Popular Circuits Page 76
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A car door differs from a calculator or a phone in that it makes sense to press more than one key at a time..
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This is a high-brightness LED-driver circuit. To provide a constant-voltage output we usually use DC/DC regulators. But constant-current output is the one that....
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This simple circuit uses a 741 op-amp in differential mode as a continuity tester. The voltage difference between the non-inverting and inverting inputs is amplified by the full open loop gain of the op-amp. Ignore the 470k and the 10k control for the....
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The function generator features two BNC outputs : one for the high speed [1 to 8 MHz] square signal (BNC1) and another for the DDS signal (BNC2). Offset and amplitude can be regulated by two potentiometers : offset in range of +5V to -5V (POT1) and amplitude....
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The following circuit shows about SciTech PS-3R Power Supply Circuit. Features: 13.8vDC, 5 Amps Surge, 3 Amps Constant. Component: Transistor, ....
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Used this circuit once to track down the location of a plastic pipe, buried underground. It transmits a weak RF signal, which can be picked up by a portable AM radio from about 6 feet away...
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Application Circuit biaxial magnetic field sensor shown. Using a biaxial magnetic sensor HMC1002, two AMP04 (A1, A2), the magnetic field can simultaneously measure the X-axis d..
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Previously I used a linear regulator, now I use Max756 ( ) boost converter. I`m seeing 0. 1 - 0. 3V output ripple in the current. The Max756 datasheet says I should expect about 50 mA ripple. So my power is a little noisier than expected, but my real problem....
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The wah will work before the amplifier but sounds very low in volume and it sounds scratchy when the wah is rocked back and forth. The wah is fine without the buffer. In front of a fuzz face, with the fuzz face on, no sound passes Bizarre indeed. I`m going....
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The aim of a DC power supply is to provide the required level of DC power to the load using an AC supply at the input. Different applications require different attributes, but more often than not these days DC power supplies provide an accurate output....
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A bar-graph LED driver is used to drive 10 LEDs to give a relative indication of moisture. The moisture probes are connec..
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C141C datasheet, .Selling leads from all over the world, ChinaICMart is the world`s biggest IC trading marketplace on the internet. We offer finest suppliers for C141C, you can also download the datasheet for C141C..
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This circuit operates an automotive windscreen washer pump to fill a 20-litre drum from a 205-litre water reservoir. The drum is suspended above a drip line, which irrigates a vegetable garden. Two stainless steel probes mounted in the drum act as sensors....
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This simple circuit can be used as an aid for sensing the distance between the rear bumper of the car and any obstacle behind the car. The distance can be understood from the combination of the LEDs (D5 to D7) glowing. At 25cm D7 will glow, at 20 cm D7&D6....
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Beeps if you leave open the door over 20 seconds This circuit, enclosed into a small box, is placed in the fridge near the lamp (if any) or the opening. W....
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This article aims to introduce to beginners and intermediate readers a simple solution to build a digital to analog converter, based on the famous r/2r resistors network. This article also discuss a problem encountered by many beginners while trying to build....
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Low-noise preamplifier circuit It shows a typical low-noise preamplifier circuit, an amplifier may be used to signal ..
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This schematic diagram shows a circuit of basic logic gate circuit. This PNP transistor circuit can act as OR gate or AND gate. If the input is closing of...
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The charger operates by supplying a short current pulse through a series resistor and then monitoring the battery voltage to determine if another pulse is required. The current can be adjusted by changing the series resistor or adjusting the input voltage.....
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Make those LEDs into LED bar graphs that will show the intensity. For example, I want a song with a loud base to make the bar graph shoot up to the top. The bars of the LED bar graph I would like to just be individual LEDs. I was getting the effect with an....
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This circuit of multimedia speakers for PCs has single-chip-based design, low-voltage power supply, compatibility with USB power, easy heat-sinking, low cost, high flexibility and wide temperature tolerance. At the heart of the circuit is IC TDA2822M. This....
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Electronic horn circuit diagram. When power line is switched on, a general/basic tone is produced by transistor T2 and transformer X1, that is frequency-modulated by the wandering voltage generator, which, in turn, is affected by the low-frequency squarewave....
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This white LED flood lights illuminates your porch with cool white light. The circuit is too simple and energy saving design. Its current consumption is pr....
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If you don`t have an audio detector already constructed, you can use a nice set of audio headphones (closed-cup style, that completely covers your ears) and a 120V/6V step-down transformer to build a sensitive audio detector without volume control or....
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The circuit in Figure 1 shows how a thermistor applies temperature compensation to the circuit`s output-current limit.
The MAX1714`s linear current-limit (ILIM) input range at Pin 6 of IC1 spans 0.5 to 2V, which corresponds to current-limit thresholds of....
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Common monostable circuit in two ways: manual start type and start pulse type. Single-shot pulse start ..
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FIG circuit, the oil pressure sensor is converted into a variable resistor Rt. Due to changes in Rt, changing the size of each transistor is biased, three LEDs (red, yellow, gr..
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By adding a discharge path to the upper MOSFET of a cascode circuit, the unavoidable Miller effect is greatly reduced and the PFC performance of a power supply`s front end can be improved..
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This two-zone alarm has automatic exit, entry and siren cut-off timers. It was developed for the Beginner`s Guide To Cmos Timers. So it has a particularly detailed circuit description. There`s an optional One-Time-Only module. It will force the siren to....
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The microcontroller IC is a device that looks like a common IC. But inside it, the virtual a miniature computer. This device can be used instead of transistors....
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It is the conversion circuit, which can transform ±10V voltage into ±lmA, and the input voltage is changed into current by the A1 and VTl, VT2, and it is used to change the current direction. The input end is added 2mA bias current, when the input voltage is....
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The thermostat circuit built to control a 1300 watt space heater which are controlled with a small pulse transformer. Component: LM339 IC, ....
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To control the motor, i will be using an H-bridge with a DPDT relay like you can see on this schematic below. If you want more details, look on this....
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A loop antenna can greatly improve medium wave reception. Loop antennas
are directional and receive signals along the plane of the windings. The
directional quality improves signal to noise ratio of the desired signal
while rejecting signals perpendular....
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This simple circuit functions as a 12 LED chaser. A single illuminated LED 'walks' left and right in a repeating sequence, similar to the effect seen on KITT, the car in the Knight Rider TV series.
Fully commented source code and programmer ready HEX....
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The versatile 5 pin L200C regulator offers both voltage and current regulation in a single package. The IC also features thermal shutdown and input over voltage protection up to 60 Vdc. The package is also available as L200CV which has straight pins for....
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Brushless motor rotor, a stator and a drive circuit Relationship between the brushless motor rotor, a stator and a drive circuit is shown in Fig. The initial state illustrated ..
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Laser Command is a game which I build using a 8x8 matrix LED and an Arduino Mini. This game was developed as a "sample" class project in S10-05833 Gadgets, Sensors and Activity Recognition in HCI. The class is taught by Scott Hudson at Carnegie Mellon....
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By gluing a standoff to the center of the cone, an inexpensive 2", 8 ohm speaker becomes a vibration sensor with a naturalresonance below 100Hz which is quite good. My implementation is shown below: After the epoxy cured, the speaker was hung in the middle....
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That simple 4 digits converter circuit has OUTPUT COUNT = 1 according to my f-IMHz to 10.000. All diodes are IN4146 `POLYSTYRENE` NPO. The circuit uses the LF398 at input..
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Here is the circuit diagram of V/F Converter in negative input voltage. It uses the VFC32 voltage-to-frequency converter. This VFC32 used to be applied in...
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The LTC ®4251B/LTC4251B-1/LTC4251B-2 negative voltage Hot Swap controllers allow a board to be safely inserted and removed from a live backplane. Output current is controlled by three stages of current limiting: a timed circuit breaker, active current....
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This small water sensor alarm circuit makes a loud warning sound when a humidity sensor detects a quantity of water. This circuit assembly is an application of low power comparator LM1801 made by National Semiconductor. The reference voltage for the....
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The circuit uses a Hall-effect sensor, which consists of an IC that resides in a small gap in a flux-collector toroid, to measure dc current from 1 to 40 A. Wrap the current-carrying wire through the toroid; the Hall voltage VH is then linearly proportional....
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When the water is empty the wires in the tank are open circuited and the 180K resistors pulls the switch low hence opening the switch and LEDs are OFF. As the water starts filling up, first the wire in the tank connected to S1 and the + supply are shorted by....
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This website was created to help students find idea for their project/FYP. All the content presented here are found from me, reliable blogs, website and forums. The owner of this website takes no responsibility what so ever for any of the content. If you....
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Wow. System 7 thankyou so very much for your appreciative response to my Humble creation. My wife would not say i was gifted but Anal to the ooint....
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This two-zone alarm has automatic exit, entry and siren cut-off timers. It was developed for the Beginner`s Guide To Cmos Timers. So it has a particularly detailed circuit description. There`s an optional One-Time-Only module. It will force the siren to....
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Shown for the automatic traffic intersection traffic light control circuit. Four monostable delay circuit inclusive The controller consists of four 555 (IC2 ~ IC5) and a number of RC components connected together. 8V input voltage through the 78M05 regulator..
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The design of low-phase-noise oscillators requires careful attention to resonator unloaded Q. In the construction of a low-phase-noise, high-frequency oscillator, the goal is to achieve an unloaded-Q figure greater than 400 in a reasonable package. Also, you....
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Most analogue multimeters are capable of measuring resistance over quite a wide range of values, but are rather inconvenient in use due to the reverse reading scale which is also non-linear. This can also give poor accuracy due to cramping of the scale that....
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Here you got it! 300 W rf authentic ability for fm transmission. 300 W radio ability amplifier for accomplished 88 108 MHz ! This fm amplifier has 2 TP9383 abundant to bear up to 300W. ..
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Generic Digital Switches are in-circuit programmable devices made by Lattice Semiconductor that allow pin to pin routing, buffering, and inversion. Perfect for making last minute circuit changes. Don't muck around with the software provided by Lattice, do it....
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Some years ago, one of the fundamental electronic instruments was the laboratory curve tracer. A CRT display would sweep out terminal behavior (current versus voltage) from which you could derive mathematical models. Classic presentations of diodes,....
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This article is of interest only to readers whose bicycle lights are powered by a dynamo. The laws on bicycle lights in the United Kingdom are stricter th....
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The AQV20 series should be fine to drive an A. C. relay coil if the de-energizing back EMF from the relay coil does not exceed 600 v rating. It is diode in series with a conducting MOSFET. Might want to add two back to back zener surge suppressors across....
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Simon18F is a project to replace the custom MB4850 processor of the MB Electronics Simon game with a PIC18F2550; initially to emulate the original Simon games and, later, to enhance the existing games and add new ones. The Simon18F processor board is based....
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The Tab antenna is a folded monopole that you miniaturize by forming it into an inverted L with a downward bend at the end (Figure 1). You can solder it perpendicular to a pc board or build it as part of a pc board and place it at a corner. The folded....
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A total of six buffer circuits (using three dual op-amp packages), five for the input channels and one for the master output channel. (2) High input impedance (particularly for the five buffers tapping channel faders). (3) Low output impedance (<600 ohm),....
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The dc voltage present on a telephone line is usually around 45 to 50 V on-hook and 6 V off-hook. This circuit uses This drop in voltage to activate a relay. The relay controls a cassette tapeTecorder...
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UPS (Uninterruptible Power Supply) Reference Design provides a ready-made uninterruptible power supply solution with the flexibility of a microcontroller - PIC17C43 that offers a low cost solution and high performance not found in other microcontrollers. The....
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In order to programm devices which run at 3. 3V (either SPI-based ones like AVRs or JTAG-based ones like CPLDs), the input and output signal levels need appropriate level conversion (or level shifting) because a 5V input may not see HIGH at 3. 3V and a 3. 3V....
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The bat ultrasounds are picked up by the microphone SPKR1 and go through two stages of amplification at Q1 and Q2.
Separately, a tunable (R12) single frequency is produced by the LM567 oscillator U1. The LM567 is a tone decoder but here its input is....
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Temperature-indicator and temperature-based products have generated wide interest. There are numerous applications for such devices with many possible solutions, each with its own advantages and disadvantages. This idea discusses a sensor interface that....
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This is a design circuit for amplifier was designed in order to fill the gap in the 3-10 Watts power output range of the audio amplifiers available on RED Free Circuit Designs. Therefore a simple, very low parts-count amplifier, was designed on the same....
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Piezo buzzers can be found everywhere, next time you throw out an old smoke detector be sure to remove the piezoelectric element from it and stash it in your parts bin. If you want to monitor sound with a piezoelectric element it`s not that easy since the....
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Boil water or cook with gas stove, it is sometimes due to water spills extinguish the fire mission, if not found to cause a lot of gas bF overflow occurs risk of poisoning. Thi..
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This is a circuit of difference amplifier. This circuit is an inverting amplifier that allows the subtraction of two voltages and that is the summing....
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The infra-red (IR) toggle switch project described here is aimed to provide control mechanism for electrical appliances that do not have remote operation features. The goal is to construct a black box where you can plug-in your 120V AC appliance and control....
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This circuit shows about Honda S90 Haynes Electrical Wiring Circuit Diagram. Features: shows the connection between Honda parts Component: fuse ....
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The LED car voltmeter consists of the filter circuit, voltage distribution filter circuit, voltage amplifier circuit and LED display circuit, see as figure 7-77. The regulator filter circuit consists of the 3-terminal IC1 and filter capacitor C1. The voltage....
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This is another 100watt inverter circuit diagram. Built based on IC CD4047 and Mosfet IRF540, this inverter have ability to supply electronic device -which require 220VAC- up to 100w from 2-3A transformer....
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Apart from the diode (which replacement would need a PbS, Lead Sulphyde, galena cristal) everything you can see in the circuit (for the no power version) can be built with enamel wire, alluminium cooking foil, carton wax and so on. The real painful part is....
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Here`s a really simple and inexpensive ($1) LED driver circuit. The circuit is a constant current source, which means that it keeps the LED brightne....
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Tiny, portable Guitar Amplifiers are useful for practice on the go and in bedroom/living room environment. Usually, they can be battery powered and feature a headphone output. This project is formed by an FET input circuitry, featuring a High/Low sensitivity....
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As shown in FIG TDA4866 constituted by an external signal generator circuit protection. The role of the internal protection circuit is out of control, the external protection c..
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Four 4, 8 Volt 2000mA Nickel Cadmium batteries. Does anybody here know a safe way of initial charging those batteries from a lab power supply I do not have a NiCad charger so I need to make one. Any circuit drawings of a simple NiCad charger I will be glad....
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A monostable multivibrator using IC CD4538. It is a precision monostable/astable multivibrator IC free from false triggering. This can be used for various application in which precise timing cycle is required. CD4538 is the precision monostable/astable....
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Circuit principle: This circuit uses three-terminal adjustable integrated voltage regulator, S gear set, the power supply voltage via a step-down transformer 17. 5VX2 alternati..
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The amplifier has an adjustable gain, which is performed by. R1 (a 1 Mega Ohm variable resistor). It controls the feedback of the 741 opamp, which in turn drive a 2N2222 output transistor. The circuit takes the audio signal rom the condenser microphone &....
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I have used this type of circuits for quick testing of telephone equipment. This is a quick hack that does not exactly resemble the characteristics of the real telephone network, but is enough for this kind if applications. If you want better simulation,....
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As shown having a multi-stage delay circuit is output. The operational amplifier circuit used as comparators, operational amplifier A1 when the applied voltage-inverting input ..
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Using only one IC and six passive components, this pulse generator has a frequency range of 400 to 4000 Hz and an adjustable duty cycle of 1 to 99%. A threshold detector (ICA) and an integrator (ICB) generate a triangular waveform. A positive voltage at the....
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Im looking for a Light timer/ dimmer Like something you would find on a Dome light. but dont know where to start ..
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This circuit uses12V DC instead od mains AC. This is very good idea if you don`t want to mess with direct mains voltage connected circuit or you want to run the stroboscope from batteries. Flash Slave Trigger : Flash slaves are used when you need to....
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Circuit works: This is an AC blown fuse alarm. When BX is not when blown, 220 V AC voltage through a VD1 VD4 bridge rectifier, R1 limiting buck, after DW 6V DC..
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This circuit is a small +5V power supply, which is useful when experimenting with digital electronics. Small inexpensive wall tranformers with variable output voltage are available from any electronics shop and supermarket. Those transformers are easily....
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This is a selection of small self-contained alarm circuits. They have a very low standby current; and are suitable for battery operation...
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This circuit will flash a white LED, on a supply from 2v to 6v and produce a very bright flash. The circuit takes about 2mA and old cells can be used. The two 100u electros in parallel produce a better flash when the supply is 6v...
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Many sites doesn`t provide circuits driving these transformers, they simply say that they are bad. I don`t agree. In fact I built this circuit. I spent a lot of time for finding resonant frequency (around 15Khz) and duty cycle. These transformers best work at..
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This schematic diagram is about TMP01 Fahrenheit Scale Temperature Sensor circuit. This circuit is used to convert VPTAT into an output that can be read....