Popular Circuits Page 193
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The ADXL362 is an ultralow power, 3-axis MEMS accelerometer that consumes less than 2 ?A at a 100 Hz output data rate and 270 nA when in motion triggered wake-up mode. Unlike accelerometers that use power duty cycling to achieve low power consumption, the....
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You have to admit that these tiny electronic lamps are handy, and they last almost forever. Around 40 years after Nick Holanyak developed the first LED, they have become just about indispensable. Any self-respecting electronics hobbyist always has a few in....
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This circuit provides complete speed control over car"s windshield wipers. They can be slowed down to any rate even down to four sweeps per minute..
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Boil water on the kitchen gas stove, once the water is boiling, if not stalled, spilling boiling water will come out, the flame extinguished. Gas spills, very safe. Water can s..
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This key code switch circuit is a type of electronic circuit that is created to replace conventional normal key switch. Without inserts a keys. But you can....
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4 Channel Infrared (IR) Remote is a simple kit using the famous HT12A and HT12D encoder / decoder chips from Holtek...
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It's very simple actually. The idea is that we use what we have learned from the capacitor tests to create a circuit that uses the capacitors to run the load and then by discharging the 1/2 full capacitor into a DC-DC converter we can recharge the initial....
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This is a Basic Cadmium Sulfide (Cds) Photocell Detector circuit. In this circuit, when the light falling on the photocell (PC 1) is blocked, its resistance will increase and the voltage across PC 1 will rise. When the voltage rises above 1/2 of the supply....
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C ircuit of a new type of remote control switch is described here. This circuit functions with inaudible (ultrasonic) sound. Sound of frequency up to 20 kHz is audible to human beings. The sound of frequency above 20 kHz is called ultrasonic sound. The....
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R1 controls the trip-point of the circuit. adjust it accordingly. to reverse the logic (have the led light up when the battery has at least X amount of power,) connect the led to ground through R4...
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Atmel On the PC keyboard PS 2 AT89C2051 keylogers circuit connection cable connects to the circuit between what is written in the wake of the program running...
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Latching Continuity Tester. Source: Eldon L. Knight, Tony van Roon A continuity tester is a must on every service bench for testing cables, pcboards, switches, motors, plugs, jacks,...
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This circuit will double almost any DC input voltage as well as handling plenty of current. 12 to 24V is just an example. With a few changes, it can also supply any desired output voltage. There are many possible applications. One I can think of would be to....
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Here is a one transistor LED flasher circuit which will flash a super bright LED. The circuit is using single transistor as driver which is taking flash rate from the LED 2 which is a self flashing LED. The flash rate can be adjusted by changing the value of....
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Right- and left-channel signals pass through 1 C4-a and -b buffer amps into active crossover IG5; low frequencies are sent to the IC6-c mixer, and middle and high frequencies are sent to the analog delay lines of 1C1 and 1C2. That output passes through....
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Application ikW high pressure mercury lamp ballast system; Figure 12.44 shows IR213D ikW for a high pressure mercury lamp ballast system schematic. Figure, not only IR2130 is u..
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The RGB blue box turns your PC"s RGB-monitor screen blue at the flip of a switch. That is, it makes your computer display bright white text on a blue background, instead of the usual low-intensity white on black. The RGB .blue box connects between your....
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Relays AC arc welding machine load since the three-way power circuit shown in Figure 522 relay KA selection type, 24V; time relay KT selection JS7 Ying, 0.4-180s...
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The simplest of all motor controllers (besides a straight on/off switch) is the contactor controller. I designed this contactor controller for use in my electric scooter project. It is based around three 12V relays, two 12V batteries, two switches and of....
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This RF antenna amplifier can be used for high frequency and VHF band ( for radio and TV) and will provide a 22 dB gain. This RF antenna amplifier electronic project has a very low noise, under 1. 6dB. L1 coil has a 6uH value, but can be used any coil for....
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Circuit shown in Figure 3-187. When you start, then people start auto ZQB step-down transformer. After a period of delay, ZQB out of operation, the motor increases the speed at..
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A milliamp meter can be used as a volt meter by adding a series resistance. The resistance needed is the full scale voltage reading divided by the full scale current of the meter movement. So, if you have a 1 milliamp meter and you want to read 0-10 volts....
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Here is a simple Power resumption alarm circuit that can be fixed inside the switch box itself. It gives beeps when the power resumes after a power failure...
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The Digital Addressable Lighting Interface (DALI), international standard prlEC929, is a communication protocol
and method to interface lighting units on a 2-wire network. The DALI protocol is 16 bits and supports addressing up
to 64 ballasts individually,....
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Getting the power from your 110 volt receptacle to a suitable foam cutting format presents several problems. A standard light dimmer can be successfully used to vary the heat, but it can`t heat the wire in a direct circuit. With a light dimmer powered by....
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The objective of this project is to make a controller based model to count number of persons visiting particular room and accordingly light up the room. Here we can use sensor and can know present number of persons. In today`s world, there is a continuous....
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PIC RTC: A Real Time Clock IC using the DS1307 and a PIC micro. This PIC project uses an I2C Real Time Clock chip and display to create a four digit standard desk clock....
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hi everyone, my name is mike, i come from a small country called new zealand- i am currently planning to build a 6l6 push pull stereo power and pre....
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After the turn-off circuit is first applied to the next KA KA, intermediate interval required less than Is, this is because when the time is up to 3 times the charge time const..
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This was a Student Project of mine, it is a very basic instruments that could do most of the tasks on a test bench. The cabinet used, was available as a part of a Hi-Fi DIY System, The Range and Mode switches were Modular Stackable Interlocked MultiPole....
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The metal detector circuit shown here must represent the limits of simplicity for a metal detector, yet the design works surprisingly well. It uses just one 40106 hex Schmitt inverter IC, a capacitor and a search coil and of course the batteries. A lead from....
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This is a very simple square wave generator circuit built with IC 74LS00 that can generate square signals with frequencies between 20 Hz and 1 MHz. Its stability is good enough for most applications. The output freq. is dimensioned through the RC components....
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This design came about as a result of efforts to design a high stability reference which locked to a 10MHz source. With some minor hardware adaptation and completely new firmware, it proved possible to design an excellent GPS Disciplined Oscillator (GPSDO)....
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This circuit is mainly intended to provide common home stereo amplifiers with a microphone input. The battery supply is a good compromise: in this manner the input circuit is free from mains low frequency hum pick-up and connection to the amplifier is more....
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The LM4844 is an integrated Audio sub-system designed for stereo cell phone applications. Operating on a 3. 3V supply, it combines a stereo speaker Amplifier delivering 495mW per channel into an 8& load and a stereo OCL Headphone Amplifier delivering 33mW....
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Function Generator is an essential laboratory equipment. The module described here is based on high quality XR2206 IC. 1Hz - 2MHz XR2206 Function Generator is capable of producing high quality sine, square and triangle waveforms of high-stability and....
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This circuit is a Digital Radar Speedometer. It allows us to evaluate the speed of any object moving, especially cars and other vehicles. The speed is calculated in kilometers per hour (KPH). Its display has three digits. This radar works with the laser....
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This is design circuit for a low-cost voltage reference circuit. Its main component is a general-purpose operational amplifier, the 741, configured to output a buffered fixed reference voltage for use by other IC`s or circuits, such as an Analog-to-Digital....
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The circuitry of the Regency shows some peculiarities. The circuit of the self-oscillating mixer stage, the base bias voltage of the second IF stage from the AF power stage, the unusual IF of 262KHz and the supply voltage of 22. 5 V are all characteristic of....
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The most popular LCD interface is the Hitachi 44780 based LCD controller chip which provides a fairly easy to work with interface and low power consumption. The major drawback of the interface is the perceived complexity of working with the interface. This....
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A monostable relay has two states: operative when a large enough current flows through its coil and quiesc..
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This is by far the simplest VUmeter you can build. It is based on a single chip. A volume unit (VU) meter or standard volume indicator is a device for displaying the level of any voltage signal source (which is usually a sound signal). Connect the module to....
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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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The article describes a simple and very cheap to drive white, blue or UV LEDs, used for example in small lamps and testers. The cost of components shall not exceed CZK 10. Converters for white LED has been on the pages of journals described quite enough.....
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Sensing element Ql is a 2N3904 general-purpose npn transistor, although any general-purpose npn unit in a T0-92 style case will do. IC1, an LM334, supplies Ql with a constant current that is independent of temperature. An LM324 quad op amp, IC2, forms a....
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A common problem in crystal sinusoidal oscillators is the excitation of unwanted modes of the quartz crystal that degrade the spectral purity of the oscillator. This problem is significant in overtone crystals, particularly if the oscillator is intended for....
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We have modified the schematic diagram above with the addition of a 220uF smoothing capacitor between the base of transistor Q1 and ground. Without this capacitor, the relay chatter (relay switching on and off many times per second) was terrible around the....
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CD4060 Timer Circuit 1 minute to 2 hours This is a 1 minute to two-hour timer switch. The 14-stage binary ripple counter Type 4060, IC1, has an....
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More Flexibility For Low-Power Synchronous Buck Converters Modern synchronous buck converters for portable applications provide so called power-save mode operation to maintain high efficiency over the entire....
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The video transmissions from this unit can be received on a small Portable/Tunable and battery operated TV set such as the ones you find in flea markets, etc...
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This is a integrated electronic mailbox circuit diagram, A front door open.And when people open. When the cabinet photo detector attached to the light, it will ....
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This is not just another dimmer circuit. The improved design of this dimmer circuit enables its triac to be triggered with lower voltage values. Normally, the triggering voltage of a triac is around 70V. In some applications though, it is desirable to use a....
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Manual stabilisers are still popular because of their simple construction, low cost, and high reliability due to the absence of any relays while covering....
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Colpitts 1MHz To 20 MHz Crystal Oscillator Circuit This is a simple Colpitts crystal oscillator for 1 to 20 MHz, PARTS....
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In this circuit, four IRF510 power FETs are driven by a CMOS counter to generate the necessary two-phase drive quadrature. Although ICs are available to do this, this approach is handy for the experimenter because it uses commonly available parts. The....
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By adjusting the oscillators so their frequencies are very nearly the same, the difference between them is made audible as a beat note, this beat note changes slightly when the search loop is moved over or near to a piece of metal. It has been found in....
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A diode IN4148 temperature circuit is shown. The circuit temperature range - 25-125, accuracy of soil 0.5. Core elements of the operational amplifier circuit is four LMC660, it..
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Twisted-pair wiring is a wiring technique that usually used for in-building data communication. Compared to conventional coaxial-cable, this technique offers...
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What that flip-flop does, but mostly why those two NAND gates aren`t just inverters. and why the one on the bottom (and the inverter next to it) are even there. You should wait with accepting the answer and allow others to have a look and write up their....
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The Ping Ultrasonic Distance Sensor by Parallax has three pins. These pins are +5V, I/O, and Ground. In order to activate the sensor, a 5 microsecond 5V signal must be sent to the I/O pin. The sensor then waits 750 microseconds before sending an ultrasonic....
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A warm weather problem with 2003 Audi A6 2. 7T. When the car sits in the sun the radio loses reception for about 10 minutes until the inside cools down (appears correlated). I also have noticed that intermittently my reverse sensor horn is not beeping (not....
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AC power supply circuit as shown in FIG. It mainly consists of power supply, the reference voltage, the comparator voltage sampling circuit, and several other units. Mains tran..
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Frequency shift keying (FSK) is a popular digital modulation technique for data transmission. Some common applications of FSK modulation include both wired and wireless data transmission as well as infrared remote controls for consumer electronic equipment.....
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Most universal chargers to charge the battery 9 V (8.4 V more). However, while the charging of NiCd or NiMH rechargeable governed by a special circuit or a microprocessor, 9 V batteries are recharged mostly from current sources. I use several of these....
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You can transform a 7415124 multivibrator into a wideband VCO by replacing it conventional fixed capacitor with a variable-capacitance diode. The only disadvantage of this scheme is the 30-V biasing voltage that the diode requires. Capacitors C1 and C2....
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Some 15 years ago it was common to see small key-holders emitting an intermittent beep for a couple of seconds after its owner whistled. These devices contained a special purpose IC and therefore were not suited to home construction. The present circuit is....
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The ear protector is actually a peak audio-detector/shutdown circuit that disables the amplifier through its chip-disable input when the output volume of an amplifier reaches the set level. The circuit, although intended for the MC34119 amplifier,..
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This circuit is shows how a low drift preamplifier can be added to improve the measurement resolution of a thermocouple. The preamp is powered from the reference regulator, and bridge feedback is used to bias the preamp input within its common mode range.....
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Power-supply sequencing tutorial uses the MAX16046 system-management IC. Configuration software simplifies the configuration of the tolerances and the sequence order....
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By the pLPC1342V and NE (two company names and fever on the tube amplifier circuit 2SA1227A 2SC2987A composed of maximum output power up to 120W, the cutoff frequency up to 500..
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The 20-MHz clock phase-locks to Apple"s Mac II 10-MHz NuBus clock. It uses a simple, inexpensive CMOS circuitry to generate 10-and 20-MHz square waves. The output duty cycle settings are insensitive to Vee variations. The input to the circuit is a NuBus....
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this project use PIC18F25K20 microcontroller to detect if the sensor change state and it will emit a sound from the speaker or piezo, the MCU also detect the voltage of the battery in the startup, the algorithm it s very simple use an interrupt on change to....
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This is the figure simple telephone ring tone generator circuit designed using only a few components. It produces simulated telephone ring tone and needs only DC voltage (4. 5V DC to 12V DC). One may use this circuit in ordinary intercom or phone-type....
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I plan on building a ""high power"" amp using the KT88. Found the following circuits: 1) Which will be the better quality one to build? 2) Are ....
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This is my first post here, i need help on my final year project to make a grid connected inverter. For the full bridge inverter circuit i planned to....
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This device was designed to use two generic-patterned, pre-made, pre-drilled circuit boards that are available from Radio Shack, and other places. Parts consist of: two generic pre-etched and pre-drilled PCBs (printed circuit boards), 136 precision 1%,....
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Remote Control Mains Switch As the only electronics engineer in my family and circle of friends, it is sometimes not possible to evade an appeal for help ..
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This is a low-cost project for 20 or 40 watt fluorescent tubes. However the most efficient is to use a 40 watt tube (or two 20 watt tubes in series). It's a circuit you can put together from junk box components or build from a kit. It's very simple to build....
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Using only a single transistor and few passive components, you can build a fairly sensitive peak detector. circuit This peak detector circuit is suitable for...
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I don`t believe it was ever intended to be powered off a 9V battery. They`re feeble! Under 2 hours with an Alkaline, or....
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The circuit converts frequency to voltage by taking the average de value of the pulses from the 7 4121 monostable multivibrator. The one shot is triggered by the positive-going ac signal at the input of the 529 comparator. The amplifier acts as a de....
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PIC16F84A Digital Thermometer Circuit The digital thermometer circuit is built, almost all by using the temperature sensor of some form of discrete components,...
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Touch the sensor of the alarm with your finger and it starts beeping, goes on for some time and then stops. Touching it again, and it goes again! This litt...
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Circuit USB Soundcard Circuit with PCM2702 schematics Circuit Electronics, Creating a sound card is not more complex problems. If you useGreat IC PCM2702 from Burr RED / Texas Instruments you can create a cardUSB sound fully functional. The....
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Input J4 has offset function provided that no plug is inserted into J4 as the switching contact of J4 is connected to the positive supply voltage in this case (via the protection resistor R8). At J5 the inverting sum of all inputs is available. J6 outputs....
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This circuit is a Digital Radar Speedometer. It allows us to evaluate the speed of any object moving, especially cars and other vehicles. The speed is calculated in kilometers per hour (KPH). Its display has three digits. This radar works with the laser....
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This circuit provides an audible and visual low voltage warning for 12V battery powered devices. When the battery voltage is above the set point (typically 11V), the circuit is idle. If the battery voltage should fall below the set point, the LED will light....
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This preamplifier was designed as a stand-alone portable unit, useful to control the signals generated by guitar pick-ups, particularly the contact "bug" types applied to acoustic instruments. Obviously it can be used with any type of instrument and pick-up.....
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Reverse engineered circuit diagram of a motor speed regulator out of a portable pocket tape recorder containing a single motor for all functions. This circuit works amazingly well, keeping the motor speed constant regardless of shaft load and battery voltage...