New Circuits Page 120
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The Spartan-3an board has eight slide switches, indicated as in Figure. Push button inputs are normally low and driven high only when the push button is pressed. Push Buttons are interfaced with FPGA I/O lines...
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I needed an excuse to use the soldering iron so I figured that I might as well as make a frequency counter which is something that I`ve always wanted, but lacked in my lab. Here`s the schematic. I drew it up in OrCAD PSpice a while back. Since then, I have....
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Some cheap car alarms do not have a connection for the central locking system. However, in most it should be possible to find a point in the alarm circuit which is high when the alarm is activated and low when it is off. This signal can then be used to drive....
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The key point is that there is no iteration as is usually done. All alignment methods I have seen rely on measuring, tweaking, measuring, tweaking, etc. There are many problems with this: for the DIYer it means expensive tools or settling the suspension....
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Here`s a circuit to create a buzzcoil using a standard automotive ignition coil. A 556 dual timer is used to establish the frequency and duty cycle of the coil current. One of the timers is used as an oscillator to generate the 200 Hz rectangular waveform....
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A medium current switch mode power converter, designed for powering of superconducting loads requiring positive or negative current and positive or negative voltage control (4 quadrants). Constructed from a modular architecture composed of 2x [+/-400A +10V]....
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When the input goes from low to high, a narrow positive pulse is generated at point A. This pulse becomes - 13 V at point B, which cuts off D2. ICC`s V+ voltage becomes zero. The charge on C1 will be absorbed by ICC on in a short time. The time constant of....
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Simple frequency meter or frequency counter circuit with LCD display and Avr micro controller.DIY schematic circuit diagram & embedded c code....
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In this one, servo is programmed to be controlled by two buttons, one turns servo to the left and the other one turns it to the right. When the servo is turning, corresponding LED will be switched on to indicate the operation. Because Arduino has built-in....
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Audio metering is present in almost any equipment that plays or records audio from cell phones displaying bar graphs of audio output levels, to home stereos with flashing LEDS, to live broadcasting. There are multiple standards for audio metering that deal....
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Wall sockets supply power in the form of a 230 volt sine wave. The frequency of this sine wave is supposed to be 50 hertz. In other words, the voltage on the socket alternates between positive and negative at a rate of 50 full periods per second. (At least....
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This application note presents the component values and measured performance for the MAX2681 mixer IC when tuned for GPS operation at 1575MHz....
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The medical ultrasonic atomizer circuit is composed of power supply circuit, atomization amount liquid level detection control circuit, ultrasonic oscillator and fan motor M, it is shown in the figure 9-111. The power supply circuit is made of timer Q, fuses....
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Here the long range/distance Infrared transmitter circuit, give you extra power for your Infrared transmitter. The majority of the IR remotes do the job reliably within a range of 5 metres. The circuit complexity increases in case you desig....
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A Super-Duper Powerful Vacuum Tube QRP amplifier for my 800mW QRPP homebrew telegraph vacuum tube transceiver "3T" (I promise to write a separate article or two about this three tube transceiver project later). It was not an easy decision to me because for....
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AUDIO AMP + 3KHz FILTER. This circuit is the audio amp section for a complete optical transmitter. The increased circuit and filters the voice audio signals from an electret microphone..
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This color changer mixes light from high-power LEDs to create more than 16 million colors. A smooth auto-fader cycles the colors, or you can hook it up to a USB port and control it from your computer. This color changer borrows a well-known color model used....
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Describes how to layout switch-mode DC-DC converter printed circuit boards (PCBs) to minimize switching noise and EMI....
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At times it`s really very annoying to see the street lights kept switched ON even during broad day light. The present circuit of an automatic night light can very effectively put an end to this problem. Read here how to build it. We all know how important it....
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This setup allows you to allocate the pins of an mbed for a specified interface without having to recompile the code. It uses a PS/2 Keyboard as an input device and an LCD as an output device. It can take commands and interpret them according to predefined....
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Sawtooth wave oscillator? circuit can be implemented using several methods, here we present one design that employs 555 IC.? Here is the schematic diagram of...
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The success or failure of your lighting upgrade efforts rides on the quality of your parts and the quality of your work. It matters how carefully you route wires to avoid chafing insulation. It matters how well you solder connections (crimps and sloppy or....
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I have 6 injectors from a Suzuki bike with unknown flow rates. Can I flow them myself to see what I have?....
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This FM transmitter circuit uses four radio abundance stages: a VHF oscillator congenital about transistor BF494 (T1), a preamplifier congenital about transistor BF200 (T2), a disciplinarian congenital about transistor 2N2219 (T3) and a ability amplifier....
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I have 1968 Ford and the motor identification is now a 1972 engine. Alternator was gone and I have a new one. Was told that I need to reverse the polarity of voltage regulator to make alternator start charging. A diagram of wiring to both voltage regulator....
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The above picture is audio logic level probe circuit, which is composed of voltage comparator, multivibrator, and piezoelectric ceramics HTD etc. The latter two constitute audio circuit and the audio frequency is used to assess the TTL or COMOS instrument s....
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This is a circuit of Closed-Loop Automatic Power Control for RF Applications. The circuit uses a log detector (AD8318) and a VGA (ADL5330). This circuit has a...
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The 555 Stepper Pulse Generator kit will help you with the pulse required to drive your favorite DC Servo Motor application..
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Despite the need for an IC, this ubiquitous interface between the modulator and audio-video signals has not been reduced to an integrated circuit. The major reasons for that deficiency are the difficulty of such a design, the variations required for....
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Linear electronic oscillator circuits, which generate a sinusoidal output signal, are composed of an amplifier and a frequency selective element,a filter. An oscillator circuit which uses an RC network, a combination of resistors and capacitors, for its....
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The avr-gcc/binutils combination is able to provide Intel Hex files, suitable for upload to an AVR uC using sp12. More about that in the Linux section below. If you will be using assembly, then the next thing you want is an assembler, to convert your....
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This simple code lock circuit described here is of an electronic combination lock for daily use. It responds only to the roght sequence of four digits that are keyed in remotely. If a wrong key is touched, it resets the lock. The lock code can be set by....
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Graphic equalisers are made of 15 or 30 band-pass filters, one for each 1/3 octave frequency. Conventional equaliser designs use standard discrete components to realise these band-pass filters. Apex GX- and PE- series achieved far better results by using....
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For simple electronic circuits, it may be sufficient to get a qualitative insight on dedicated electrical signals. This interface circuitry allows to use the line-in input of a standard PC soundcard to be used as a 2-channel oscilloscope. This setup does not....
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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 aro....
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The Liquid Crystal Library allows you to control LCD displays that are compatible with the Hitachi HD44780 driver. There are many of them out there, and you can usually tell them by the 16-pin interface. Before wiring the LCD screen to your Arduino we....
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The circuit was designed to illustrate the use of tone control circuit by which the audio signals are adjusted before being carried out to any output devi....
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In the "DSP" tab`s "Local Oscillator" section, click on the button marked "Single Band" and type in the desired center frequency (7046000). This sets Rocky`s center frequency at 7. 046 MHz. Set up your transceiver (or other signal source) to transmit a low....
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This page describes building a IR remote shuttle release for the Nikon D70s digital camera (compatible with the Nikon D70 and possibly others). The equivalent commercial product is the Nikon ML-L3 remote control. It can be used to trigger the shutter for....
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Hard water has a high concentration of minerals, and of these calcium salts are the most troublesome. But there is a solution coming in form of a cheap diy....
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The transistor shown is a P-channel MOSFET acting as a "high-side switch". More commonly, an N-channel MOSFET low-side switch is used, but what you have will work as long once you add something to the drain such as in this image of P-Channel MOSFET switch....
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Our project demo is also successfully finished and the only thing left to do for this project is the final project report which is due June 15 since we are integrating that report with a conference paper. This is the last update I`ll be making to our....
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This simple circuit can be used to activate whatever you like, for example, by connecting it to microcontroller, relays, secret alarms, robot applications or just turn on LED1 which lights up as long as you touch the metal plate. The circuit consists of....
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The KA2284 are a monolithic integrated circuit disigned for 5-dot LED level meter drives with a built-in rectifying a amplifier, it is suitable for AC/DC level meters such as VU meters or signal meters. Disclaimer All files are found using legitimate search....
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Circuit Many companies offer simple alarm devices for personal use in bedrooms or hotel rooms. A metal chain attached to a box holding the electronics is placed around the inside doorknob of a wood door. Anyone grabbing the knob from the outside is detected....
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Hope, you follow my advice and hack your cheap USB speakers, to get nice ( pre-assembled ! ) analog front-end for this project. If not, than get your soldering iron to work, minimum two resistors and 1 cap would required, assuming you already have display....
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TPTG transmitter was transformed into a trendy TNT. You can use your present K-111 power pack for this transmitter as well as for the receiver, and thus save the expense of a separate power supply unit. Build this little transmitter and go "on the air. " The....
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It`s well known that many animals are particularly sensitive to high-frequency sounds that humans can`t hear. Many commercial pest repellers based on this principle are available, most of them operating in the range of 30 to 50 kHz. My aim was, however, to....
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THE CUBE is a 3D jigsaw puzzle, with the added feature that a puzzle piece vibrates for approximately a second when it is placed in the correct place in the puzzle. We accomplished this by building an electrical design such that a circuit delivering power to....
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The A2045 uses the same circuit as the A2052. Instead of mounting with three snap-top standoffs, as does the larger A2052 board, the more compact A2045 mounts by gluing it onto a rectangular flange that fits around the bottom side of the board. When glued....
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This circuit is intended to program AVR controllers such as the AT90S1200 via the parallel port. The circuit is extremely simple. IC1 provides buffering f....
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Hardware implementations of spiking neurons can be extremely useful for a large variety of applications, ranging from high-speed modeling of large-scale neural systems to real-time behaving systems, to bidirectional brain machine interfaces. The specific....
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The thermostat circuit built to control a 1300 watt space heater which are controlled with a small pulse transformer. Component: LM339 IC, ....
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This simple combination lock accommodates codes from 1-9 digits long, with the only restriction being that the same digit cannot be used twice. The circui....
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This is iKHz sine wave generator circuit built based on configuration of inverted Wien bridge (see C1-R3 C2-R4). R5 and R7 used for output amplutide setting. Set R5 to read 1V RMS on an Audio Millivoltmeter connected to the output with R7 ro....
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This circuit used to come as a kit from a surplus supplier, but probably isn`t available anymore. It shows a few novel concepts such as using a 555 as a pulse width modulator (PWM), and series/parallel camera flash transformers. WARNING: This circuit is....
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Telephone ring tone generator circuit, built with only several components. It generates simulated telephone ring tone and requires 4.5V DC to 12V DC voltage..
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This article describes how to build an opto-isolated power switch for controlling heavy loads with logic levels....
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This HD TV UHF wideband amplifier (Ultra High Frequency amplifier ) has a total gain of 10 to 15 dB in the 400 850 MHz domain frequency so it can be used where the tv signal is weak. For this UHF antenna tv amplifier to work correctly you need to cut the....
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Need some program to set it`s channels to the maximum level, or write the full scale to the DAC. Looking at the MD schematics, you`ll see that the audio is mixed together with relations of 0. 0431 for the PSG, 1 for the YM and 0. 0468 for the external audio....
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When you need connect your Microcontroller Project to COM port in PC you need RS 232 converter. There are many chip to solve the problem like MAX232, DS275 etc. But if you need simple and chep for RS 232 converter, i though this circuit will be usefull for....
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Previously I used a linear regulator, now I use Max756 ( ) boost converter. I`m seeing 0. 1 - 0. 3V output ripple in the current. The Max756 datasheet says I should expect about 50 mA ripple. So my power is a little noisier than expected, but my real problem....
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The Infrared emitter detector circuit is very useful if you plan to make a line following robot, or a robot with basic object or obstacle detection. Infrared emitter detector pair sensors are fairly easy to implement, although involved some level of testing....
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The successive approximation Analog to Digital Converter(ADC) is probably the most common ADC. It requires few parts, and is simple to operate. Also, it always takes exactly the same amount of time to calculate the result. In a nutshell, it consists of a....
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Protect your expensive batteries from discharge damage with this mini-sized electronic cutout switch. It uses virtually no power and can be built to suit a wide range of battery voltages....
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You could have an USBI2C with every sensor, which would mean 4-sensors for £120. The SRF02 runs on the I2C bus, which i`ve been told I shouldn`t extend more than ~2metres. The obvious plan would then be to have one USBI2C for the back bumper, and one for the....
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Controls intervals up to 1 h in 1-s increments as programmed by thumb wheel switches S1 and S2. Circuit is basically two-stage programmed counter driven by 1-s clock derived from 60-Hz power line. A1 is connected as divide-by-60 counter triggered by 60-Hz....
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This article is about a simple 5 channel radio remote control circuit based on ICs TX-2B and RX-2B from Silan Semiconductors. TX-2B / RX-2B is a remote encoder decoder pair that can be used for remote control applications. TX-2B / RX-2B has five channels,....
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The handheld mini light beam receiver. On the left is a small solar cell, you can make out the various components on the circuit board through the transparent lid of the box. On the right, top and bottom, are the headphone and crystal earpiece sockets while....
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Current meter used to measure the current from a solar panel. It has very low power loss for currents in the 0-10A range. It also works as a general purpose DC current meter Gate Boost Solar Engine The Gate Boost SE uses a 1381, a 2N7000 MOSFET and a 2N3906....
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One of the simplest method of metal detecting is by beat frequency oscillator. Basically, the circuit consist of two balanced oscillator. One oscillator provides the reference signal, and other oscillator is acting as the detector element. The reference....
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Here is a deluxe version of the simple charge rate limiter, using the same idea but with the ability to charge two packs simultaneously from a single wall charger. For circuit description and parts list, see the simple charger page. Since wall chargers....
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For a few experiments such as solar air heaters, I needed a automatic turning on and off of a fan. Probably the simplest way to do this is with a bimetal snap disc thermal sensor. A bimetal snap disc thermal sensor is basically a switch that closes when a....
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A power supply with frequent energy switching; but the schematic is incomplete. I should add another circuit which controls the voltage polarity converter (Four transistors). The circuit generates high frequency current pulses. @CamilStaps Actually I didn`t....
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All errors in circuit diagrams, documents and layout are corrected. The circuit as shown below is functional and working. Note that Q2 is sensitive and easily destroyed by wrong connection, shorts, over-voltage or too much current. What does that mean If....
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Hello i have a 2002 gmc sierra 4wd 1500 series 4.3l. i just replaced the transmission on it along with the neutral safety switch. The problem i am....
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Video amplifier circuit based IC LM359 which a Dual, high speed, programmable, Current Mode (Norton) amplifier, can be used for general purpose video amplifiers...
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H bridge applications for robots, robotics, and motor control. This post focuses on the low side switch element...
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This FM booster that can be used to listen to programmes from distant FM stations clearly. The circuit comprises a common-emitter tuned RF preamplifier wired around VHF/UHF transistor 2SC2570. (Only C2570 is annotated on the transistor body. ) Input coil L1....
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Cal-(IT)2 is developing several generations of general broad application radio/networking test platforms for wireless research and development. CalRadio I is the first generation. It provides a simple, low-cost platform for 802. 11b development from the MAC....
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Electronic Schematic Circuit Diagrams Manual PDF Download...
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This is a less expensive, and DIY option for a hearing aid. It is not a substitute for a real hearing aid that an audiologist would prescribe. Amplification of all sounds and frequencies, or constant use in loud environments can cause additional hearing....
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The TDA2040 is a monolithic integrated circuit in Pentawatt package, intended for use as an audio class AB amplifier. Typically it provides 22W output power (d = 0. 5%) at Vs = 32V/4. The TDA2040 provides high output current and has very low harmonic and....
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Video signals can be difficult to display on an oscilloscope. Normal trigger circuits in most oscilloscopes have trouble getting a stable trigger from the combined vertical and horizontal sync signals, color burst, and picture signal in a composite video....
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Well, it took some time and a few failed attempt, but here it is. A neat project that lets you control two wheels or tracks from your PC serial port with no wires attached. I have it working at 2400 baud and that is about as fast as I can think. We assume....
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Most cases of infra-red remote control failure can be detected by detecting the absence of the pulsed transmitted infra red light. It`s very rare that the....