Top Circuits Page 128
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A detailed DIY remote controlled AC Fan regulator with 10 stage speed control. Made with ATmega8, full source code and PCB Layout....
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Many application requires large number of keys connected to a computing system. Example includes a PC keyboard, Cell Phone keypad and Calculators. If we connect a single key to MCU, we just connect it directly to i/o line. But we cannot connect, say 10 or....
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This article discuss how you can detect the entry of a person in a room and get this signal inside your MCU. This is NOT a complete project but just an idea that can be implemented in many different projects. The technique is to use use an IR transmitter and....
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An EEPROM is kinds of novalatile memory, that means it is used for storing digital data permanently without any power suply. EEPROM stands for Electrically Erasable Programmable Read Only Memory. The advantage of these kind of ROMs is that they can be erased....
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RFID is a great technology, has may uses and become very cheap and easy to implement these days. This tutorial describes how to interface a RFID Reader with a common Atmel AVR MCU....
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Detecting colour of an object can be an interesting and useful electronic application. It can be realized using a colour sensor like TCS3200 and a general purpose microcontroller like AVR ATmega32. TCS3200 chip is designed to detect the colour of light....
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A small project that will make you expert in using these displays in your own projects. We will make a system that can display any number between 0-9999 using four of these displays. We will design a function Print() that we can use on latter projects to....
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This article is for complete beginners with servo motors. It teaches you the servo motor basic theory and gives detailed steps to use them with AVR Microcontrollers like ATmega32....
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In present day, variety good sensors are available to measure almost anything. In this tutorial will explore the wonderful world of sensors, starting with a very simple analog temperature sensor LM35. We will learn how to interface it with PIC MCU and....
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A very useful expansion board for our PIC development board. It will be a Do It Your self (DIY) LCD Expansion board. The expansion board can be plugged into the PIC development board to add 16x2 Alphanumeric LCD Support to it. Since LCDs are required in many....
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We will use them to show current room temperature using a LM35 temperature sensor. Please note that this schematic is slightly different from our previous schematic on multiplexed seven segment display. The display select i/o pins were RA0, RA1, RA2, RA3 on....
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A line follower robot, or a LFR in short, is a simple autonomous robot that optically tracks a line made on the surface of the floor. That means you have an arbitrary line drawn on the floor and the robot tracks it by moving right along it! The line is....
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On the 10 MHz fundamental I only measure the HP8562E PN flloor meaning that the TCXO phase noise is better than the spectrum analyzer noise floor. I`ve measured some harmonics from 20 MHz to 1 GHz. There are still measurable harmonics up to 2-3 GHz. 2. TCXO....
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Zender diode to do the over-voltage protection, this issue might be solved. Am I right or I need to do another thing to protect it. Please give me any advice. A zener diode will help if over-voltage on VDDA if that is the cause of the failure, but with a 12V....
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The ADAU1701 datasheet recommends on p18 that MP11 be used to derive MCLK. Now MP11 also serves the purpose of OUTPUT_BCLK when used for I2S. Therefore does this mean that I can connect MCLK and BCLK together 2. The ADAU1701 operates at 3V3 and AD1955 at 5V.....
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Using AD9284 with the interface of adl5380 demodulator. I tried to work in default mode of AD9284. I have checked I and Q outputs of demodulator and everything was fine there. When i checked digital outputs of AD9284, I could not see the desired output. So,....
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The DDC lines on HDMI connector side are 47KOhms 5V PU and 2KOhms 3. 3V PU on FPGA side. Our schematic look like this one: This glitch is part of the normal operation of the DDC buffer in the AD8195. The glitch only occurs on the rising edge of the....
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The serial interface is working fine (Read the ID register correctly) but for some reason the on-chip current sources doesn`t seem to work. I have connected 470E resistor on IOUT1 and have configured the IO register (Value 0x03) so that 1mA is sourced on....
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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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Because it is the 12 bits, the highest rank counter is divided to 1/4096. Because it is, in the highest rank, the signal of 4KHz can be seen in the about 500-millisecond blink. A 7 segment display is manufactured encapsulating 7 LEDs inside a single case.....
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This is very stable, harmonic free, long range fm transmitter circuit which can be used for fm frequencies between 88 and 108 MHz. This can cover 5km range (long distance). It has a very stable oscillator because you use LM7809 stabilizer which is a 9V....
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High voltage resistors for HV divider are SFERNICE or PHILIPS type VR37 (3. 5 kV - 0. 4 W). They are NOT expansive (even if they are sold by 25 or 50 units) and it is always useful to have some in junkbox if you want to make high voltage divider for other....
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The particular interest of the ADL5519 is focused on bandwidth which is specified up to 8GHz (but still usable in 10GHz with reduced dynamic). With two channels, it is possible to measure the power transmitted to the antenna and the reflected wave, to....
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Following the same idea as the Chipstein and Cornell designs, the circuit uses an instrumentation amplifier (the AD620) to take the voltage difference between two spots on the body. A second amplifier (the CA3140) amplifies this differential signal. A....
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This weekG•s plan is to build a device that warns of the potential of a knockdown the process by which an over-canvassed ship is lain over on her beam-ends. The potential for sinking at this point is high, so it is an event to be avoided. As the reading of....
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The Arduino microcontroller board is able to supply a current of 40mA from its output connections. These digital outputs are fixed at 5V ON or 0V OFF . This is adequate for working with LEDs but devices such as motors, solenoids, high brightness LEDs etc.....
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The power transformer has three secondaries: 720V at 120mA center-tapped for the plate and screen supplies, 6. 3V at 3. 5A for the tube filament and bias power supply, and 5V at 3A (not used). Since the 5V secondary is not used, a little more current than....
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In a grid driven amplifier it is necessary to match the low impedance of the driving transmitter (typically 50 ohms) to the high impedance input of the tube (typically several thousand to several million ohms). The signal from the input jack travels via....
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The input coupling capacitor allows the input signal to pass through to the grid of the tube while preventing the input source from potentially shorting the grid bias to ground. If the grid bias were shorted out, the 6AG7 would overheat and it would be....
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The operation of the 6CL6 transmitter is actually quite sophisticated, despite the simple appearance of the circuit. The heart of the circuit is the electron-coupled crystal oscillator shown above. This circuit combines the functions of oscillator and....
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The antenna coupling capacitor is a critical component in a regenerative receiver without an RF stage, like the Twinplex. In such a receiver, the antenna is an integral part of the regenerative detector, and for proper operation the coupling to the antenna....
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The input impedance of a grounded grid amplifier is typically several hundred ohms. Though most vacuum tube transmitters will have no trouble driving such an impedance, solid state transmitters, which are designed to drive loads that are very close to 50....
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Externally, the chassis looks identical to the 22BD. Exception: the 22BD has the jack for the speaker connection - two female sockets - on the right (antenna) side of the chassis; the 3BTD has a 3" harness (Black and Green wires) exiting the left side (same....
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Install your fresh mod board into your FDS drive mechanism. You need to cut two traces and solder 8 wires to various points on the board. If you have installed a console modchip before, this step should be a piece of cake. Since the Famicom uses 1980s....
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If you have an application in which a MOSFET is already used to switch a load, it is relatively easy to add short-circuit or overload protection. Here we make use of the internal resistance RDS(ON), which produces a voltage drop that depends on the amount of....
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This small circuit transmitter processes the signs of audio of a table or microphone, and the signs of video of a camera, or still the audio signs and video of a DVD, Video-cassette or even it sweats her video plate has an exit of composed video, you can....
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This is a circuit that is known as wien bridge oscillator circuit. The circuit has positive and negative feedback loop. This circuit is work with control by op amp. This is the figure of the circuit. The circuit oscillates at a frequency determined by the RC....
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In this article, I`ll show you how to build a coil gun. A coil gun is a device that fires magnetic projectiles at high velocities, using electricity. Coil guns require no explosive propellant, therefor can be fired an infinite amount of time, providing that....
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Making Electromagnetic Weapons series. For the Electromagnetic Pulse Generator, check out the last three articles (One, Two and Three). I`m sure almost all of you have used a microwave at some point in your lives. As a child, I always found microwaves....
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In this article, I`ll be showing you how to make a simple yet effective static electricity generator. Basically, this device allows you to carry a constant static charge on your body and discharge it on anything grounded or of opposite polarity. The....
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In this article, I`ll show you how to create a simple yet effective way of scaring off intruders. Of course, there are methods around this approach, but it`s great for office pranks and general fun. The project requires a little background knowledge in....
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This page provided to the domain owner free by Sedo`s Domain Parking. Disclaimer: Domain owner and Sedo maintain no relationship with third party advertisers. Reference to any specific service or trade mark is not controlled by Sedo or domain owner and does....
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This page provided to the domain owner free by Sedo`s Domain Parking. Disclaimer: Domain owner and Sedo maintain no relationship with third party advertisers. Reference to any specific service or trade mark is not controlled by Sedo or domain owner and does....
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This is a circuit diagram for logic probe that is based on single CMOS IC. This logic probe shows three logic condition, High, Low, and Pulsing. Ind addition, there is no LED`s will glow if the probe input is neither hi or lo (the high impedance state of....
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This experiment has two main objectives. First, we will become familiar with the characteristics of the Geiger-MG ller (GM) tube, including the properties of threshold, starting and operating voltages, GM plateau region and plateau slope. Then we will use....
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The Fender Bassmanis a legendary guitar amp known to both guitar and bass players. It wasintroduced in 1951, primarilytargeted for bass guitar players andpromoted asa bass ampfor the Fender Precision Bass guitar, the first mass-produced electric bass guitar....
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The AB763 Super Reverb is a very popularFender ampdue to the huge tone, robustness and the pure tone from the traditional blackface AB763 amp design. The AB763 design is alsoto be foundin some silverface amps between 1967 and 1969. The later silverface....
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The transformer is a 600:600 ohms transformer (also named 1:1 ratio 600 ohm transformer) : more or less the same number of turns on both primary and secondary coils, and optimized to work at 600 ohms load. Selectronic sells one here. I measured the primary....
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This page documents instructions for use of the Innovatia Renesas M3850A microcontroller programmer. The following design uses a DB-25 type parallel-port cable, and requires MS-DOS 6. 22 or earlier. This is because Microsoft Windows restricts access to the....
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This is a design circuit for amplifier was designed in order to fill the gap in the 3-10 Watts power output range of the audio amplifiers available on RED Free Circuit Designs. Therefore a simple, very low parts-count amplifier, was designed on the same....
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This is a one module of diesel and horn train circuit. This circuit is work with built by 555 timers IC, and some op amp. This circuit is a complete system for the horn circuit. This is the figure of the circuit. The main power supply to the system must be a....
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Enter values for R1, R2, and C and press the calculate button to solve for positive time interval (T1) and negative time interval (T2). For example, a 10K resistor (R1) and 100K (R2) and 0. 1 uF capacitor will produce output time intervals of 7. 62 mS....
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The drawing below illustrates a multistage light sequencer using descrete parts and no integrated circuits. The idea is not new and I hear a similar circuit was developed about 40 years ago using germanium transistors. The idea is to connect the lights so....
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Hall Effect sensor will produce a voltage proportional to the magnetic field strength received by a Hall effect sensor tersebut. Sensor it only consists of a silicon layer and two electrodes on each side of the silicon. By the time without any influence of....
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LA4440 is a dual channel audio amplifier IC. It can be used in two modes one is Stereo amplifier and another Bridge amplifier mode. The LA4440 is a monolithic linear IC from Sanyo. Here I give the both circuit mode of amplifier using IC LA4440. C10 is filter....
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The Amplifier circuit can be made with an IC power amplifier LM1875. IC LM1875 is a single chip power amplifier from National. 20 watts audio amplifier with LM1875 is a low power amplifier with good quality to the room. To assemble the amplifier 20 watts....
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This circuit would be mounted in a small plastic or preferably metal box, with a 9V battery, level control, a male XLR connector (same as on a microphone) and a switch. Current drain is low, since the circuit only uses one dual op amp. There is no need for a....
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This little circuit can assist you to get rid of all surplus tiny ac mains adaptors from your desktop. The circuit is nothing, however a sensible dc power box directly powered by the smps of your desktop pc. Regulated, clean and guarded +12VDC is offered at....
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This approach can be demonstrated using the rather unusual semiconductor power flip-flop described here. A flip-flop is a toggling circuit with two stable switching states (bistable multivibrator). It maintains its output state even in the absence of an....
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This is simple intercom circuit. Here I have used common Ic LM380. Now the switch is in the talk position for the speaker on the left, And the other persons position is listening position. If other one wants to speak The switch must be change to another....
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This is a class AB transistor power amplifier. It is a simple amplifier to build, uses standard parts and is stable and reliable. The entire circuit utilizes commonly available components and may be simply built over a general-purpose board. But this....
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The schematic for this charger is pretty simple. GellCell Battery Charger: circuit to charge a Gell Cell or other lead-acid type. This simple battery level monitor circuit can indicate the charging process in 12 Volt Lead Acid battery or Tubular. 12V battery....
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The circuit is basically a radio frequency (RF) oscillator that operates around 100 MHz. Audio picked up and amplified by the electret microphone is fed into the audio amplifier stage built around the first transistor. Output from the collector is fed into....
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On many cars, the boot light will not go out until the lid is properly closed. It is all too easy when unloading the car, to leave the lid ajar. If you are unlucky and the car remains unused for some time, the next time you try to start it, the lamp will....
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An impressive little machine gun sound effect generator circuit is discussed here. Once built can be integrated with any audio amplifier to experience a roaring bullet studded war like simulation. A small hobby project which can be tried by all electronic....
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1993 VW Passat Engine Control Module, Automatic Control Unit, and Automatic Solenoid Electrical Wiring Diagram are shown in the following figure. It shows the connection and wiring between each parts and component of Engine Control Module, Automatic Control....
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No fire replaced ignitor still no fire checked for voltage to valve assy none checked safety switches on fire box & vent normally closed condition okayhow do I check the centrifical switch & pressure switch for proper operation....
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The following project can either stand alone as a plug-in peripheral, or be integrated as part of the TRS-80 keyboard unit. In either case, the specifications are: The hardware involved in this project, including power supply and miscellaneous hardware, will....
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Automated frog call data loggers have been used successfully to provide information on: (1) species presence at the time of sampling (that is, species likely to be overlooked during time-constraint sampling can be recorded with greater reliability); (2) life....
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About a year ago I threw a magnetic swipe card reader into a larger Digikey order. I didn`t have any specific plans for it at the time; mostly I was just curious to learn about swipe cards and what kind of hidden information I was carrying around in my....
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Catalyst Semiconductor, Inc. (NASDAQ:CATS)a supplier of analog, mixed-signal and non-volatile memory semiconductors, announced it has received a patent for a unique step-down switching regulator circuit architecture applicable to step-down regulators for....
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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....
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A cure that we are testing is to prevent the over voltage getting to the irreplaceable IC U5 - A1752CF after either the switch drives or returns are hit with either a static electric shock or the 24VDC solenoid bus. The protection is simple, there needs to....
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The Nixies I`m using have 10 cathodes (shaped like numerals) and a screen-like anode. These are old Russian IN-12A`s that I obtained from an excellent Ukrainian shop on eBay. Other Nixies might have more cathodes for a decimal point or other symbols (like....
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Covering FM radio reception frequency, by adjusting the L value (La stretch or compression coil L) can easily change the transmission frequency to avoid the FM radio. Transmit signal coupled to the antenna through C4 to launch out...
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This is a circuit about PLL system that can be used to implement an FM demodulator. Since the VCO output tracks the FM signal, and the VCO input voltage is proportional to the VCO output frequency, then the VCO input will be equal to the demodulated signal.....
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Here the simple traffic light controller which is could be used to educate kids rudiments of traffic light guidelines. The circuit utilizes easily available electronic parts. It generally consists of rectifier diodes (1N4001), a 5V regulator 7805, two timers....
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The most outrageous option would be to provide power via a battery pack. A more likely source would be the car`s battery. However, since the circuit`s goal is to sound the buzzer when the headlights are on, we might as well take the power from the....
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FM amplifier is used for amplify signal from exciter in broadcast radio station. In this page, RF FM Amplifier uses solid state material with minimum gain 9dB. Input of the FM Amplifier needs 5-10 watt with power output about 100 watt. Whether you want to....
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The transmitter is built on a Printed Circuit Board. This board uses track inductor for L1, L2 and part of L3. The section built around Q1 is the oscillator section. Oscillation frequency is determined by L1, C4 & C5 which forms the tank. Actually C5 is the....
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Two aluminum rods, each of length "L" in meters are joined together through an insulator as shown in fig. From center, 75 ohm cable is feeded just like ordinary TV antenna...