Popular Circuits Page 224
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I`ve done some research and found that sender will read 100 ohms when the fuel tank is empty, so a trigger reading of 80 ohms would be ideal....
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This circuit monitors the power-line (ac) voltage. When a power failure occurs, on restoration of power, the circuit a..
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Voice Electric (FC52) is converted to electrical signals. FC52 at cost benefits of high glucose amplifier, can amplify the audio signal. When the clapping sound when, Y the sound signal is converted to electrical signals, and add to the inverting input of....
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220V AC after capacitive G buck regulator VS regulator, rectifier diode VD, capacitor filter to G IC (NE555) provides approximately 3.3V DC operating voltage. lC Schmitt trigger connected as light control. Night room inside light, the photosensitive resistor ..
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Automatic Temperature Controlled Fan control the speed of fan according to change in temperature using temperature transducer AD590 and op-amp LM324 circuit diagram...
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This document provides details on using the ATA6833-DK for BLDC Motor Control applications. The BLDC Motor Control Kit consists of two boards: Basic board with a BLDC Gate Driver SBC (System Basis Chip) ATA6833 ATA6834 and external MOSFETs Controller board....
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As shown in FIG constituted by 915MHz RF2155 power amplifier application circuit. Radio frequency (RF) signal from the input pin 7, after the preamplifier, after the last stage..
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There`re many, who built the Easy Programmer or C-52 Evaluation Board, asking for the RS232C level converter chip, DS275. Many have changed to MAX232 instead, because of not available in his home. Here is another simple and cheap circuit using small signal....
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A CMOS NAND gate or NOR gate can form a single-shot, this single-shot circuit extensively used to delay the pulse signal, stretching and shaping. Monostable door circuit, its m..
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Imagine devices that can disable and destroy microorganisms-viruses, bacteria and fungi - by means of a pulsed, intense, magnetic field! They are not devices for the distant future. They are for today! Already several different pulsed magnetic field....
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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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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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Common to all the devices is that they emit intense red light with a wavelength of 660 nm. Some biophysicists claim that light of this wavelength can have a positive effect on the human body and can initiate healing processes. This so-called phototherapy` is....
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A newer version of this circuit board is available. Rev 4 includes a faster CPU, more memory, more I/O and an optional LCD. We recommend you use Rev 4 for new projects. Even though this older board is no longer available, we are keeping these old pages....
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Electromechanical door chimes can enhance your home, but they are vulnerable to costly repair problems. A defective pushbutton switch or a careless visitor can maintain the chime in an energized state for a prolonged period, thereby damaging the chime. The....
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When I spotted this April, 1955 issue of Popular Electronics magazine at a swap meet, I practically left burning rubber on the floor as I rushed over to grab it. Theremins have always interested me, and I had been seeking this issue for a long time after....
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A robber will not stay anywhere with an ear-piercing sound as he cannot hear if someone is approaching. It`s the best deterrent you can get. The "F" contact on the piezo is "feedback" and is not needed in this circuit...
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This is an image Schematic. No Description available...
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You can use a low-cost PC sound card as an analog-function generator by controlling the PC with the program "SoundArb." [To obtain SoundArb, download di2409setup.exe, a 1.06-Mbyte self-extracting installation program.] The program generates standard....
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Designed the same thing but for the reason of having a higher output voltage swing for the mono part of the signal. I personally don`t believe/understand Meier`s idea as voltages are just relative anyway aren`t they I haven`t read this entire thread but from....
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This THD circuit is somewhat different from the usual types: it can operate at the standard fre-quency of 1000 Hz, but it also is tunable from 970 Hz to 1030 Hz, and has an adjustable Q factor of 0. 3 to over 50. Op-amp UI, a TLC272 CMOS unit, contains the....
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This one transistor audio mixer is used in an amplifier circuit design with base driven transistor and with its emitter being current controlled, most of the driving current flows through the collector away. Using the values in the audio mi....
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Withthe 1.5V battery supply power, The Integrated circuit LM3909 can drive the light emitting diode NSL5027. The 300uF electrolytic capacitor is circumscribed capacitor? which makes the flash speed limit around 1Hz....
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The meter will show volume and tone control balance between left and right stereo amplifiers. For maximum convenience the meter is a zero-center type. Resistors are five percent or better and the diodes a matched pair. Optimum stereo level and phase balance....
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Video-signal amplitude can be measured with this simple circuit, which is basically a modified standard peak detector. The device can verify RGB generated by video RAMDACs. Ul is a high-speed buffer and U2 is a latched comparator. CI is a hold capacitor.....
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TDA2040 is yet another power Lings amplifier. Its operating voltage range is wider than the TDA2030, 2. Room ~ 20V, output power is large, the 16V, 4fl load 18W output power, distortion degree is also greatly reduced. Application circuit is shown..
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This is it. It`s a STEREO LED LEVEL METER. It`s the cheapest and best bar graph display available and best of all, it uses readily available components.
You only need a handful of LEDs, 22 transistors, some resistors, diodes and a set of electros - it....
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Heat sensor circuit can be used to control any device using heat sensor. In this circuit a thermistor and a resistance is connected in series. This arrangement makes a potential divider circuit. Here the thermistor is Negative Temperature Coefficient type.....
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IR remote control for my Nikon DSLR camera. Not that I absolutely need one, surely I don`t need it bad enough to get one for about ‚¬30 or ‚¬40 from e-bay. However it would make a nice little in-between project. Big Mike explains the very easy protocol used....
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After the original radio with guts shown transformed into a block diagram of the machine. Electrical schematic shown in Figure 1-27, which is a typical type of tube Group A sin..
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12V of power, and wanted to power LEDs with a forward voltage of 2V, could I only power 6 of them Would I connect the cathode of one to the anode of the next, creating a kind of serial connection Or is there a way to have each LED be it`s own loop Thank you.....
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This circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the ignition. By adding external relays you can....
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Using this schematic electronic project can be designed a very simple water level indicator electronic circuit that uses a 7-segment display to indicate the water level (low, half and full)in the tank. This water level indicator electronic circuit shows the....
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The differential outputs are balanced and are designed to drive long lengths of coaxial cable, strip line, or twisted pair transmission lines with characteristic impedances of 50 ohms to 500 ohms. Differential transmission is superior to single wire....
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The full wave phase control circuit below was found in a RCA power circuits book from 1969. The load is placed in series with the AC line and the four dio....
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This is anaudioamplifier circuit which use TDA7052 as the main component and other 5 pieces of components to support the main component. The ideal supply voltage of this circuit is about 6-12V and no heatsink required. ..
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This time delay relay circuit is built with IC NE/SE555, produced by Intersil which contains a precision timer. Stability to temperature variations is 0.00....
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The simplest technique for measuring current in an actuator or a motor is to monitor the ground current with a resistive element between the load and the ground. Because the device and its associated electronics share a ground potential, you need to amplify....
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This basic oscillator will detect the Earth magnetic field. The ferrite rod and coil are taken from an old Medium Wave receiver and a small magnet is glued at one end. Tune to a medium wave commercial station until you hear a beat note. Any movement of the....
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This ISP Programmer can be used either for in-system programming or as a stand-alone spi programmer for Atmel ISP programmable devices. The programming interface is compatible to STK200 ISP programmer hardware so the users of STK200 can also use the software....
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Box circuit) bistable circuit, each bistable circuit is a single bond by the control output high and low level. When the circuit instant access electricity, electricity through..
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There are monitors which only have three BNC inputs and which use composite synchronization (sync on green`). This circuit has been designed with these types of monitor in mind. As can be seen, the circuit has been kept very simple, but it still gives a....
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This Super Light Sensor responds to minute fluctuations in light level, auto-adjusting over the range from about 200 lux up to 60, 000 lux (ie, from a modestly lit room to direct sunlight). It has lots of potential uses eg, detecting a car entering a....
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Rectangular pulse generators, even at high frequencies, are easy to design. However, the design becomes more difficult if you need a signal that contains a precise number of periods with a sinusoidal shape. Although it is easy to produce a good sine wave,....
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Unlike lead acid batteries one good thing about the Li-Ion batteries is that they can be charged at 1C rate initially. It means the charging current may be as high as the rated AH of the battery at the onset. The design presented in this article can be used....
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This circuit was designed to detect when a call is incoming in a cellular phone (even when the calling tone of the device is switched-off) by means of a flashing LED. The device must be placed a few centimeters from the cellular phone, so its sensor coil L1....
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This electronics educational game uses a NAND IC, a Latch IC and a few peripheral components to construct a project that is able to tell who among the four person press the button first ..
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An LM556 dual oscillator/timer, U1, configured as a two-tone oscillator drives U2, a dual 4-watt amplifier. One of the oscillators, pins 1 to 6, contained in U1 produces the upper frequency signal of about 200 Hz, while the second oscillator, pins 8 to 13,....
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A very simple FM CB radio receiver can be designed using this electronic diagram below. This FM CB radio receiver circuit is designed using an TCA440 integrated circuit. The receiver works with a intermediate frequency of 455kHz. Input filter is 27MF ceramic....
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This page features H-Bridge circuits used for controlling direct current motors. Several designs are shown using both CMOS and Bi-Polar power devices. These circuits could be used as the basis for Model Railroad DCC Boosters or PWM motor controllers. The....
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VD1, VD2, C1 and C2 form a simple half-wave rectifier capacitor step-down voltage regulator circuit, the output of about 12V in straight right current voltage supply manifold LM386 electricity...
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18-year-old electrical engineer student, Chris Rieger, has been working on his levitating light bulb project ” fittingly referred to as the LevLight Project ” for about six months now. Recently he posted images and a video of the project, both of which....
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Circuit used in Dietz siren-light police-car system gives distinctive tones. Position t of S1 produces slow continuous rise and fall. Position 3 produces fast rising and falling tone. Position 2 rises slowly to full pitch when point 1 is grounded, then....
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A touch switch for a USB powered desk lamp, and the touch switch isn`t working. The circuit diagram, layout and pictures are below. I used the circuits from the following two websites to design the circuit: the 4th circuit. I`ve joined the output of the....
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A 1991 350SDL that has the center vent not blowing air issue. However, When I get on it and the revs go high, air does move from the defrost vents to the center vents. Does that mean that the actuators are ok and I have a leak somewhere else or does that....
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This universal triac controller circuit with optocoupler solves the problem that triacs have when functioning at low temperatures (triac needs higher gate...
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MRFICl505R2 is a 1. 575GHz GPS downconverter chip. It integrates mixer, VCO, PLL, crystal oscillator, A / D converter and loop filter and other circuits. MRFICl505R2 IF output frequency is 4. 1MHz; it has 105dB typical conversion gain, 2. 7V operating....
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This is my personal website and here you`ll find some of the projects I develop on my spare time, many of them related to electronics and/or Linux. This website is one of these projects. There`s also a section with pictures of places I visited and a....
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Circuit This Circuit converts a voltage control output from a Process Controller to be converted into a Current Control if the AC-Drive or Valve needs a Current Control Signal. This is a three wire voltage to current loop converter. The 1-5 V DC is....
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This Audio Mixer mixes multiple audio inputs to a single audio output, with knobs to control the volume of each channel. My particular build features....
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The first pulse motor that is used to diss it because it is the positioning control things, we decided to incorporate features that may be needed for positioning control. This does not mean that intelligent, and autonomous driving the motor in response to....
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The edcor that seems to make more sense would be the GXPP15-8-8K EDCOR Electronics Corporation. GXPP15-8-8K You are right, Jeff, the little price....
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Using technology developed by Dr. Royal Rife, Gary Wade has invented an ultrasound scanning rife device that kills harmful microbes and pathogens with multiple frequencies. Many articles on this site tell how....
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A micro power solar engine has been a goal since my introduction to BEAM Robotics. I believe that if there wasn`t one before, I there is one now. What I`m presenting to you looks very similar to one of the circuits found in Steven Bolt`s web pages. As you....
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Wilf Rigter simplified this circuit a bit, made it phototropic, and doubled it up to yield a photopopper design in a post later the same day. I`ve got this design written up elsewhere in the library...
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As shown in FIG hypnosis massage is pocket-sized electronic timing circuit with two 555 timers to form, to meet the health needs of people to relax. Circuit consists of three p..
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Closed lights switch S, 220V AC via RP1, RP2 R and the capacitor C2 is charged when the voltage across C2 reaches diac breakover voltage of VD, VD and triac vs sequentially tur..
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Trigger programming with its build-in pushbutton. The solution I came up with was to add a tiny USB keyboard circuit to the pen`s interface. One method to have the pushbutton trigger a programming command would have been to add a microchip to the pen`s....
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At some time, you`ve probably run into this magical instrument in the lab - the function generator. Just turn the waveform selector knob and a triangle, square or sine wave appears at the output! Turn another knob and the frequency of the signal changes. Now....
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Digital output from a microcontroller is typically a low-amperage signal. For example, when you put a pin HIGH on the microcontroller (in Wiring/Arduino, it`sG‚ digitalWrite(somePin, HIGH); ), the voltage coming from that pin is typically +3. 3V or +5V, and....
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The LM1036 is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car radio, TV and audio systems. An additional control input allows loudness compensation to be simply effected. Four control inputs provide control of....
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The advent of new high-speed technology and the growing computer capacity provided realistic opportunity for new robot controls and realization of new methods of control theory. This technical improvement together with the need for high performance robots....
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Running a bath can end in a minor domestic disaster if you forget to turn off the taps in time. This indicator activ..
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A very simple and efficiency active antenna electronic project can be designed using this electronic schematic circuit that is based on transistors. This active antenna electronic project is useful for a wide range of RF frequencies covering three RF bands....
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The logic power and CAN signals come in from N4 pins 3 through 8. The CAN signals are connected to the MCP2551 CAN physical layer IC, U5. The transmit and receive pins of the microctroller, (U4 pins 5 and 6) are connected to the other side of U5. Lastly, the....
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The circuit below uses two quad voltage comparators (LM339) to illuminate a series of 8 LEDs indicating volume level. Each of the 8 comparators is biased at increasing voltages set by the voltage divider so that the lower right LED comes on first when the....
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The first option is of course a zener. I actually have a bunch of 2. 2V which would protect the capacitor fine. The problem is, of course, half the energy is going to be wasted across the diode short. Is there any way I can regulate the voltage below 2. 3V....
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This example describes use of HS101, HS201 radio transmitter and receiver modules made of radio-controlled rotating color lights, it is essentially a multi-channel radio remote control device codes for a small dance floor or home use. Users stand on any....
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The TV-B-Gone is a tiny infrared remote that can turn off almost any TV. A while ago, I ported the TV-B-Gone software to the Arduino; for details on the port and how it works see my previous post on the Arduino TV-B-Gone. Mitch Altman, the inventor of the....
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As shown for the electrical equipment overload and phase failure protection circuitry. The device consists of + 12V, + 5V DC power supply, AC transformer, voltage comparators, ..
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A "talking" computer is not necessarily expensive - not if you mate one of the low-cost computers (Sinclair ZX-80, ZX-81, or Timex 1000) with Texas Instruments popularly priced "Speak & Spell" learning device. The combination give you several hundred clearly....
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Fortunately, Dodd`s 1909 receiver has survived. It was found among the many parts that were in various boxes that I had purchased at the yard sale. The pieces were identified from the 1909 Station photo. Many of the 1909 Station parts were used in the....
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Fires can occur for several reasons, for example, forgot to turn off equipment that could cause such as irons, fire alarm circuit with a temperature sensor may be one option in an effort to secure our homes from fire hazards. Actually there is also a fire....
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