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This is a special low voltage version of my audio preamp. T1`s emitter voltage is biased close to half supply voltage (1. 5V) to allow for maximum output voltage swing. Both transistors are direct coupled and have closed loop feedback to aid temperature....
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A circuit for monitoring supply voltages of ±5 V and ±12 V is readily constructed as shown in the diagram. It is appreciably simpler than the usual monitors that use comparators, and AND gates. The circuit is not intended to indicate the level of the inputs.....
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This Line Following Robot sensor or surface scanner for robots is a very simple, stamp-sized, short range (5-10mm) Infrared proximity detector wired around...
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The SciSys Leonardo and Saitek Galileo and Renaissance chess computers could be connected to a PC via an OSA-Link cable. Such a cable is needed to run the OSA-4-Arena software and other tools. Unfortunately that cable is no longer available. Special....
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This simple temperature relay circuit can be used to signal a fire or setpoint for temperature monitoring function. You need to adjust P1 so that T1`s base....
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get in the loop, aux send is an in-studio performance web show and podcast dedicated to featuring unique, diverse, and brilliant independent musicians...
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The simplest of all motor controllers (besides a beeline on/off switch) is the contactor controller. I advised this contactor ambassador for use in my electric scooter project. It is based about three 12V relays, two 12V batteries, two switches and of....
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This voltage to current converter uses three op amps to drive a pair of power transistors. The current output is calculated as: IOUT=Vin/R6 Output resistance is over 50 M?. IOUT can range from 1 mA to the current ratings of T1 and T2....
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guys i need a 2 circuit the one is when power applied the timer will trigger and the relay will remain off when the timer runs out the relay will turn ....
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The supply generates a low voltage (<18 Volt) low current 3 phase sinosoidal waveform. This waveform is used to switch high power MOSFETs on and off producing a 3 phase high current square wave output. Yes. yes you`ll get all sorts of harmonics and noise....
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The switch shut off time delay circuit is shown as below. The switch shut off time delay circuit is composed of the timer, optocouplers, bridge SCR, SCR AC switch. When the control button is released, the keeping motor or other AC start power for 1 hour.....
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escriptipn: The following circuit shows about Railway Turnout Control Circuit Diagram. Features: logic level in the range of 512 V, used to control model ....
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One of the EL34 output valves had blown, the normally silver coloured getter had turned white completely. When I opened the amp, I noticed the remains of a trimpot, including some melted solder, lying on the bottom cover of the amp. Its value was only just....
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TLD 5085EJ is a smart LED buck converter with an integrated power switch capable of driving up to 1. 8A load current with excellent line and load regulation. This device is primarily aimed at stepping down input voltage and regulating a constant LED current.....
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Input voltage from aerial voltage DC DC advocate is 12V AC at 800mA accepted and again adapted to DC through a arch rectifier Diode 1A. The voltage achievement of advocate ambit can be adapted in the ambit of 0-1000V DC. This aerial voltage DC DC advocate....
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Here i-St@r comes with thesimplest mini audio amplifier circuitschematicusing LM386 low voltage audio power amplifier IC. This circuit is applicable to power medium sized speakers from a music player that can only drive earphones (lm386 headphone). The LM386....
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This circuit enables you to test quartz resonators at the range values from 32kHz to 24MHz. Confirmation of good state of quartz resonator is done by diode signalling LED and acoustic signal. Switch S2 enables change of range...
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The following circuit shows about Bass-treble Tone Control Circuit electronic circuit diagram. This circuit based on the LM1035N IC. Features: 0. 3 Vrms input level, 80 dB Signal noise, 75 dB volume control, ±15 dB typical Tone Control, 75 dB Channel....
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This Hartley oscillator was built on the remains of a single tube Hartley using a single 45. The original circuit I constructed was one that was published in a 1932 QST article by George Grammer. As it turned out, both of the 45s I had were weak, so the....
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The SSM22111 is a high performance audio amplifier that delivers 1 W rms of low distortion audio power into a bridge-connected 8 © speaker load (or 1. 5 W rms into a 4 © load). The SSM2211 operates over a wide temperature range and is specified for single-....
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This circuit charges two NiCad cells with a constant current and features dual charging rates, voltage cutoff and an audible alarm. The circuit is powered by a 12VAC centre-tapped mains transformer, together with two rectifier diodes (D1 & D2) and a 1000mF....
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Connect the 25VAC output to diodes bridge with capacitor (3300uF - 25v) to the positive and negative pins to eventually get 25VDC. What I want is to reduce the 25VDC to 17VDC, I thought i could build voltage divider with variable resistor to get the volt I....
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555 IC is very popular component for timer circuit. With integrator circuit, we can extend the timing period of 555IC timer with reasonable capacitor size....
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This section gives step-by-step instructions along with photos to the construction of Ultrasonic Proximity Transmitter. Because this is a very simple circuit, only a schematic for the sensor is shown here: (For the PDF format click here. ) This tutorial`s....
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The following circuit shows about Automatic Light Dimmer Circuit Diagram using 1N4007 Diode. Features: built into a wall-mounted box containing ...
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The schematic for the pulse width monitor. The heart of the circuit is the transistor current source which charges cap C10 to form an integrator. The theory is that the cap is charged and the voltage across it increases linearly for the amount of time that....
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If you need to hold an analog signal for infinite period then this digital sample and hold circuit is the solution. This circuit uses a Exar XR-2240 programmable timer/counter as main component. The Exar XR-2240 is triggered when strobe input is applied. The....
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This toy traffic signal uses a single low-cost hex Schmitt-trigger inverter IC (IC1a-IC1f) to directly drive three coloured LEDs (red, green and amber). At switch-on, the circuit lights the red signal for 30s, then shows green for 6s, then amber for 3s. It....
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A circuit diagram for a mini battery-powered version of roulette is shown, This circuit uses a 4017 decade counter (IC2) driving 10 LEDs. Because only one LED is ever illuminated at any one time, a common limiting resistor R4 is used. They can also be placed....
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This is a MOSFET transistor based power amplifier circuit that can be operated between +35V to -35V range. The input voltage is pre filtered and pre amplified before applying to the MOSFET switch. The pre audio amplifier is a differential amplifier section....
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Most people believe spark gap Tesla Coils can only be operated from high voltages - typically 4 - 15kV or more. But some unusual experiments can be made with as little as 240V - directly. Outside of very low frequency Pancake Coils, there is little practical....
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The LM35 of National Semiconductors that is used in this project is a precision centigrade temperature sensor, which has an analog output voltage. It has a range of -55 C to +150 C and an accuracy of ±0. 5 C. The output voltage is 10mV/ C. The output voltage....
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CMX7031Q1 is a sub package of CMX7031, If you need see the description, please click CMX7031. If you need CMX7031Q1`s datasheet, please download it from below. By Consumer Microcircuits Limited ..
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The ICX424 Minimal Head (A2075) holds a single ICX424 image sensor and an optional pair of illumination LEDs. Power and drive signals enter the circuit board through a twelve-way flex connector. Three capacitors provide local de-coupling of the supplies. The....
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It s entirely logical that low-cost miniature microcontrollers have fewer ˜legs than their bigger brothers and sisters some-times too few. The author has given some consideration to how to economise on pins, making them do the work of several. It occurred....
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Is based on the FTDI`s USB / serial IC FT-232BM. The adapter has been successfully tested with the following transceivers and software: VX-7R (VX-7R Commander), FT-8900 (FTB-8900), FT-817 (FT-817 Commander and Ham Radio Deluxe) and IC-706MkIIG (Ham Radio....
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Since then NL has evolved into the Microsoft Windows ®-based NL4, which has been used extensively by world-class engineers in different fields of electronics for almost 10 years. NL5 is the first version to be publicly available. Unlike conventional....
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All coils are designed using an inch diameter pvc pipe using 20 gauge insulated hookup wire, L1 require 6 turns and L2 require 14 turns. You can add turns to or subtract turns from L(or change C2) to receive other frequencies. Q2 and Q3 form an amplifier,....
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The basic small-range remote controls are 2, Infrared and RF (Radio Frequency). One of the weaks of Infrared is that the signal can not pass the walls. So, if you wantto control your garage door, the only way is to use some RF remote control. The circuit....
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This inverter circuit works with a transistor and transformer and other components to increase the voltage becomes high. Input supply voltage ranging from 3V to 6V DC, later it was raised to high voltage AC. However, in this inverter circuit output current....
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Simple 0-5 digital voltmeter using 8051 (AT89S51 microcontroller) with circuit diagram and assembly language ASM code. Simple digital voltmeter....
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C4, L form a resonator: resonant frequency is the FM transmitting power of the microphone, according to the parameters of the diagram component transmission frequency can be between 88 ~ 108MHZ, just FM radio receiver covering the frequency by adjusting the....
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Installing LED strips in car`s tail lamps to convert it from conventional bulbs to LEDs. This is the product I`m planning on working with and I need a length of 16", 15" and 14" to make then look correct in my housings. When I did the math the 19. 7" strips....
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Grid driven tetrodes like 6146, 807, or 4CX250`s have high power gain. High gain systems require very little feedback to become unstable, so they are generally neutralized. The also often require some form of grid loading resistor to reduce or stabilize....
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The following diagram is the 50W offline switching power supply circuit design. The circuit powered by a MOSFET. BUZ80A/IXTP4N8 for 220V AC voltage input and GE IRF823 for 110V AC input voltage. The output will be 5VDC with electric current up to 10A. The....
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The mic inputs are amplified about 100 times or 40dB, the total gain of the mixer including the summing amplifier is 46dB. The mic input is designed for microphones with outputs of about 2mV RMS at 1 meter. Most dynamic microphones meet this standard. The....
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It`s entirely logical that low-cost miniature microcontrollers have fewer legs` than their bigger brothers and sisters some-times too few. The author has given some consideration to how to economise on pins, making them do the work of several. It occurred....
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The very first form of radio communication was radio telegraphy, as opposed to wired telegraphy. The telegraph key turns the transmitter on when it is closed and off when open. The operator taps out the message in a long and short, dashes and dots, code and....
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This circuit can be used to delay other appliances connected to the output of the relay. After working set To prevent equipment damage from...
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A model boat that can sail autonomously along a course planned in advance. This explains the meaning of "Roboat" that is the short form for "robot boat". The core is the controller M68HC908GP20 (the quad flat plastic pack version) that stores the coordinates....
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The circuit is light seeking; it will follow a flashlight around a darkened room. A pair of photocells determine the direction in which the robot will move. Each photocell is connected to an op amp configured as a comparator. When sufficient light falls on....
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The aim of developing this project is to control the speed of DC motor. The main advantage in using a DC motor is that the Speed-Torque relationship can be varied to almost any useful form. To achieve the speed control an electronic technique called Pulse....
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The output frequency alternates between about 2100 Hz and 2200 Hz. This is a very distinctive test signal that is easily distinguished from any other signals that may be present. ..
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This is the Tesla Coil circuit diagram with the detailed explanation of its working principles. The electronic circuit simulator helps you to design the Tesla Coil circuit and to simulate it online for better understanding..
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In designing logic circuit, it is sometimes necessary to compare values of two digital data. In this case, creating your own magnitude comparator can cause you more logic IC and can consume more time and money. This magnitude comparator IC might help you. It....
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It is a little collection of amplifiers in bridge connection. The output power is low and they are for general use. They can be used with small active loudspeakers, car stereos etc. The only restriction, is that we should use loudspeakers with resistance....
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This interface design comes a long way. This is in fact the first microcontroller design I`ve ever started. Somehow it kept going with me during past few years. I probably drew the first lines of the schematics diagram of the first prototype in early 1998.....
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This alarm system has 6 independent zones, 1 timed entry/exit zone, a 7 segment LED display and a test or walkthrough facility. Suitable for a small office or home environment, it can also be adapted to use a combination lock or keypad to set and reset the....
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The digital time clock is circuit that electronic amateurs are most interested. And The clock ICs that most popular are LM8361, MM5387, Unfortunately these ICs....
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When the push button is pressed, a clock pulse appears on the CLK input of flip-flop IC1b. The output then toggles and the LEDs turn off. At the same time IC1a is reset, which silences the buzzer. If you press the button again, the LEDs will turn on since....
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Hey all I`ve got a paper this year in (active) electronics. I`m in the second year of a bachelor in audio production. Our main project will be to....
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A radio controlled electronic flash is a useful item in any photographer`s kit. Professionals use them all the time. For example, a wedding photographer would put one behind the bride to back-light her gown and veil. You don`t want wires showing in a shot....
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This instruction shows how to convert a standard microscope with light bulb to LED light. Only a cheap mobile phone charge can be used as the power supply because of the much lower power consumption of the LED light. Defective original power supplies do not....
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The heart of the circuit is the two transistor flasher with frequency modulation applied to the base of the first transistor. When the pushbutton is depressed, the frequency of oscillation climbs to a peak and when the button is released, the frequency....The controlling range of wireless doorbell is 100M. Transmitter:- This transmitter section is designed around oscillator transistor (BF194B) T2 followed by two transistor (BC148) T1 and T3. Transistor T2 generate special radio frequency determined by trimmer....The mid to late 1930s reflected a curious mixture of old and new thinking in aircraft radios, led by brilliant engineers in such companies as Aircraft Radio Corporation and RCA. The example below should endear itself to every radio amateur growing up in the....Radio-frequency schematics (also see. ne602 datasheet and application note,.This page contain electronic circuits about Electronic RF receivers Circuits. This index has a wide collection of RF receivers, that can be....Ralph Stirling, KC3F, and I built the first generation using a Texas Instruments C5X DSK digital signal processing starter kit. Let it suffice to say that the second generation is a tremendous improvement over the first, because it uses a much more suitable....The original scale on my voltmeter was from 0 to 30volts. I made a new scale by removing the old scale from the meter and scanning it into a paint package on my PC. I deleted the old numbers but left the scale in tact. I then just added my new numbers on the....The following is a copy of an article posted by Wilf Rigter to the original BEAM email list and as such represent an important historical and technical reference The NuStepper is a circuit designed by Wilf Rigter, using a 74AC86 quad X-OR chip to make four....This indicates like LM3914 in dot-mode. It is a drawing i made made to troubleshoot a gadget, around two decades ago. Strangely it had a echo of a design i had made into a 7107 dpm years before that. Now i am scanning all my drawing and notes, useful or not.....I built the Electric Scooter,E-Bike PWM speed controller circuit. I can not get the oscillator to work. I checked the pc bd and is ok All resistors....The main part of this doorbell circuit are two NE555 timer ICs. When some one presses switch S1 momentarily, the loud speaker sounds a bell tone as long as the time period of the monostable multivibrator built around IC1. When the switch S1 pressed, IC1 is....This is a simple 12v power supply circuit diagram. It has a fixed voltage output and it based on LM7812 voltage regulator IC....A simple usb LED lamp circuit using 5 volts power supply from usb port, which can be used to light a desktop or laptop computer during power failure....Atmega 128 is like other AVR microcontrollers. They are ISP is in-system programmable. Earlier I wrote an article about AVR ISP programmer where 74HC244 buffer is used. Using buffer is safer for your AVR. But what if you need 128 atmega programmer without....System Oscillator Crystal/Ceramic Oscillator. The following circuit combination of resistors, capacitors and inductors depicts an equivalent cir- cuit for a crystal or ceramic Oscillator ..This homemade metal detector circuit will help you find objects composed of materials with relatively high magnetic permeability. It is not suitable for buried coins discovery that is not sensitive enough but you can detect pirates treasures! The metal....The American Electrician gives a description of one wherein a glass battery jar, six inches by eight inches, is wound with 60 to 80 turns of American wire gauge No. 18 B & S magnet wire. Into this is slipped a primary consisting of eight to ten turns of AWG....This design came about as a result of efforts to design a high stability reference which locked to a 10MHz source. With some minor hardware adaptation and completely new firmware, it proved possible to design an excellent GPS Disciplined Oscillator (GPSDO)....First, I would like to say hello to all of you, I am new to this site, so take it ""easy"" on me I was referred here to expose about my....The HT6337 is designed as one kind of infrared remote control receiving decoder circuit that can be used in the electric fan application. It uses the 28-pin dual-row DIP package, the matching model is HT12C. The HT6337 is one of the series products. The....