Popular Circuits Page 205
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The basic requirement was for some sort of output display and some sort of alpha-numeric input. So the simplest solution I could think of was a UART, attached to something with a screen and keyboard running a serial terminal. I looked at using the PIC....
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Designed around the popular ZN414 ic this receiver covers the AM band from 550 - 1600 KHz with the values shown. For Longwave the coil needs to be changed. Use one from an old MW radio to save time. The ZN414 is a tuned radio frequency designed and....
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The IC tester in this web site is specially designed for the timer IC LM555. this circuit is used for testing timer IC. circuit diagram and technique of various project ...
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Energia is a rapid prototyping platform for the Texas Instruments MCU Launchpad. Energia is based on Wiring and Arduino and uses the Processing IDE....
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The following circuit shows about Ultrasonic Sensor Circuit Diagram. This circuit based on the MAX232 IC. Features: 150mA quiescent current, ....
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The objective of the circuit is to build an electronic dice based on the functions of a 555 timer integrated circuit that operates in the astable mode. LM....
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The detect ringing signal tone circuit with light and sound.It is easy to use and good quality, Do not enter the power supply. Which as Detect ringing signal...
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Pressing a single key on the keypad - will energize the relay. Entering a four-digit code of your choice - will de-energize the relay. The circuit was designed to control the Modular Burglar Alarm System - but it will have other applications. If you require....
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SA9614 is a RF Amplifier used for signal conversion and auto laser power control (ALPC) between the CD optical pickup head and decoding chip. SA9614 includes Interface of CD optical Diode RF signal Amplifier and equalizer, VREF generation circuit, Automatic....
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As shown for the speaker protection circuitry. It is designed for the left and right channels operate independently. The figure (to the left channel as an example) of R2, C4 an..
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Then I learned to drive it. Turns out my greatest enemy is inertia. What I`ve built is just so damn heavy and massive I can`t just start off the motor at full speed. Being a half-assed physicist I should know that already. But I guess experience is also....
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As we activate to adore those apathetic bleared canicule of summer, the best important affair on best of our minds is how to accumulate air-conditioned during those hot days. For some of us that agency axis up the old air conditioner and sipping on a nice....
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Voltage splitter using op-amp uA741 IC, circuit diagram, working, description....
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According to the characteristics of the system, using the drum controller to achieve the above requirements, the design of the ladder as shown in FIG. As follows: 1) C631, C633..
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As shown, the apparatus includes cavers point detection circuit and triggering display circuit. The cavers instrument is a test probe grip in the hands of another probe touches..
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An electromagnetic generator without moving parts includes a permanent magnet and a magnetic core including first and second magnetic paths. A first input coil and a first output coil extend around portions of the first magnetic path, while a second input....
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This simple variable power supply circuit has a low production cost and delivers an output voltage between 1,5 V and 15 V with a 500 mA maximum current. It....
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This manual will show you how to use each of the components in the kit, and give you software Sketch examples for each one. Then you can combine some components to make examples of Automatic Systems such as a lighting controller. The Arduino "IDE" software....
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If your are like me which I am guessing you are, then ever since you got into doing stuff with arduino you have wanted to make your own arduino board....
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The full GSM thermostat is managed by a Microchip PIC18F46K20-I/PT microcontroller, programmed with a firmware that controls the temperature and takes care of the communication with the GSM module which is the component named GSM; this is, in fact the small....
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The Spartan-6 board has on board 5v Relay interfacing, indicated as in Figure. ULN2803 is used as a driver for FPGA I/O lines, drivers output connected to relay modules. PTB connector provided for external power supply if needed...
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Colorful decorative lights loop circuit shown in Figure 3-22. It consists of the power conversion circuit, a clock signal generator toner color and lighting control circuit of ..
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A primary building block in BEAM robotics is the Solar Engine, a very simple two transistor circuit originally designed by Mark Tilden, which allows energy to be stored in a capacitor, until the charge is sufficient to briefly run a tiny motor. This means....
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All capacitors in this circuit are disc ceramic. Fixed-value resistors are 1/.-or 1/2-W carbon. Rl controls the gain of Ul. RFCl is a miniature 2.5mH rf choke. ..
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This is a variation on the astable multivibrator. Circuit was recently developed to test for N-mosfets(the power kind e.g irf830). I don?t claim circuit can test all bad mosfets or all fault mosfet conditions. If mosfet is working it will operate in the....
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This schematic shows a peak-reading diode voltmeter driven by two stages of amplification. A 100-ILF capacitor provides a fairly large time constant, which results in satisfactory meter damping. The limited differential output voltage coupled with an....
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A 20 Band EQ for my 900Watt MOSFET Power Amplifier. The Output Level would drop by the Ammount of resistors, so for 2 Equal Resistors, I should amplify it by a gainof 3. Would that propably work Eek, that is very confusing. The first schematic is a simple EQ....
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ADSP-2103 or ADIs ADSP-2105 is produced by a digital signal processor. AD7714 and the ADSP-2103/2105 interface circuit as shown in FIG. When the output is active ADSP-2103/2105..
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This circuit is essentially a light chaser but it can also be set to provides heads or tails (Two Up) or a Dice (die). It also has a speaker to simulate the sound of a spinning roulette wheel. Note that the dice and heads/tails features can be deleted if....
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The schematic diagram of the MS Decoder may look complicated but is actually quite simple. Both the Mid and Side signals are initially buffered by unity gain inverting buffers formed around IC1b and IC2 b. This is necessary for two reasons, first to ensure....
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On board the AVRs that can be programmed are those in the schematic. For other members of AVR family or the rest programmable ICs that Ponyprog can program, there is the J1 connector (CON10) which allows expanding the programmer's hardware. See Ponyprog's....
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Figure 4-33 and using substantially the same circuit configuration, the common amplifier and analog inductive circuits are provided, but its analog inductive circuit transistor..
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This simple circuit gives a positive and negative supply from a single transformer winding and one full-wave bridge. Two zener diodes in series provide the voltage division and their centerpoint is grounded..
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A 3-dimensional LED cube, which I can program, to create Art. No more "Doug Stick Figures", but something really cool. Follow along as I create Art. I looked through my parts bins to see if I had any microcontrollers left over as I was planning on doing the....
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i`ve been wrapped up in Jeep repair lately as there`s some sort of issue prevent the beloved XJ from firing up. i have, however, in the meantime had some time to work through my initial modulation tests on this version of the PT2399 circuit and nail down a....
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This circuit may be tuned to operate over the range 87-108MHz with a range of 20 or 30 metres. I have used a pair of BC548 transistors in this circuit. Although not strictly RF transistors, they still give good results. I have used an ECM Mic insert from....
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The super dimmer it is certainly better than the normal dimmer you are using now. It would be better, however, to try to prove it. Let`s see how it works....
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Originally Posted by kajunkreations The natural resonant freq of the L2 is 31.5 mhz. I calculated the 40K by using LC meter and LC resonance....
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Commercially available IR distance rangers typically handle a 3- to 30-in. detection distance. Many times, it is necessary to determine smaller distances. The circuit in Figure 1 is useful for measuring small distances to reflective surfaces. Its measurement....
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A radio controlled electronic flash is a useful item in any photographers 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 dont want wires showing in a shot like....
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Building a foxhole radio is rewarding and the basic setup is very simple. It is, however, difficult to adjust, and it may take several attempts to find a proper razor blade for the detector. This is a project that requires patience and much trial and error,....
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Alkaline Battery Charger, Battery Charger , This circuit was specifically designed to recharge alkaline cells. The unusual connection of the transistor in each charging unit will cause it to osci...
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The NE604"s signal-strength indicator section is used, based on an internal logarithmic converter. This enables a linear ..
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The transmitter part of the circuit is build around IC1(NE 555). The IC1 is wired as an astable multi vibrator operating at 40KHz. The output of IC1 is amplifier the complementary pair of transistors ( Q1 & Q2) and transmitted by the ultrasonic transmitter....
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An inductance meter could be a valuable test instrument for a hobbyist to own. However few people own them because of the high price tags found on such instruments. That`s about to change. The Inductance Meter Adapter described in this articleis a circuit....
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This ultra-bright white LED lamp works on 230V AC with minimal power consumption. It can be used to illuminate VU meters, SWR meters, etc. Ultra-bright LE....
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This Photo Instructable shows how to use two old phones as a cheap intercom between Point A and Point B. Might be useful between the house and the sh....
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Sections of RS339 quad comparator each drive LED to give indications of four different input voltage levels, While LED 1 is connected to ground for use as zero indicator Resistors shown are for Radio Shack 276-041 red LEDs ›change R6-R9 to 270 ohms and R1 to....
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The circuit was designed to work with an audio power amplifier which operated off +18v-0v-18v power rails. The actual voltage used is not too critical except that the feedback is referred to the LED chain which itself is anchored to a +12v rail, hence the....
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Most of the transistors in this speaker protector function as switches. Normally, Q4, Q5, and K1 are on and the speakers are connected to the amplifier. However, if a large dc voltage appears at an amplifier output, either Q3, or Ql and Q2 turn on, biasing....
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On Halloween night, I reguarly have periods of 5, 10, and even 15 minutes where no ToTs are around. It seemed kind of silly to me to have the fogger spewing fog during such breaks by using a standard fogger timer. Instead, I decided to build my own custom....
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This high power led mood light is based on PIC16F628 and the ability of this mcu to produce PWM pulses. Varying pulse width we can produce millions of color combinations using only the three basic colors. So only one RGB (Red-Green-Blue) led is capable....
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# The circuit can produce about 250-500mA at 2KV, depending on the transformer.
# For C1, you can use the capacitor out of an old microwave.
# This circuit is mainly provided as a demonstration of using commonly available parts for something uncommon.....
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A2N3819 FET provides a solid state VOM ‚The 2N3819 acts as a cathodefollowerin a VOM The biasoffset(meter null) is obtained with R14 and R12 sets full scale calibration R2 through R9 should totalabout10 M © R10 is a protective resistor and C2 provides ac....
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This circuit is based on a simple asymmetric oscillator. The length of time the relay remains energized - and the length of time it remains de-energized - are set independently. With the component values shown in the diagram - both periods are adjustable....
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A project on Obstacle Avoidance & Navigation of Path Tracing Manipulator for Industrial Robots. A robot is an automatically guided machine, able to do task on its own. Another common characteristic is that by its appearance or movements, a robot often....
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This circuit uses Analog Devices` AD639 universal trigonometric function generator to convert a triangle waveform, the basic waveform of the VCO itself, into a very low-distortion sine wave. By using the AD639 in its frequency tripler mode [2], the....
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Scopeclock is an easy to use hardware to make your X-Y capable analog oscilloscope more useful. Using this simple to use hardware you can convert your analog oscilloscop..
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Aubrey Scoon`s early 1940`s Beam Rays Replica Rife Machine, Aubrey Scoon s 1940 s Beam Rays Clinical replica Rife Machine was originally mistaken for a genuine 1938-1939 Beam Rays instrument built by Philip Hoyland and the Beam Rays Corporation....
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Recently, most digital video equipments, such as video recorder, DVD player and TV game, have component video output. The component video signal is like RGB video signal, but it cannot connect to RGB monitor directly. Thus I designed and built YUV(YCrCb) to....
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3 to 12 volts step up DC converter using MAX668 integrated circuit design..
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Building a stroboscope (zoetrope) from Arduino and the spindle motor of a broken Xbox 360 DVD drive. Zoetrope animations, Arduino sketch and circuit diagram included..
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The key you`ve connected to "E" is used to energize the relay. And the four keys you`ve connected to A, B, C & D - are used to de-energize it. All the other keys on the keypad are connected to "F". = When "E" is pressed - current from the "Com" terminal....
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220V (5Hz) alternating voltagepass Z1 circuit filter filtering, then it will send to the connect point of AC over voltage, under voltage protect relay K2. When normal working, K2 connect point should up-close, connect AC 220V voltage to AC current-limiting....
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This was one of my very first transceiver developments. This page was also one of the very first circuit descriptions that I put on the internet quite some years agon. Today I would not build a transceiver like I did then, but it was working, so I have kept....
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This is a 3 stage discrete amplifier with gain control. Alternative transistors such as BC109C, BC548, BC549, BC549C may be used with little change in performance. The first stage built around Q1 operates in common base configuration. This is unusable in....
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This is the complete circuit of the modern homodyne receiver. This receiver can receive AM CW and SSB transmissions...
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The circuit will provide both a sine-and square-wave output for frequencies from below 20 Hz to above 20 kHz. The frequency of oscillation is easily tuned by varying a single resistor. This is a considerable advantage over Wien-Bridge circuits where two....
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Frequency accuracy has been a topic of special interest to many amateurs and experimenters since the early days of radio. Until recently, the best frequency standard available to most hams was a crystal oscillator carefully adjusted to zero-beat with a....
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The latest addition to my collection of Infra Red (IR) Repeater circuits. The Mark 5 is a much improved version of the Mark 1 circuit and has increased range and sensitivity. It is also immune to the effects ofambient light, daylight and other forms of....
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Three-stage active Butterworth bandpass input filter is used in radioteletype demodulator to separate RTTY tones from each other and from noise. Filter is centered on 2200 Hz, and has bandpass of about 260 Hz to allow reception of some of audio sidebands....
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At the heart of the Full-Cup Detector is a 555-oscillator/timer configured to produce a 15-Hz click, until ..
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the RF design and construction of radio frequency oscillators...
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The drawback of this architecture is that it disregards the differences between the various channels. First, the subwoofer channel has a reduced bandwidth and its signal is often generated in real time by summing the low-frequency components of the....
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SFH505A made by Siemens combine infrared diode receiver, amplifier, demodulator and a filter band pass for minimizing interferences. This circuit works tog....
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The meter reading is directlyjproportiona! to the logarithm of the input light power. The logarithmic circuit behavior arises from the nonlineardiode pnjunction current/voltage relationship..
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This circuit was designed as a warning flasher to alert road users to dangerous situations in the dark. Alternatively, it can act as a bicycle light (subject to traffic regulations and legislation). White LEDs only are recommended if the circuit is used as a....
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Although the parts list calls for a ten-segment LED unit, the illustration shows two individual LEDs being used instead. This is due to lack of room on my breadboard to mount the switch assembly, two integrated circuits, and the bargraph. If you have room on....
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This sensitive circuit is basically a comparator, detecting very slight temperature changes in respect to the ambient temperature. It was primarily intended to detect draughts around doors and windows that cause energy leaks but can be used in many other....
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This design was created at the request of my father. It is designed to operate a 240V a. c. heater, in his Orchid box, to maintain a higher temperature during daylight hours than darkness. Regulator - This is a very simple regulator used here to obtain a....
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Addition of dual-triode amplifier V2 to conventional peak voltmeter reduces charging time constant while increasing available time for measuring peak value. Linearity is good up to 40 v. -M. Uno, Amplifier Improves Peak Voltmeter Response, Electronics,....
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Phase-sensitive detectors usually take the difference between an input FM signal and the same signal after it has passed through a resonant circuit, or through a delay line. A 1N34 should work fine to detect 100MHz, but not all 1N34 diodes are made alike.....
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The detector is intended to sense and signal to another circuit that an appliance is connected to the mains voltage. For this purpose, an optocoupler, IC1....
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Use CA3164A BiMOS detector/alarm system. For operation as smoke detector with electromechanical hom (Fig. 40-la), the output of driver at terminal 8 is used. Large npn transistor Q3,-with an active pull-up and transistor Q2 provide over 300 mA of drive....
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In this page we will introduce a great project designed by Toon Beerten. His project named "DIY Led Mood Lamp" can become a very interesting add-on for your room that`s absolutely sure it will impress everyone. As you can see on the photos, we talk about a....
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Function generator ranging from 0.1 Hz to 20 MHz can be easily built using MAX038 integrated circuit chip. Here is the most simple implementation of high....
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The circuit shown in Figure 1 is a simple 4-bit digital-to-analog converter. It is actually just a simple op amp summer circuit, i. e. , an operational amplifier configured to output a voltage that is proportional to the sum of the input voltages. The op-amp....
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AC has been shown as a fishing converter input circuit ND conversion Tiger Road. In order to check the AC signal and I was shown, it is provided in the input circuit AC DC conv..