons of cost did not become successful until the 1930s. Before the second....
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Michelson was the inventor of a unique interferometer that opened up new vistas in the science of light and optics. With the interferometer, Michelson was able to determine ” with unprecedented accuracy ” the speed of light, the wavelength and frequency of....
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Here is the project/schematic of LM741 dark sensor relay switch circuit. The circuit will activate the relay switch when there is no light on the surface of LDR....
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This simple circuit tests speakers, microphones, transformers and voltage. It`s basically a very low frequency oscillator that produces extremely short `fruity` pulses. The type of sound produced is very easy to hear and to determine the precise direction it....
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This constant current constant voltage SMPS can be used to efficiently charge a battery. This circuit gives 7. 2V at constant voltage mode, and 600 mA at constant current mode. Here is the schematic diagram of the circuit: The mechanism is simple, when the....
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The wide diversity of automotive motor-drivers, including those used for HVAC (heating, ventilation, and air conditioning), headlamp, seat positioning, window, and mirror applications, requires circuits that do more than just switch the motor on and off. The....
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This project was completed during a course on robotics taught by Prof. Dave Barret at Olin College. The final project for the course, the goal of the project was to navigate a maze using a Surveyor robotic platform. As part of this project, additional....
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Before the test point there is an AD744 with its output connected to a 10nF capacitor and after there is 1K resistor that goes to GND, from this node of connection of capacitor/resistor there is a 4. 7k resistor that goes to the TEST POINT...
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The oscillator is designed to tune from 1. 8 GHz to 2 GHz for typical cellular telephony applications. An extended tuning range can be obtained by adjusting the ratio between the varactor capacitance and fixed capacitance in the tank. PMOSFETs are employed....
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An electrocardiogram or ECG (also known as EKG ” abbreviated from the German word Elektro-Kardiographie), is an electrical recording of the heart and is used in the investigation of heart disease. This application makes use of a DrDAQ Data Logger to read and....
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This circuit has an adjustable output timer that will re-trigger at regular intervals. The output period can be anything from a fraction of a second to half-an-hour or more - and it can be made to recur at regular intervals of anything from seconds to days....
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Radio Remote Control using DTMF. Here is a circuit of a remote control unit which makes use of the radio frequency signals to control various electrical appliances. This remote control unit has...
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The Circuit Diagram shows a voltage regulator meeting these requirements that is built from discrete components. The two sets of component values are for a voltage of 6. 3 V (upper) and 12. 6 V (lower). Component: BC547 and BC557 Transistor, Diode, Preset,....
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This circuit tums a sine wave into a square wave. It is comprised of a single 2-input NAND Schmitt trigger that`s conftgured as an inverter with a trigger level adjustment at its input. As the input voltage rises above the gate`s trigger point, the output....
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This circuit is sensitive to low frequency electromagnetic radiation and will detect for example hidden wiring or the field that encompasses a transformer. Pickup is by a radial type inductor, used as a probe which responds well to low frequency changing....
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It is impossible to imagine present day society without any batteries. Count the number of gadgets in your house that are powered from batteries, you will be stunned by the number of batteries you will find. The majority of these devices use penlight....
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Even the energy storage capacitors in even the smallest disposable camera flash operating from a 1. 5 V AA battery can be deadly under the wrong conditions. Line powered devices - even little ones - may have an added danger of high power at high voltage AND....
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Three 2nd order filters are shown, low pass, high pass, and bandpass. Each of these filters will attenuate frequencies outside their passband at a rate of 12dB per octave or 1/4 the voltage amplitude for each octave of frequency increase or decrease outside....