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This circuit can be used to operate an electric strike or an electromagnetic lock on a door. It is not the door being opened/closed, but a small electromagnetic strike which unlocks the door. The opener has the following features currently programmed in....
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As shown, the circuit consists of a dual-core 556 and the light emitting tube. The left half of the IC (556 1/2) composition R1, R2, C1, etc. frequency of about 2Hz multivibrat..
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The electrical circuit diagram of this temperature control circuit consists 3-pin analog temperature sensor (LM35DZ), a built-in A/D converter microcontroller (PIC16F877), and the heater driver (IRL1004)..
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The circuit tests whether or not a diode is open, shorted, or functioning correctly. If lamp A lights, the diode under test is functional. When lamp B is lit, the diode is good but connected backwards..
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A practical amplifier circuit An electronic amplifier is a device for increasing the power of a signal. It does this by taking energy from a power supply and controlling the output to match the input signal shape but with a larger amplitude....
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Variable AC Power Supply Circuit. In electronics, it is often handy to have a fully isolated variable AC power supply. With such a device you can safely test various AC powered circuits and...
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This is class D audio amplifier circuit that is used to control PWM motor speed. This circuit has two advantages for battery-powered portable devices. First,....
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The basis for this amplifier has been around now for several years as Project 3A, and requires only relatively small modifications to be able to operate in Class-A. The biggest change is in output power (reduced dramatically from the 60-100W of the Class-AB....
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This is my own version of the classic PIC 16C84/16F84 programmer. The design is originally by David Tait. I`ve made a few changes, redrawn the schematic and done a board layout. All the files you will need are linked below, including software you`ll need to....
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Class A power amplifier distortion, although low, but its low efficiency and output power is small, so people designed B power amplifier circuit. B amplifier circuit is to work..
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Depending on the input impedance can be divided into a high-impedance input and low impedance input in two ways. Its major input in various audio equipment to the requirements ..
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Circuit works: At present, although the most commonly used method is to pulse width modulation speed, but the circuit is a pulse position modulation (when known as pulse modulation). ..
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This watt-meter circuit has measurement range up to 1-KW. This circuit can give the complete (X)(Y) function although uses only one transistor. Actually, this circuit is used for 117 Vac ±50 Vac operation. For lower or lower voltage, this circuit can be....
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The LT6552 is a video difference amplifier optimized for low voltage single supply operation. The LT6552 features 75MHz 3dB bandwidth, 600V/ µs slew rate, and ±70mA output current making it ideal for driving cables directly. This circuit maps the sync on Y....
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A DIY kinetic energy harvester and wish to use the electromagnetic method to generate electricity. So far I know the following materials that I`m going to use:..
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The circuit in Figure 1 is a quasi-linear regulator. It functions as a source follower for input voltages greater than a preset level, determined by VR3. For input voltages lower than the preset level, the pass element, Q2, operates as a saturated switch.....
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Inserting two 1-MO resistors, R1 and R2, in the output stage of one of the circuit"s inverters limits the current needed by the oscillator tone more than a few pA. This circuit includes a CD4007 package, which has three CMOS inverters. It forms a standard....
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AT89C2051 Digital Visitor Counter. The microcontroller do the above job it receives the signals from the sensors....
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This simple circuit allows a 12V battery pack to be charged via a bike generator. The generator is rated at 3W and with this voltage multiplier circuit provides about 200mA at about 15km/h. A 12V system was chosen because it allows the use of a car horn (get....
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With the component values shown the circuit is designed to have and output voltage range of approximately 1.25 to 13.5 Volts when measured at the output of the....
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As shown in FIG simple audio amplifier circuit. Using the integrated op-amp configuration of audio amplifier is stable, easy to negative feedback, so it is easy to get equaliza..
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The IH5352 is a quad SPST, CMOS monolithic switch which uses a Series/Shunt (T switch) configuration to obtain high OFF isolation while maintaining good frequency response in the ON condition. Construction of remote and portable video equipment with....
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The battery should charge up to 14 volts. A reading of 10. 7 volts indicates that one cell is shorted. A good way to diagnose this further is to look at the water level in the cells. The shorted cell will bubble more vigorously and lose water faster than the....
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This is a simple RF receiver mainly for low-distance digital radio receiver application. The analog output of this circuit should be connected to a schmitt-trigger signal conditioning circuit with a proper value capacitor (from collector of T3). L1 for 27Mhz....
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Programmed Signetics 8223 256-bit PROM is used as alphameric display having five 7-segment digits connected to form alphameric simulation of abbreviations for second, millisecond, microsecond, hertz, kilohertz, and megahertz as SEC, SEC-3, SEC-6, H2, H2 3,....
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This circuit draws only 4 mA from a 5-V supply while driving a standard RS-232C receiver. The system clock drives a de-de converter that produces -3.4 V. The frequency can range from 0.5 to 8 MHz, but a range of 0.5 to 1 MHz will minimize power....
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This PIC16F877 microcontroller tutorial answers the question, ""How to interface LCD in 4bit mode with PIC16F877"" ? Also, using PIC16 simulator (Proteus) y....
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This ion detector circuit detects static charges and free ions in the air. This ion detector circuit can be used for detecting presence of free ions, static electricity or high voltage leakage. Antenna used in this project is a short whip antenna and the R3....
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The MP3 player is a new kind of portable audio player. It will be shipped simultaneously from many audio makers in the early part of 2000, and will start a new generation of portable audio. I have omitted a general description of the MP3 player and format....
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This circuit is designed to digitally increase/decrease the volume of an analog audio signal. It uses a single AVR microcontroller to produce the controlling pulse width modulated (PWM) signal. However, the circuit`s innovation is the use of the....
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For use with low-power transmitters with a positive keying voltage. Q1/Q2/Q3 form a switching amplifier. When the key is pressed, the collector of Q3 goes to ground, tuming on Q5 and activating IC1, an audio oscillator. Q4 drives the speaker. For use as a....
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The type C system was first installed about 1925 and has been very extensively used. It incorporates the most desirable features of the systems just considered. Like the type A system, the carrier is suppressed, and hence the effect of line attenuation is....
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The circuit"s frequency oscillation is /=2.8/ [Cix(/i + i2)]· Using the values shown, the output frequency can be varie..
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Burst Mode operation maintains high efficiency at light loads by reducing IC quiescent current to 120 A. Light load efficiency is also improved with the reverse inductor current inhibit function which supports discontinuous operation. Additional features....
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The schematic for this project is actually deceivingly simple compared to the complexity of what is happening in the circuit. So take a look below or click to view the full sized schematic. The two signals we`ve just generated are mixed together at the base....
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Touching eight-sound five-flash dynamic toy circuit diagram is shown in the diagram. It consists of HFC3018 module, and it can generate eight kinds ofdifferent voices: like step gunfire, aviation gunfire, game sight, telephone sight, bomb 1, bomb 2 sound,....
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Requiring only two ICs to monitor a train of positive pulses, this circuit produces a single positive output pulse for each input pulse whose duration is either too long or too short. You specify the minimum and maximum limits by adjusting the trimming....
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The standard circuit will display directly in Hz (1MHz max), and there is a seperate on board divider that will allow you to display directly in KHz (approx 40MHz max). Becuase the display reads directly in Hz or KHz there is no need for decimal point....
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The board has been initially developed to learn with CAN, so a CAN transceiver is available (IC4). The CAN transceiver comes from Maxim, but some other manufacturers provide some compatible CAN transceivers which can be used. An RS232 transceiver is also....
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The circuit shows TL494 Pulse Width Modulated Step?Down Converter Circuit Schematic. With this circuit you can have circuit test such Line Regulation, Load Regulation, Output Ripple, Short Circuit Current and Efficiency test with various Vin conditions.....
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This circuit generates a two-tone effect very much alike the cuckoo song. It can be used for door-bells or other purposes thanks to a built-in audio amplifier and loudspeaker. Used as a sound effect generator it can be connected to external amplifiers, tape....
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Leo Esaki invented the tunnel diode in 1957 while working at Sony (Tokyo Tsushin Kogyo at the time). Tunnel diodes have a very narrow, heavily doped p n junction only around 10nm (100 G…) wide that exhibits a broken bandgap, where conduction band electrons....
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yeah, you really need some current limiting. i use open frame linear supplies for charging batteries, and set the current limit at the recommended charging current of the battery (foldback current limiting is very useful), but then again, i have a few of....
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CN3052A/CN3052B/CN3056 the high-performance linear lithium battery charge manages the chip. Integrate power tube within these devices, do not need sense resistor and choked flow diode of external electric current, only need few peripheral components and....
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You can use a multimeter with capacitance-measurement capability to measure the length of wire or cable to an open circuit. The capacitance of a pair of wires (or a wire to a shield) is directly proportional to the length of the wire. If you know the....
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In supply section after bridge rectifier and smoothing capacitor is used common voltage regulator LM317, which has with R1 and R2 adjusted output voltage about 8V. Supply line goes through inductor to DAC chip for theoretically lower HF interference which....
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This is a CMOS-compatible (and hopefully also TTL) input featuring over- and under-volatage protection. Schmitt triggers are used to allow for input with long transition times. Verified to work up to 30MHz...
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Have you ever been using the modem or fax and someone else picks up the phone, breaking the connection Well, this simple circuit should put an end to that. It signals that the phone is in use by lighting a red LED. When the phone is not in use, a green LED....
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As already explained, a monostable multivibrator (MMV) has one stable state and one quasi-stable state. The circuit remains in its stable state till an external triggering pulse causes a transition to the quasi-stable state. The circuit comes back to its....This IC is a wideband RGB Video Amplifier with DC control developed for monitors. It includes three matched video amps, a differential input Comparator for brightness adjustment, and three matched DC ....The LED predriver output pulses an external transistor which in turn, switches on the infrared light emitting diode at a very low duty cycle. The desired IR LED pulse period is determined by the value of the external timing resistor. The Smoke Sensitivity is....The device will be placed on the back wheel of the bicycle. Since the LED`s and other components run off of a lithium-ion battery, it stands independently, attached to the spokes of the rear wheel. In the design, all components are placed on the spokes of....Detailed discussion of how to add current limit or foldback current limit to the linear regulator controllers of the MAX1864. Can be used with other discrete regulator designs such as in MAX1865, MAX1964, MAX1965, MAX8513, and MAX8514. Shows tested c....DAC is short for Digital to Analog Converter. In this article we play around the code Michael Smith created for a PWM based DAC. I modified his code so that other DAC options could be tried. I compare the 8-Bit PWM DAC with the R2R DAC at various numbers of....This intelligent electronic lock circuit is built using transistors only. To open this electronic lock, one has to press tactile switches S1 through S4 sequentially. For deception you may annotate these switches with different numbers on the control....A 2008 USA Nissan Pathfinder (5N1AR18B28C628086). I live in Toronto, Ontario Canada. One of the many feature my pathfinder has is a power assisted mechanism to close the lift gate (trunk, rear door). About 2 moths ago the above noted mechanisms stop....Band-stop filter (BEF) integrated operational amplifier, such electrical road performance and a bandpass filter contrary, that in a certain band, the signal can not be (or has ..The 555 on the right is wired as an alarm sound generator and the second 555 timer on the left is a 1 Hz astable multivibrator. The output of the left timer is to modulate the frequency of the right timer. This process will cause the right timers frequency....The following circuit shows about LM317T IC Fir Solar Battery Charger Circuit Diagram. Features: Simple circuit, for AA and AAA rechargeable ....This is the circuit diagram. It is essentially a DC-DC converter, and a PIC 16F84 (or PIC 16F88) to drive it. Sw1 is a test switch - push it to caus....Does anyone know where I can get a schematic for a USB to SPDIF converter, like the ones from empirical audio. Thanks!!! I like their concept but $500 ....The basic functions of this drive are to give smooth start to motor change the direction, change the speed etc. Here I am demonstrating one such application of DC drive that will control speed and direction of a DC motor using standard TV remote control. All....This circuit runs a fast battery test without the need of power supply or expensive moving-coil voltmeters. It has two ranges: when SW1 is set as shown in the circuit diagram, the device can test 3V to 15V batteries. When SW1 is switched to the other....Most amps acoustic frequencies that make our readers, instead of a transformer power, sometimes required two or sometimes three. This tactic is more common in amplifiers 'High-End', where the altar of high fidelity are all eager to sacrifice their economies.....Capacitors C2, C3, diode VD2, VD3 and other components simple capacitive half-wave rectifier buck power supply, the entire supply control circuit of electricity, the power supp..The design incorporates 30-0, 1/4;.. microstrip lines on the input and output. C3, C4, C7, and C8, along with Ll, form a pi network that matches the low-input impedance of the device to 50 0. C5, C6, C9, ClO, and 30-0 transmission line L2 form an output pi....A discrete transistors by the current control circuit diagram of the way ..This is very stable, harmonic free, long range fm transmitter circuit which can be used for fm frequencies between 88 and 108 MHz. This can cover 5km range (long distance). It has a very stable oscillator because you use LM7809 stabilizer which is a 9V....In this section,one of the most useful Integrated Circuits or IC, more commonly known as the 555 Timer chip will be discussed. It should be noted that IC`s....This diagram will give you a simplistic idea of how it all works, as you can see the only time left and right come together from the indicator switch is from the stalk to the hazard switch, so get the steering column off too and go all the way from the....A simple photo switch circuit using NE 555 IC with diagram and schematic.This photo switch ons a relay when light intensity crosses limit.A light sensor circuit for home and industrial purpose..A very simple 10 LED roulette wheel circuit is shown here. pressing the button starts the LEDs in a rotational motion (sequencing) at full swing initially, and gradually slows down, until it stops to a particular, randomly selected LED. The randomness of the....This class A preamplifier has been designed in a symmetrical structure. In the input differential stages we`ve used the dual transistors T1 and T2. Polarisation correction is essential because of the amplification differences and is assured with T12. P2....The Data Recorder (A3007) is a LWDAQ Device that decodes and recordes subcutaneous transmitter ( SCT ) messagess. The A3007 takes the signal generated by a demodulator such as the Demodulating Amplifier ( A3017 ) and determines when this signal contains a....This inverter is very easy to construct, reliable, and even powerful enough to light up a 15W florescent tube (if you cool your transistor well). The only hard-to-find piece of this baby is the so-called yellow inverter transformer. It's a miniature high....It is ADC0804 to be left-handed, it is 74HC573 latch to be right hand, the latch connected the one-chip computer and has not drawn at the same time. The pin CSAD of ADC0804 is a chip selection pin because acted as effectively by the low level Hand over 0....This is a very useful RF attenuator circuit which works from 300KHz to the 3GHz range based on the quad PIN diode array HSMP-3816 from Avego. The lower PIN diodes are biased at 1mA which gives about a 40 to 70 ohm impedance. R5 can be increased to increase....This is a design circuit for digital voltmeter circuit. The integrated circuit ICL7107 is a 3-1/2 digit LED A/D convertor. It contains an internal voltage reference, high isolation analog switches, sequential control logic, and the display drivers. The....The particular circuit is substantially a generator of accidental numbers, from 1 until the 6. The clue him we see in a line from led, that each one corresponds also in a number from the 1-6, if push and leave, the S1 (push button). This movement corresponds....