Popular Circuits Page 69
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In electronics, a digital-to-analog converter (DAC or D-to-A) is a device for converting a digital (usually binary) code to an analog signal (current, voltage or electric charge). You can use DAC for testing circuits and amplifiers or for generating the high....
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This electronic ignition circuit is intended to be inserted into a car"s conventional ignition system. In effect, it re..
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The GHF1 is a small generator covering the HF and LF band from 30 Hz to 30 MHz in 6 ranges. The sinusoidal signal obtained can be amplitude modulated (AM) or frequency (FM).
The GHF1 also has a sweep function.
An LCD display 2 x 16 characters allows the....
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Vacuum Tubes 807 and 1625 are commonly used by hams as power amplifiers. Both tubes are audio power amplifier beam tetrodes in the output stage of high power amplifiers but they are suitable for high frequencies also. Both tubes are equal in their....
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Maxim/Dallas > Designer`s Library > App Notes > DISPLAY DRIVERS
Keywords: Single FET Controls 2nd LED Array in Switch-Mode LED Backlight
Related Parts
APP 1871: Feb 03, 2003
Download, PDF FormatDownload, PDF Format (29kB)
APPLICATION....
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555 in the use of time-based circuit design from the timer circuit, generally will be 555 monostable circuit is connected, so connected so that the circuit design is simple, re..
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The transistor shown is a P-channel MOSFET acting as a "high-side switch". More commonly, an N-channel MOSFET low-side switch is used, but what you have will work as long once you add something to the drain such as in this image of P-Channel MOSFET switch....
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The equation is: Putting some values to this equation, if a circuit has a resistance of 25 ohms (O) and a potential of 125 volts, the current that is drawn in this circuit would be 5 amps. This basic circuit will give you some understanding for the next....
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Useful as a transmitter tune-up meter or an RF sniffer, this is an RF field strength indicator that is loosely based on the Broad Band RF Field Strength Probe, described elsewhere. It detects RF via a square law detector, basically its a crystal set with....
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Amplifier A1 by the voltage across the sense resistor sensors to monitor the load current ILOAD. Power management channel uses a similar circuit, the difference is integrated r..
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The following circuit shows about LED Knight Rider Circuit Diagram. This circuit based on the 4017 and 555 IC. Features: Knight Rider circuit, 4 ....
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Now we will build a very simple photoresistor circuit to make a photoresistor do what it does: make the circuit work when there is light and stop working when there is darkness. For this circuit, we connect a photoresistor to an LED. When the photoresistor....
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Installing the camera in office, home, or the shop becomes economically feasible because the price of security camera going down. It is not efficient if we....
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Alternating positive and negative voltage pulses of high-frequency transformer T secondary sensing, full-wave rectified by the rectifier High frequency switching diodes V1, V2 ..
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This circuit is a circuit diagram 12V inverter is very easy to build, cheap components that many electronics hobbyists may even already have. Though it is possible to build a more powerful circuit, the complexity caused by the very heavy currents to be....
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How to transmit data between PC and AVR Atmega8 micro controller using USART module. We use COM port of PC based on RS232 protocol & UART of AVR....
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In this circuit a non-locking push switch is used to activate a load. The load remains switched on until power is removed from the circuit. The load is represented by R5 and D1, but could be a lamp, a relay or another circuit. S2 breaks power to the circuit....
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This DIY magnetic field sensor circuit is very simple and can detect fixed magnetic fields or fields that are varying at an audio frequency. The unit is not intended to provide accurate measurement of magnetic field strength. A small and not very powerfull....
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How to Mod the Servomotors (look at the pictures) Remove the four screws from the servo and take it all apart. Remove the electronics keeping only the wires from th....
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4017 LED Knight Rider Running Light Circuit Diagram In this 4017 Knight Rider circuit, the 555 is wired as an oscillator. It can be adjusted to give....
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Here we provided several schematic drawings of battery charger circuit. These circuits covered 5W~200W NiCd, NIMH, Lead-Acid, and Li-Ion/Polymer, LiFePo4 battery packs. We hope chargers circuits files can help our users to select correct chargers also can....
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The circuit works from dc to 50 MHz and will deliver pulses as short as 10 ns. It is driven by a TTL signal through a 740S00 quad Schottky NAND gate, ICA through ICD. Transistor Ql, wired as a common-emitter amplifier, drives transistor Q2, a simple emitter....
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It uses old pulse dial handsets and replaces the AC bell set with a 9 volt DC buzzer. The whole circuit runs from a 12 volt regulated DC supply and is suitable for short term battery operation (eg: Gel Cell). The Link is designed to enable one call at a time....
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Is the battery empty, or is there something wrong with the device That`s always a difficult question when your walkman or some other battery-powered device appears to be dead when you switch it on. Before you take it to the shop for servicing, the first....
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The circuit has a built-in, self-arming feature. The driver turns off the ignition, presses the arm button on theComputalarm, and leaves the car. Within 20 seconds, the alarm arms itself—all automatically! The circuit will then detect the opening of any....
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25kHz using thyristor inverter welding machine circuit Using high frequency 25kHz, thyristor inverter arc welding machine, which can be smaller transformer, the circuit shown i..
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Circuit IC1 provides a do amplification of 40 dB, which drops to about 20 dB when the frequency rises above 500 Hz. To minimize the (resistor) noise and the load of the op amp at higher frequencies, the value of R3 is a compromise. The associated polystyrene....
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The circuit diagram shown below explains it all, no need of any complicated circuitry, just connect a 0-1 V FSD moving coil meter across the relevant pins of the IC, set the pot appropriately, and you are ready with your room temperature sensor circuit...
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A PING Ultrasonic Range Finder to build up a system which is capable of detect and measure the distance (in mm unit) of the closest object in front of the sensor. It is like a digital measuring tape where you point the sensor to an object, press the read....
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With this technique, an extra cable to power the fm antenna amplifier is unnecessary. The RF signal and the DC current supplying the amplifier use the cable simultaneously. Check another FM antenna booster circuit diagram. The RF signal is however prevented....
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The circuit in Figure 1 accommodates lower cutoff frequencies without sacrificing the step-response time. A window comparator monitors the delta (difference) between the filter's input and output. When the delta exceeds ±50 mV, the filter increases its slew....
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By master controller and PQS1 Series Magnetic control panel consisting of a control circuit for controlling the bridge crane hoist lifting mechanism of control. Master controll..
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The following article explains how to design a minimal Running Disco Light Circuit Diagram using IC 4017. The IC 4017 is a 16 pin dual featuring in line package IC consists of a 10 stage decade counter/barrier. further in a row in this area the IC 4017....
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With an NE555 you are also able to build an astable multivibrator or blinker. Find out how, and what you need to be aware of....
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This ultra-bright white LED lamp works on 230V AC with minimal power consumption. It can be used to illuminate VU meters, SWR meters, etc. Ultra-bright LEDs available in the market cost Rs 8 to 15. These LEDs emit a 1000-6000mCd bright white light like....
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A simple test circuit to fault find audio and radio equipment. Can be used to inject a square wave signal, rich in harmonics, or used with headphones as an audio tracer....
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An electromagnetic field probe designed to detect changing electric and magnetic fields....
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This is basically a crystal radio with an audio amplifier which is fairly sensitive and receives several strong stations in the Los Angeles area with a minimal 15 foot antenna. Longer antennas will provide a stronger signal but the selectivity will be worse....
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To hook up the three Pot connections you will firstly need to establish the tags and the positions that I refer to. If you take the pot and look at the back of it, then make sure that the tags are at the top of the pot, then; The only thing that will happen....
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Figure 1 shows a typical dual battery charger. This circuit
can charge batteries with up to 4A and switch continuously
down to zero load currents. This circuit takes advantage
of ceramic capacitors space saving features without producing any audible....
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INTRODUCTION It is very important to keep a track of the working of almost all the automated and semi-automated devices, be it a washing machine, an autonomous....
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Sixteenth street control circuit composed of the second decoding output control circuit. Connect an bistable circuit that composed of dual D flip-flop CD4013 to every output terminal of the sixteen decoding. Connect a DC relay on each output terminals of....
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AC contactor Cli suction units, motor was switched on at the same time, CJ1 pair of contacts to the thyristor SCR shorted SCR it off. Contactor C interesting by the diode DC vo..
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You can connect seven-segment LCDs using only a two-wire interface (Figure 1). The two-wire interface may be at the field-effect, direct-drive LCD or at a serial interface (such as I2C) that uses an eight-pin microcontroller. The design in Figure 1 uses an....
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A flushing toilet is something that most city dwellers take for granted, but it can be a luxury for those who live away from utility water and electricity. This circuit provides on-off pump switching for a small 12 Volt pump that is used to fill a toilet....
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Use for this antenna tube of 10mm diameter. Or you can use a brass rod of about 7mm diameter. The top one is a strong copper (brass) wire of 5 to 7 mm diameter soldered directly to the coil and mounted to the PVC isolator to give a strong construction...
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The 555 circuit can be re-triggered if the input is held low longer than the output pulse. To prevent this happening, I have included a further timing circuit comprised of the 1Meg resistor and 47n capacitor. Normally, the 47n capacitor is discharged via the....
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Installing a small dash mounted 2 speed fan in my motorhome. What`s the best way Use your 1 channel and then find a relay or use the 4 channel and use the seperate wires [1 low spd. &1 high spd ] Any other lideas Would it hurt the unit if it were placed in....
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Cooking with Induction Heating Technology Induction heating is a well-known technology and very commonly used for cooking appliances because of its high energy efficiency. The single ended....
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It is well know that pests like rats, mice etc are repelled by ultrasonic frequency in the range of 30 kHz to 50 kHz. Human beings can't hear these high-frequency sounds. Unfortunately, all pests do not react at the same ultrasonic frequency. While some....
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Currently using stereo decoder IC itself because the manufacturing process can ensure separation between the two channels of 45 dB or more, only to the intermediate frequency a..
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Various techniques can be used to control the speed of a dc motor, such as using the phase-locked-loop principles, digital inputs, or analog inputs. If desired, the speed of the motor may also be monitored with LED or LCD displays. The project digital DC....
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Electric driving is an important equipment for the modernization of the plant material transport, the traditional control methods, mostly semi-manually operated automatic contr..
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With the following circuit you can easily program the AVR microcontrollers AT90S1200, AT90S2313 (or ATtiny2313), AT90S8515 and AT90S4414, using the freeware programmer PonyProg by Claudio Lanconelli. You can download the program for free from the author`s....
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Schematic shows R4 at the emmiter of the transistor, as amb and majkel have suggested it should be between the opamp and transistor, this is also the correct configuration in the canamp. The amp i managed to get a look at has been modified and has had the....
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A 0-to-5 V input drives the negative input of LM392 comparator if reset (pin 12) if DC4060BE is pulled high then low, all out..
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It uses the mains supply via a simple DC rectifier circuit...
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The following circuit shows about Slave Flash Light Control Circuit Diagram. Features: 68mH Inductor, give auto trigger for secondary flash light, ....
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The R-C twin-tee passive circuit supplies band-reject (notch) filtering to portable applications. It has a circuit Q (loaded) of 0. 25. Satisfactory rejection can be achieved when the bridge is balanced (close tolerances of adjustable components) and the....
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Portable Mixer. High-quality modular design. 9V Battery powered - Very low current drawing. Preamp, tone control, mixer - all in one. Electronics project. Circuit diagram. Schematics....
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The original TX was designed to be only PULSE Modulated for a proportional R/C system, but I later used the same circuit to make an HF bands Amplitude Modulation (AM) transmitter using PA-Base Modulation. It eliminated the need for a modulation transformer;....
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The ignition substitute provides a constant power source for the ignition coil. Its frequency, 0.5-1.0 kHz, is that used by an 8-cylinder engine with an idling speed of 650 RPM, and the unit provides a rapid spark at a 17% duty cycle, while staying within....
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Virtually all domestic and professional dimming systems are based on triacs. These devices will conduct once they have been fired, only while current flows in excess of the holding current of the device. These dimmers work very well with a resistive load....
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This tutorial details the construction of a simple and low cost robot. The robot is mainly a line follower but can also be used as a photovore, a photophobe, and obstacle avoider!And all this for less than 40$. The best part is that the robot does not use....
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Here is audiopreamp mic(dinamic). 200-600-ohm output impedance and low noise pre-amplifier for dynamic microphone is ideal for strengthening. This is a three-stage discrete amplifier with gain control. Alternatives such as the BC109C transistors, BC548....
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Analog to Digital Converter ADC interfacing with microcontrollers AVR 8051 PIC, Digital-Ramp ADC, Successive approximation ADC, Flash ADC and basic working of an anlalog to digital converter....
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This simple tone control can be used in may audio applications. It can be added to amplifers, used as a stand alone control module, or even built into new and exciting instruments. It's one IC construction makes it a very compact circuit, as only a few....
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A simple op amp and silicon diode are the heart of the temperature-to-voltage converter that will permit you to use an ordinary voltmeter-either analog or digital-to measure temperature. User adjustments make it possible for a reading of either 10 mV or 100....
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PCM Powercom was founded in 1987, a leading provider of power protection products with ISO 9001 certificate. There are over 2,600 employees around the world...
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This FM broadcast rf amplifier is built with 2SC2539 which is a silicon NPN epitaxal planar type transistor designed for RF power amplifiers in VHF band mo....
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This circuit is designed to make a short pull-up antenna perform like a long wire antenna, while offering no voltage gain...
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This Instructible is entered in the Category: 13 - 18 of the National Robotics Week Robot Contest...
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The above picture is audio logic level probe circuit, which is composed of voltage comparator, multivibrator, and piezoelectric ceramics HTD etc. The latter two constitute audio circuit and the audio frequency is used to assess the TTL or COMOS instrument s....
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The RF circuit is a C-Class power amplifier . it is used in last stage of transmitters .Its maximum power output is about 1 Watt . the circuit can be used in 3 frequency range 30-100-200MHz...
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It`s a quick hack on veroboard rather than a neat PCB, but here`s the schematic. Three outputs (TMS, TCK, TDI) run to the 74HC04 for buffering. The /RESET output drives a pull-down NPN transistor directly. Note that the 74HC04 is driven from an external Vcc....
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Martin ustek has modified the project to also include a Sokoban game. Some information about his version can be found dotted throughout this page; for full details, please visit his website (Czech). Either game can be selected with a menu that appears when....
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Voltmeter and Ammeter can be easily made using PIC Microcontroller having ADC (Analog to Digital Converter). I am using PIC16F877A and the result is displayed on an LCD Display. PIC16F877A is enough if you do this project only for testing purposes. I suggest....
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The schematic diagram below shows a simple trivial low-cost 12 volt DC 50W off-line SMPS switching power supply circuit. It can be used for DIY home projects or to learn operation of flyback converters. This PSU can work over a universal input AC line range....
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This Alarm can be used to protect your property, Inside or Outside.
And it can protect a Very Large area such as the complete perimeter of your yard.
Be Aware: There are some Possible Drawbacks: Snow or Fog could Block the Beam,
Giving a False Alarm...
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This is simple almost beyond belief for distortion devices. Two transistors, four resistors, three capacitors, and two controls make all that tone. The first transistor is set up with the simplest of arrangements - input through a DC blocking capacitor....
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Single chip 2.4 GHz Transceiver NRF24L01 is a single chip Radio transceiver for the world wide 2.4 - 2.5 GHz ISM band..
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The MAX2620 combines a low-noise Oscillator with two output Buffers in a low-cost, plastic surface-mount, ultra-small uMAX package. This device integrates functions typically achieved with discrete co....
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These novel relay driver circuits have the ability to pick up a relay with a coil voltage rating equal to double Vcc. After pickup, the relay armature is held via the application of Vcc. Under this condition, the coil power is reduced by the square of the....
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The first resistor on the left in the schematic says 68k. This will vary depending the the microphone. In our case we used a microphone from digikey with a 1. 5k output impedance, so we matched it with a 1. 5k resistor instead of using a 68k...
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The National Semiconductor LMV225 is a linear RF power meter IC in an SMD package. It can be used over the frequency range of 450 MHz to 2000 MHz and requires only four external components. The input coupling capacitor isolates the DC voltage of the IC from....
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Balanced cross tube inverter circuit is also known Chelles inverter circuit, it can be used as a preamp and 6N10,611 inverted. With the final amplifier tube amplifier using 300..
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Measurement of physiological parameters like heart rate and respiration rate is crucial in the field of medicine. Here is a simple method for respiration rate measurement using a displacement transducer. Its responds fast and is cost effective. By using....