Popular Circuits Page 127
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This Power Converter is used in LHC Machine to power superconductive magnets. It is located in the LHC underground installation, close to the loads to limit cable losses in the underground installation. A high current high frequency (25 kHz) switch mode....
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All DAC boards includes supply part. It is enough to connect only power transformer. Here I offer board for toroidal 10VA transformer manufactured by Talema which has pins to the PCB and it has very small radiation of electromagnetic field to the....
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The amp was called "El Cheapo 2-30", and was rated at a maximum of 30W per channel into 16 Ohms. It used a single regulated power supply and capacitor coupled speaker. Having a scan of the original, I can now reproduce the exact circuit details. It was a....
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You can use a single-supply system to precisely measure the temperature at a remote location with less than 1°C error over a 0 to 100°C range (Figure 1). The circuit includes T1, a low-cost AD590 temperature sensor; IC1, an AD8541 rail-to-rail amplifier;....
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Very first PIC program using C language. Explains how to blink a single LED using PIC microcontroller with C program. Start learning C programming for PIC here....
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This circuit for a compressor uses a high-fidelity external op amp, and a high gain and wide bandwidth. A compensation network input is necessary for stability. The rectifier capacitor (Cg) is not grounded. but it is linked to the output of an op amp....
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The Implantable Lamp (A3024) is a radio-controlled lamp powered by a battery. Once encapsulated in epoxy and silicone, it is water-proof and compact, so so that it may be implanted in an animal. The A3024 can, in theory, be activated by any....
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Traditional control-system designs use separate switches to control power and various system functions, but adding a few components to a small, microprocessor-based system can combine a control function with the system`s on/off switch. For example, you can....
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This article describes three options for interfacing the DS1859 to the MAX3735. Itincludes a new technique using an opamp that gives a linear transfer function that can be adjusted for any arbitrary current range. All of these techniques can be appl....
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The Adjustable Timer circuit starts timing when switched on. The green LED lights to show that timing is in progress. When the time period is over the green LED turns off, the red LED turns on and the bleeper sounds. The time period is set....
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A motor spins the "propeller", and a small microprocessor keeps track of time and changes the pattern on seven LEDs with exact timing to simulate a 7 by 30 array of LEDs. It is an illusion, but it works nicely. Propeller clocks were to my knowledge first....
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Circuit and assembly process of the line stage in two separate articles. The linestage shares the same circuit with the two chassis version which was already presented. Only this time power supply and preamp will be in one housing which will be in the same....
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An audible field strength indicator (AFSI) lets you listen to changes in radio signal strength so that you can use your eyes to look for concealed antennas. Using inexpensive, easy-to-obtain parts, the following design combines a sensitive amplified field....
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The capacitors needed for the power supply are massive to try to get rid of hum, and massive means expensive. The "improved" Zen is a little better, since it uses an inductor (or choke) in the supply - obviously the hum drove someone mad. Inductors are....
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This circuit uses a complementary pair comprising npn metallic transistor T1 (BC109) and pnp germanium transistor T2 (AC188) to detect heat (due to outbre....
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This is one of the most neat projects to build using a PIC. The design of the clock is mainly a clone of Bob Blick `s propeller clock, along with a few modifications of mine. I used a PIC16F84A microcontroller. I`d have to admit that the programming end of....
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Configured with capacitive coupling (by inserting a small cap between photo-transistor and bipolar transistor), this relay circuit will respond only to rapid....
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Applications such as photoelectric control, temperature detection and moisture sensing require a circuit that can accurately detect a given resistance ratio. A simple technique that uses an op amp as a sensing element can provide 0,5% accuracy with low parts....
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Circle i {JA, C two-phase grid connection line. a. c technology turbine shed two lines. A, a voltage between Ri by Buck, convex - Diu chain flow. R., R3. wl dividing aftercrop ..
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It uses CD4584B six Schmitt trigger IC (Di ~ Ds). Wherein Di and Ri, RG composition photometric circuit, D2 and RP, C2 composed of adjustable frequency (adjustment potentiometer RP) ultra-low frequency oscillation device, D3 ~ D6 in parallel as output....
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This project makes a PIC microcontroller play audio PCM sounds using PWM modulation! Pulse-code modulation (PCM) is a digital representation of....
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How to get an LED-Wiz to control pinball solenoids. Rottendog Amusements makes modern replacement Driver Boards like this Williams WPC89/WPC-S replacement. While it is better than the originals, this board is still rather large, though it does handle more....
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Virtually any NPN small signal transistor may be used in place of the BC 108 shown. Likewise any suitable NPN power transistor can be used in place of the 2N3055. The output transistor must be mounted on a suitable heat-sink. Short circuit protection may be....
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Using LM723 regulator can be designed a very simple variable power supply circuit which can provide a maximum current up to 2A and a variable voltage between 2 and 25 volts...
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The SA608 is a low voltage high performance monolithic FM IF system incorporating a mixer Oscillator two limiting intermediate frequency Amplifiers quadrature detector, logarithmic received signal strength indicator (RSSI), voltage Regulator and Audio and....
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Magnetic stimulation is a non-invasive method of stimulating the brain and peripheral nervous system using induced currents. When used to stimulate the brain it is normally referred to as Transcranial Magnetic Stimulation or TMS. The basic principle is shown....
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It consists only from Microchip PIC 16F84 cpu and LCD text module. Author states that this counter is capable metering frequencies from 400Hz to 50MHz. I used faster, 20MHz version of 16F84A-20I/P, and it managed to count 80MHz oscillator output...
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The oscillator, Q1, is a standard overtone circuit. A fifth-overtone crystal, 80.545 MHz, is operated on the seventh overtone, 112.763 MHz. C6 couples the output of the oscillator to Q2, which operates as a doubler to 225.5 MHz. A double-tuned circuit....
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The circuit in Figure 1 provides 32 steps of brightness controlfrom 0 to 100%for a backlight or instrument panel, using just two general-purpose-microprocessor signals. In addition, the circuit requires little board space, because it uses only three SOT-23s....
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Above diagram is a very easy and efficient receiver for actuating garage doors, starter motors, alarms, warning systems and many some other possibilities. The SCR, which has a extremely low trigger current of 30 uA is typical - it demands an input....
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When the motor is connected in this fashion, the netduino activates the transistor, but nothing happens. If i swap the motor with an LED, the LED does light up, so that incidates that the motor isnt getting enough power. So i connect the motor direct to....
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The bus is connected to the 2G—5 shrouded conenctor N9. The two CAN bus signals are fed into the PCP2551 CAN bus transceiver U2. The output of U2 is fed to the UART transmit and receive signals on the PIC16F688 microcontroller U1. 8-pins of the U1 are....
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One of the motors always seem to hesitate and be on or off randomly. Also the motors are just very unpredictable in general (with this setup that is). When I use them independently they work fine without any hesitation or anything. Regarding your GPS unit,....
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The completed board may be driven by voltages between .8 and 3 Volts. While the basic design goal was candle like light from a single cell, the values used were chosen to allow safe operation from 3 Volts so you can, for example, use it to drain the last bit....
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This nifty sound level meter is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear out. The whole circuit is based on the LM3915 audio level IC and uses only a few external components...
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In the circuit shown below, if the voltage at the output terminals rises above 6.2V, zener conducts charging capacitor C4. This voltage will fire the silicon-controlled rectifier (SCR), which quickly shorts-or puts a ?crowbar? ? across the supply rails....
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The circuit of the unit is fairly simple, but is a bit irksome to set up. The reason is that obtaining matched FETs is not easy, so I had to make sure that the circuit would work with off-the-shelf FETs.
The phase shifter is a standard opamp circuit, and....
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Digital controller password as shown by the nine-digit password, and a total of 11 keys, including four pseudo-code keys, 7 keys have two valid keys for the overlay keys, the n..
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Free-energy" or "G-solar energy" as solar infrared radiation energy stored in the gravitational field. Alternative terms: "Aether heat", "2nd-material layer Heat" In the link below, professor KonstantinMeyldescribes in detail simple experimental setting of....
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You can`t expect great performance from such a simple detector-based meter. Sensitivity is just adequate enough to get a basic idea of the power that your transmitter is capable of....
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As shown in FIG relay the delayed release operational amplifier circuit. When the power switch, the inverting input terminal of the operational amplifier is added resistor 4.7k..
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Computer control system, you can detect the signal path switching means dressing a lot, you need a lot of input interface expansion Wei, so can all switch signal input into the..
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The input signal drives ICD. Because ICD"s positive input (V+) is slightly offset to + 0.1 V, its steady state ..
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TDA1072AT is a special purpose integrated circuit for AM radio receiver from Philips Semiconductors. The integrated circuit is designed for mains-fed home receivers and car radios. The voltage-controlled oscillator provides signals with extremely low....
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I bought a SF-AW210 405nm diode and was running it off my LM317 power supply. I have been running my harvested DVD 16x burner laser diode in this....
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The aesthetics of case modding` (modifying a PC`s enclosure) offer plenty of scope for debate and plenty of scope for original circuits. Low current LED indicators are usuallytted in PC enclosures. Although this certainly saves energy, the LEDs do not light....
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This page contains some information on circuits which can be used for triggering stroboscopes from external circuits. The circuit here are designed to be integrate to strboscope circuits so that they can triggered using external trigger pulse. The standard....
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Here a single IC 556 has been incorporated for creating the PWM pulses. One half of the IC has been configured as the high frequency generator for feeding the other half IC which is rigged as a pulse width modulator. The sample modulating frequency is....
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This amplifier is the outdoor type, line installed outdoors, the amp`s main line; Figure 2 is the indoor power line box. Indoor and outdoor use between 50 ohm or 75 ohm coaxial cable to connect. e› 3 Figure 3, Figure 4 is the amplifier circuit board, and....
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TDA1510 Philips company's audio power amplifier. The IC features a load short {open load, overheat protection circuit. Having an output of static voltage stability, ripple..
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The circuit is based on the theory that insects like mosquito can be repelled by using sound frequencies in the ultrasonic (above 20KHz) range. The circuit is nothing but a PLL IC CMOS 4047 wired as an oscillator working at 22KHz. A complementary symmetry....
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This UHF transmitter is designed for low power applications as remote for garage doors and operating systems, wireless alarm. This UHF FM transmitter with....
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This regulated power supply consists of step-down transformer Tl, a full-wave rectifier bridge (D1 through D4), and a filtering regulator circuit made up of Cl, C2, Rl, R2, R8, D5, and Ql, When 120 Vac is provided, the neon-lamp assembly LI lights up, and....
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It is small and compact stereo amplifier is powerful but can easily be used to replace your broken amplifier or new construction, or to make an active speaker, in all cases combined with a preamplifier. With remarkable feature smake it the true Hi-Fi....
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This site describes how to build a low-budget DIY Canon RC-1 infrared remote control clone based on an AVR microcontroller....
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U2 is a decade counter /divider, Ul is used as a switch debouncer. For a self-generating system, connect a resisor..
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The basic MK484 (Replacement for the ZN414) connected in its minimum configuration as a radio receiver for the A.M. Broadcast band and the upper half of the United States' FCC Part 15 Lowfer (1600-1750 meter) band. Its a circuit straight out of the....
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Differential amplifier circuit has a constant current source road ..
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With this compact FM adaptor circuit plugged into the audio out of your cassete player or i Pod out put, you can listen your favorite music on your car stereo. This circuit is very useful if your car stereo doesnot have an auxillary in socket. The circuit is....
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If you need to hold an analog signal for infinite period then this digital sample and hold circuit is the solution. This circuit uses a Exar XR-2240 programmable timer/counter as main component. The Exar XR-2240 is triggered when strobe input is applied. The....
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As shown in the circuit, there is the incident at the time, this circuit is connected with photoresistor LDR transistor is turned high or zero level. Amplification factor of tr..
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This is a second-order, low-pass filter with programmable cutoff frequency. This circuit should be driven from a low-source impedance since there are paths from the output to the input through the unselected networks. Virtually any filter function which....
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By no means is this a necessary addition to the benjolin but its one I`ve had some fun playing with and decided to add to my Modular Benjolin design. This circuit is a dual Attack/Release envelope generator. The AR is especially useful when combined with the....
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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 battery-powered monitor has been designed to provide an audible indication of keying for those whose rigs lack a CW sidetone. Its sensor wire is wrapped around the transceiver`s coax no direct connection is required. Of course Morse isn`t the only use....
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I like to post some thoughts on some of the functions of the Great Pyramid of Egypt. It's been claimed that the Great Pyramid might be a Power Plant, a Tomb, a Transmitter/Receiver to talk with some other Worlds, or a message from Atlanteans to future....
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The BQ2000 is a programmable, monolithic IC for fast-charge management of nickel cadmium (NiCd), nickel metal-hydride (NiMH), or lithium-ion (Li-Ion) batteries in single- or multi-chemistry applications. The BQ2000 detects the battery chemistry and proceeds....
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6AQ5W / 6005UL four-channel single-ended amplifier circuit shown in FIG. Shown are only - channels. 4-channel system - using a power transformer for voltage amplification section uses Tokyo light sound 4CP-2508-SA type 4 with volume potentiometer..
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The use of public-key-encrypted algorithms within licensed applications can prevent hackers from cracking the licensed algorithms. Moreover, you can use them to disable licensed features that a user doesn`t purchase. Licensing schemes eventually arrive at....
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Look for the blanket internal disconnection circuit, its working principle is: M spot welding have a wire about 2cm induction body, when a sense of..
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Using this design, you can construct an electromagnetically impulsed pendulum clock with a 1-second beat. On the prototype, the pendulum rod is 115cm long with a bob adjusted to make it beat every second. It is suspended on a short piece of mainspring from a....
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Transistors Ql, Q2, and Q3 monitor the two outputs of the stereo amplifier. If the offsets exceed 2 V, Q7 is turned off, which turns off Q8 and the normally on relay. Diodes D2 and D5, together with Q4, provide a mains voltage monitor. As soon as the ac....
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It initializes a particular port for working with keypad. A global variable keypad Port must be defined before using this function. Port need to be initialized before calling this function. This function reads key when a key is pressed and it returnsnumber....
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When a key is pressed the remote control sends a preamble followed by 32 bits of information encoded using these pulse timings. Examples of these pulses can be seen below as logic analyser screen dumps (the glitches are bugs in the Logic analyser software).....
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For FM demodulation applications where the bandwidth is less than 10% of the carrier frequency, an XR-J567 can be used to detect the presence of the carrier signal. The output of the XR-567 is used to turn off the FM demodulator when no carrier is present,....
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This circuit shows about TLV3702 Laser Pointer Sensor Circuit Diagram . Features: such as starting a robot, perfectly functional for controlling a ....
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This article describes a dc-ac inverter circuit that generates the high-voltage ac signal required to drive an electroluminescent (EL) panel. It`s based on the Sipex SP4425 EL lamp-driver IC..
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an intermediate to advanced project and I do not recommend it as a first project if you are just getting started in synths or electronics. Only the circuit and some explanation are shown here. A lot of project building, troubleshooting and electronics....
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The most commonly available headphones have an impedance of 2 × 32 ?, this relatively low value makes them unsuitable for such a design. However, with a bit of crafty transformation these headphones can be used in just such a design. To adapt them,....
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This article is an attenuated tone control circuit diagram. This circuit is mainly composed of transistors and RC networks are network components. As shown..
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Continuity tester to check continuity in the circuit (Insakittochekka) is. The continuity check over the circuit board wiring that can be checked at a lower voltage semiconductors do not conduct contained in the circuit, you can just check the wiring short....
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This Design Idea shows how you can use Linear Technology`s LTC6903 programmable oscillator as a clock source for direct-digital synthesis, data conversion, switched-capacitor filtering, clock, and voltage-controlled oscillator circuits...
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Short circuits in the tracks, points or wiring are almost inevitable when building or operating a model railway. Although transformers for model systems must be protected against short circuits by built-in bimetallic switches, the response time of such....
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Circuit shown in Figure. Higher technical specifications of the circuit, is a very good OTL amplifier circuit. The frequency response of the..
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This handy circuit can be used as a speed controller for a 12V motor rated up to 5A (continuous) or as a dimmer for a 12V halogen or standard incandescent lamp rated up to 50W. It varies the power to the load (motor or lamp) using pulse width modulation....
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This is a schematic diagram of a three-phase pulse generator circuit. This circuit produce 3 phase overlapped output similar with 3 phase AC powerline, you....