Popular Circuits Page 244
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The second half controls the steering. The mechanical design is a 3 wheeled caddy with the ´single wheel´ actually a closely spaced pair of wheels which are driven by the main drive motor top provide motive power (this is the motor controlled by the first....
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A shortcoming of the above bi-directional proportional motor control circuit is that with the potentiometer in its center position the motor does not stop, but creeps due to the difficulty in setting the potentiometer for an exact 1:1 mark-space ratio from....
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The provided connections will provide configuration free usage for most Arduino boards. Some Arduino boards, such as the Mega2560, will require custom configuration. This is determined by how the ports on the Atmel AVR microcontroller are mapped to the....
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Hello, Please help me, I have designed a very basic square wave generator to run a speedometer circuit board which is providing output to control a....
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This circuit is suitable to amplify and distribute the audio signals. The input audio signal is applied to the J1 and after passing through the P1, It is buffered and amplified by the IC1 prepared to redistribute. It has 3 outputs to drive 3 audio lines with....
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This electronic rf detector electronic project is designed using common transistors and other few common electronic parts. This rf detector responds to RF signals bellow the standard broadcast band to well over 500 MHz and provides an visual, and audible....
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This circuit was designed on request, to remotely monitor when a couple of electric heaters have been left on. Its sensor must be placed in contact with the feeder to be able to monitor when the power cable is drawing current, thus causing the circuit to....
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About all that can be said about top octave generators is that they were cute and cheap, compared to other methods of tone generation. Trouble is, they were nearly perfect and to use one resulted in chords that were very flat-sounding and on organs, stops....
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The schematic diagram below show a circuit of high voltage generator. This circuit uses a 4049 hex inverter as an oscillator, and you can use ignition...
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When USB present and device needs to work, VSupply is directly provided by the USB and PMOS separates the battery from the supply. (R3 ensures PMOS is on when there is no USB) Primary reason for this is not to disturb the proper charging of the battery.....
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Small digital design using a Xilinx picoblaze softcore processor, and I`m finding that producing schematics of acceptable quality to be frustrating and time consuming. I`ve attempted to shoehorn previously drawn schematics (From LTSpice, or Eagle) into....
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Improving the Canon 5D Mark II audio so that it can produce usable production audio. The first part of any engineering effort is data gathering, so I set about to measure the input frequency response of the 5D. My end goal was to use the Marantz PMD661 field....
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LM35 Smart Heater Controller SchematicMinuscule circuit of the electronic heater controller presented here is built around the renowned 3-Pin Integrated Temperature Sensor LM35 (IC1) from NSC. Besides, a popular BiMos Op-amp CA3140 (IC2) is used to sense the....
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LED`s lining the headliner, and have them fade in when the door is opened, fade out when the door is closed. I think it should be simple. from what i gather i`m going to need: i don`t really know. basically i need to know what circuits will be necessary to....
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The LTC1754 is a micropower charge pump DC/DC converter that produces a regulated output. The input voltage range is 2V to 4. 4V for 3. 3V output and 2. 7V to 5. 5V for 5V output. Extremely low operating current and a low external parts count (one flying....
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This design is based on the 18 Watt Audio Amplifier, and was developed mainly to satisfy the requests of correspondents unable to locate the TLE2141C chip. It uses the widespread NE5532 Dual IC but, obviously, its power output will be comprised in the 9. 5 -....
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Metal Detector Circuit Overview The metal detector circuit is an electronic circuit that is specifically designed to detect metal that lies deep in the water...
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Although it does not have the same charm as real mercury barometers with long glass tubes on pieces of carved and polished wood, the Torricelli barometer discussed here is a functional equivalent and electronic replica of the Torricelli barometer. Actually,....
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A preamp designed for the minimalist, and having no frills at all is the design goal for this project. It is designed as a preamp for the Death of Zen (DoZ) Class-A power amp (Project 36), and has very low levels of noise and distortion, in a minimum....
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This is a simple LED torch circuit based on IC MAX660 from MAXIM semiconductors. The MAX 660 is a CMOS type monolithic type voltage converter IC. The IC can easily drive three extra bright white LEDs. The LEDs are connected in parallel to the output pin 8 of....
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This circuit is a 73 MHz Hallogene Lamp Radio-Controlled. The purpose of it is to control the power state of a hallogene lamp by a remote control. When we press the push botton of the remonte control, the power state of the lamp will be changed, so, if the....
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This Schmitt trigger circuit is ``emitter coupled`` and provides a simple comparator action. The 2N3069 JFET places very little loading on the measured input. Schmitt Trigger, emitter coupled, simple comparator, 2N3565, distinct hysteresis loop,...
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This is a class AB transistor power amplifier. It is a simple amplifier to build, uses standard parts and is stable and reliable. The entire circuit utilizes commonly available components and may be simply built over a general-purpose board. But this....
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RGB Video Amplifier with OSD Input, MM1381XD, MM1382XD and MM1383XD are wideband RGB Video Amplifiers with OSD input, developed for monitors. The main differences among them are Video amp bandwidth, output rise time, and output fall time. By Mitsumi....
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The quad operational amplifier circuit yields full 0 to 100 percent pulse width control. The controller uses an LM3900 requires only a single supply voltage of 4-30 V. The pulse repetition frequency is set by a 1 kHz oscillator amplifier that integrates AI.....
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The circuit can generate a negative output from a positive supply or a positive output from a negative supply. When the circuit starts up, the substrate diode of the output FET bootstraps the output voltage to the point where synchronous switching takes over...
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The HA-4900 series comparators can be used as versatile logic interface devices, as shown in these circuits. Negati..
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Some channels offer a separate audio mode (SAP) in a second language. It is usually transmitted on 6.8 MHz, whi..
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The classic state-variable (two-integrator) filter (see Fig. A) is famous for its insensitivity to device parameter tolerances, as well as its ability to provide three simultaneous separate outputs: high pass, bandpass, and low pass. These advantages often....
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If you refer to the above schematic, you`ll notice that the VGA-to-Scope converter has been simplified, while op-amp buffers and inverters were simply eliminated. The continuous current supply to charge up the capacitor can be replaced by a 1Meg pot from 5V....
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The circuit just required 2 transistors to drive the relay the the relay act as a switch to activate the buzzer. Any number of normally-open switches may possibly be applied. Fit the mercury switches to ensure that they close when the steering is. The....
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This voltage to frequency converter circuit has an oscillator that is voltage controlled and has a small, 0.5% deviation. IC1 function as a multivibrator a...
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This circuit must be connected to a 5 volt DC source. See my RR page for several 5 volt supplies. Note the flashing LED is optional, but looks s-o-o-o-o good on the top of a locomotive...
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The crystal is placed between the collector of the output stage and the base of the input stage. The frequency of oscillation can be set to a precise value with trimmer capacitor CI. The range of operation for this circuit is 500 kHz to 10 MHz..
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Idea of this circuit came to me at midnight when my pet dog started barking continuously on sensing a moving shadow, perhaps that of an intruder. Dogs have a night adaptation capability to maximise the sensitivity of vision in low light. They are well....
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Circuit element appears more problematic is Shu. Since long time after the start button, even if the turtles produce sperm Viagra. When Pi Wen Cut for large electric-like tyran..
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LM1800 is an integrated FM stereo demodulator IC which has a number of good features integrated on it which makes it possible to design a high quality FM stereo demodulator system with excellent sound quality. The LM 1800 uses phase locked loop technology to....
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A grasshopper is a switch that is ready to go off at any time. A piece of plastic is placed between two switch contacts to keep them apart and connected to cotton thread fixed to the floor. When the object is moved, the cotton pulls the plastic out of the....
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This circuit is capable of driving filament lamps of nominal rating 200 mA at 60 V dc from a CMOS logic signal. The lamp or load is connected in series with the Darlington transistor TR1 and emitter resistor R5. The Zener diode ZD1 establishes a soft....
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The CMX469A is a single-chip CMOS LSI circuit which operates as a full-duplex 1200, 2400 or 4800 baud FFSK/MSK modem. The mark and space frequencies are 1200/1800, 1200/2400 and 2400/4800 Hz respectively. Tone frequencies are phase continuous; transitions....
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Circuit shown in Figure 3-190. The line in the armature circuit in series two startup resistor Ri, Rz, through the main switch SA to achieve start, stop and speed control. Duri..
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The designer is seeking the solution with higher efficiency, with lower power consumption, in the hope of reducing the needless energy loss. Utilize syntony inductance to shake the capacitive LLC syntony converter harmoniously, use the zero voltage switch....
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With this cool cat/dog repeller circuit you could chase the cats off from any where you want. In fact, I designed this circuit to chase my cat from my computer table. Most of the animals like cats respond violently to ultrasonic sound and in fact it`s the....
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With a single IC, you can build a simple, reliable auto burglar alarm or a similar alarm. See (a) for the timing informatio..
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Normally 555 timer circuit even though the start push-button PB1 is not pressed, the timer keeps consuming power From the battery due to a potential divider formed by three 5k © resistors within the IC. this power consumption known as the idling power....
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The project we have chosen as our example is an RS232 to RS485 converter. This is a often needed device which can demonstrate a lot of principles of circuit design, and hopefully the finished project will be useful to some people, just as it stands. Without....
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The series of light switches this time slightly different from the stress of work. The series of light switches can work directly on the AC power network. Light switches are using the main component of TRIAC and LDR. The circuit is very simple and the....
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Here is a white-LED-based emergency light that offers the following advantages. 1-It is highly bright due to the use of white LEDs. 2-The light turns on automatically when mains supply fails, and turns off when mains power resumes. 3-It has its own battery....
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Fig. 3-100 is a two-speed motor stator windings lead wiring diagram 2Y/Y-connected. ..
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How to do the landscaping project supervision programs were recommended by satellite relay protection and automatic safety device static General table three remote program information Petrochemical Engineering Construction Electrical Transmission inverted....
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This 1-cable system carries composite video (NTSC, PAL, or SECAM), power, and channelselect signals. The interfa..
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This Ultrasonic Sensor Circuit consists of a set of ultrasonic receiver and transmitter which operate at the same frequency. When something moves in the area covered the circuit`s fine balance is disturbed and the alarm is triggered. The ultrasonic circuit....
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The system consists of two parts: the Arduino board that detects the led pulses and sends the data via the XBee module, and a PC that recive the data through a USB/Xbee module and processes the data with LabVIEW so you can prepare and study the consumption....
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High speed optocouplers technical parameters are: Rise time t1 ‰¤ 300ns; Circuit eye transfer ratio CTR = 50%; Isolation voltage VSO ‰¥ 15000V; Output transistor reverse breakdown voltage V (BR) CEO ‰¥ 50V. The optical coupler can be widely used for the....
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Today we discuss about a simple solar LED circuit. We know that solar panels comes from 12Volt 3watt to larger sizes. So, for storing energy, we need a 12Volt battery. As we don`t want jhamela`, we prefer SLA SMF batteries. 12Volt SMF batteries comes around....
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The system of using this circuit is positioning a little magnet close to the stalk switch SW1 while being connected to the hand or garments of the individual holding the sack with the use of a tiny cable. Since the circuit is tiny, it can be put in a tiny....
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Voltage fluctuation is a serious issue in every home. Due to some reasons our supply voltage may rise above 110V or 230V. Flow of this high electricity may lead to the damage of our home electrical devices. Have you thought how electrical protection is....
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As the title implies, the present circuit is intended to convert sinusoidal input signals to TTL output signals. It can handle inputs of more than 100 mV....
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Here`s a single chip FM transmitter circuit using Maxim semiconductors IC MAX2606. The MAX2606 is a compact, high-performance intermediate frequency VCO specially designed for wireless communication circuits. They have monolithic construction with low-noise....
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This accomplishing is acclimatized to rebroadcast the achievement of a CD player, television receiver, or radio receiver. I use it so that I can move about the abode and accept to my admired programs after advancing others. Within and the house, I....
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It is widely thought that light can be therapeutic for the human skin and soul. Light at the correct wavelength may also be effective against depression and allergies. There is a wide range of products on the market, at prices from a few tens of pounds to a....
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During summer nights, the temperature is initially quite high. As time passes, the temperature starts dropping. Also, after a person falls asleep, the metabolic rate of one's body decreases. Thus, initially the fan/cooler needs to be run at full speed. As....
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Driving the highway with your high-beam headlights can really increase your visibility, but can he a blinding hazard for other drivers. This simple circuit can be wired into your headlight switch to provide automatic switching between high and low beam....
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This infrared alarm barrier can be used to detect persons passing through doorways, corridors and small gates. The transmitter emits a beam of infrared light which is invisible to the human eye. The buzzer at the output of the receiver is activated when the....
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The circuit design employs a VHF amplifier adjusted in such a way that it will operate in the frequency range of 88 to 108 MHz, as part of the Band 2 Radi....
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In this fire alarm circuit project, a thermistor works as the heat sensor. When temperature increases, its resistance decreases, and vice versa. At normal....
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Most homes today have at least a few infrared remote controls, whether they be for the television, the video recorder, the stereo, etc. Despite that fact, who among us has not cursed the light that remained lit after we just sat down in a comfortable chair....
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This metal detector electronic project schematic circuit is designed using a simple 555 timer integrated circuit. As you can see in the schematic circuit, this metal detector electronic project requires few external electronic parts. ..
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In this circuit, a simple calculator, in conjunction with a COB (chip-on-board) from an analogue quartz clock, is used to make a telephone call meter. The calculator enables conversion of STD/ISD calls to local call equivalents and always displays current....
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There is one class of filter called "all-pass" that does not affect the response, only phase. While at first look this might be thought rather pointless, like all circuits that have been developed over the years it often comes in very handy. Filters also....
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The second program just sends "Hello world" to the PC. By default my board uses the Virtual COM Port (VCP) driver so you can view the output using Hyperterminal or similar program, I recommend PuTTY. The setup is quite simple, when I plug the PCB into my PC,....
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This simple but effective circuit can be used to control water level in a container. The prototype is used to pump water out of a bucket that collects condensation from a home air-conditioning system. The design is based around a 555 timer (IC1). Although....
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A simple circuit with which we have the possibility opening and closing the RL1 contacts. He becomes touching a small metal surface. Clue of situation that is found RL1, is become by the Led D3. The supply of circuit is +12V, the IC1 is supplied with 3.9V....
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A dual benefit for battery-powered portable devices is provided by Class D audio amplifier. The produce much less power dissipation than do their linear cousins...
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Hi All, I am currently working on a project that requires a 0-10V DC supply to be converted into a linear fequency range - square wave. for instance....
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The basic circuit described in this document is capable of generating up to 30 kilovolts or more from a low voltage DC source using the flyback (LOPT) transformer salvaged from a B/W or color TV or computer monitor. Typical output with a 12 VDC 2 A power....
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A simple yet accurate automatic, regulated 6/12/24 volt lead acid battery charger circuit is explained in this article. The circuit switches off the current to the battery as soon as the battery reaches full charge. An illuminated LED at the output....
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edit - There are information not included in this main post. Read through the thread for more information on timer calibration and other useful information by cpfers. - PEU pointed out the TX to be connected to serial port pin 2 instead of 3. This now....
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This chapter provides detailed schematics of a variety of power supplies suitable for use with the common Ar/Kr ion tubes available to the hobbyist on the surplus market. Included are examples of commercial designs (Omnichrome 150R and 532 head, Lexel 88 and....
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Many electronic circuits need an indication that they are under power; for most ac circuits, a neon lamp is ..
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The circuit will generate precision triangle and square waves. The output amplitude of the square wave is set by the output swing of op amp Al, xndRl/R2 sets the triangle amplitude. The frequency of oscillation in either case is approximately l/0.69ftC. The....
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The peak output voltage will be approximately 15,000 to 20,000 volts, but this will vary with the ignition coil type and the voltage at which the MOV starts conducting. Do not touch any part of the 555 circuit including any leads of the timing resistors or....
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Switch-mode power supplies offer the benefit of a much greater efficiency than obtainable with a traditional ..
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The circuit was designed to create an electronic oscillator known as Wien Bridge Oscillator which can be used for the creation of low frequency sine wave....
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The Multi function frequency meter is an instrument that can measurement many things in a single display with LED 7 segment 8 digit. The controls measures....