Top Circuits Page 40
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Circuit as shown by the l2kHz the intermediate frequency oscillator, an alarm circuit. It uses variable feedback oscillation circuit, the oscillation frequency is mainly determ..
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Circuit is shown at the same time produce a square wave, triangle wave, sine wave and outputs, especially for electronics enthusiasts and students do with an oscilloscope to ob..
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Circuit shown in Figure select the best working conditions and a reasonable allocation of the temperature coefficient of resonant circuit components. Both ends of the resonance..
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Common non-sinusoidal oscillator circuit, waveform and frequency formula - pulse wave oscillator - blocking oscillator transformer ..
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Common non-sinusoidal oscillator circuit, waveform and frequency formula - pulse wave oscillator - single-junction transistor blocking oscillator ..
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Common non-sinusoidal oscillator circuit, waveform and frequency formula - sawtooth oscillator - use blocking oscillator ..
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Common non-sinusoidal oscillator circuit, waveform and frequency formula - sawtooth oscillator - use multivibrator ..
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This is an image Schematic. No Description available...
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This simple circuit can provide hours of enjoyment as you learn tunes, play duets or just make some really weird sounds by pushing all the buttons at once. You have probably seen this ciruit before, it is fairly common. I have seen it in several books. The....
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In this auto shut off tone generator project, once the switch to the 9V power supply is connected, the alarm will trigger at a frequency of approximately 1.27 kHz. It will remain ON for a duration of approximately 170 seconds or 2.8 minutes before it....
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As illustrated, 555 and R1, RP1, C1 and other components controlled audio oscillator, f frequency of 1.44/(R1 + 2RP1) C1, illustrated parameters between 600Hz ~ 20kHz, can be s..
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As illustrated, 555 and Rl, RPl, C1 controllable audio oscillator and other components, f 1.44/(R1 + 2RP1) C1, the parameters shown in the frequency between 600Hz ~ 20kHz, can ..
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This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least. Pushing P1 the device is switched-on feeding any appliance connected to SK1. Input audio signal is boosted and squared....
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This is an evaluation use of a small graphics LCD module. Last summer, SG12232C graphic LCD module has been sold sold for 1500 Yens from Akizuki Denshi and I bought it. However I could not find good application for the LCD module and it was going to go to....
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This device is a stereo amplifier for a high sensitivity stereo parabolic microphone. It can be used for listening to distant sounds. The Big-E can be used with headphones or as an audio source for a stereo tape recorder or a PC sound card. This circuit also....
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This project is an experiment of the Digital Signal Processing with a cheap microcontroller instead of an ordinary digital signal processor. Recent 8 bit microcontrollers have sufficient processing performance so that they can be used for simple audio signal....
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Elecret microphones have a small electret melement and FET amplifier built to same case. Electret microphones needs some power to operate. The power (typically 4-10V) is fed to microphone through resistor (typically 1-10 kohm). The electret microphone....
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This small amplifier was intended to be used in conjunction with an electric guitar to do some low power monitoring, mainly for practice, either via an incorporated small loudspeaker or headphones. The complete circuit, loudspeaker, batteries, input and....
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This mini audio amplifier will test the audio stages in amplifiers such as the front end of FM bugs. You can also use it on lots of our other projects as well as the output stages of radios. It is a very handy piece of test equipment and will make a perfect....
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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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I recently prototyped a Tube Screamer type circuit to refresh my memory about the sound of this pedal. I used a borrowed TS-808 and a Pro Reverb in the mid 80s for several weeks while my modded Twin Reverb was being fixed and I remembered it sounding pretty....
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After attempting to use this reportedly "pretty good" microphone in a variety of situations with some "pretty bad" results, I dissected the power supply and found the same audio transformer that`s in their 180-in-one project kits! This DAT-Heads Digest....
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This circuit is useful for removing ground loop hum on a remote line level audio signal line. It can be used to to connect a computer sound card to a stereo amplifier`s line input. Other uses include tapping into a line level signal for powering a remote....
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Not so much a real project as a field day for experimenters, this article describes the methods you can use to tailor an amplifier to a specific driver. Much is empirical (i.e. design by experiment, trial and error), and although formulae are possible, the....
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Using this circuit will give Good Charging results to the Gell Cell Battery
used in the Metal Detector, or any other simular and smaller type battery.
This charger is both Current and Voltage Regulated...
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The waveforms in Figure 1 illustrate good and bad power-factor conditions. Trace A, at the top of the figure, is the voltage common to the current waveforms below. Trace B is an ideal current, in phase, with a 1.0 power factor and delivering peak current of....
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A muscle-powered capacitor charger contains only a few components: a storage capacitor, a bridge rectifier, and a voltage-limiting zener diode that protects the capacitor from excessive voltages (Figure 1)...
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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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This converter also requires either a transformer or two inductors in place of the single inductor that most dc/dc converters require. You might overlook an alternative approach because the converter uses a linear regulator and takes an efficiency hit when....
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The above circuit can be useful to detect if the load of any battery charger or plug-in adaptor supply is not properly connected. The load can be a set of batteries to be charged or any other type of battery or low dc voltage operated device...
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This almost trivial circuit may be used to charge a pair of AA or AAA sized rechargeable battery cells from sunlight. The circuit has been used to keep a Palm Pilot and walkman radio running perpetually. This is an unregulated charger, proper charging is....
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In Figure 1, an MC34063A switching regulator and an MC33342 NiMH battery-charger IC combine to generate from an unregulated power supply a 600-mA battery charger for one to four NiMH cells...
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Figure 1 is a generalized block diagram of a multichemistry battery charger. A COP8ACC5 µC handles its key charging features. The µC is available in a 20-pin (15 I/O pins) SOIC or a 28-pin (23 I/O pins) SOIC/DIP. It contains 4 kbits of internal ROM...
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The circuit in Figure 1 can solve this problem by providing a constant 300-mV drop between VIN and VOUT at currents as high as 3A. The accuracy of the 300-mV drop is nearly as good as the accuracy of the input voltage, which in this case is approximately 1%.....
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When a discharged gel cell is connected, the charger goes into a fast charge mode at a fixed rate of 400 ma. After the chip detects the voltage leveling off or when 4 1/2 hours has elapsed. (which ever happens first.) the fast charge will stop. After the....
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A simple circuit measures the open-circuit voltage, such as the expanded-scale voltmeter circuit in Figure 2, which follows the curve in Figure 1.
Sealed lead-acid batteries are available in several sizes, from a single D size (2.5 Ahr) to multicell....
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This charger will quickly and easily charge most any lead acid battery. The charger delivers full current until the current drawn by the battery falls to 150 mA. At this time, a lower voltage is applied to finish off and keep from over charging. When the....
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This project is one for the experimenter, but as shown will work extremely well. The sensing circuit can be made so sensitive that a load of only 2.5mA is enough for the circuit to detect, and disconnect the charger.
The idea is that the charger is left....
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One application is where you need a Higher Power Zener, Possibly even a 100 watt rating.
Another useful application is as a Shunt Regulator for Solar Cells that are used
to charge "Lead Acid Batteries". Simply Place it in parallel with the Solar Cell....
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This circuit was specifically designed to recharge alkaline cells. The unusual connection of the transistor in each charging unit will cause it to oscillate, on and off, thus transferring the charge accumulated in the capacitor to the cell. The orange LED....
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Here`s how to make a good charger for a sealed lead-acid battery (this will NOT work with NiCad batteries) that`s faster (because it allows more current into the battery initially) and safer (because it uses lower voltage when the charging is finished). The....
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This circuit is for a temperature controlled constant current battery charger. It works with NICD, NIMH, and other rechargeable cells. The circuit works on the principle that most rechargeable batteries show an increase in temperature when the cells becomes....
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This simple charger uses a single transistor as a constant current source. The voltage across
the pair of 1N4148 diodes biases the base of the BD140 medium power transistor. The base-
emitter voltage of the transistor and the forward voltage drop across....
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The driver circuit (see the complete schematic) has 4 main sections:
* the voltage definition,
* the integrator,
* the current booster, and
* the foldover. The schematic is drawn so that higher voltages are toward the top and lower....
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This application note presents practical design considerations
for battery chargers employing Green Mode FPS
(Fairchild Power Switch). It includes designing the
transformer and output filter, selecting the components and
implementing constant current /....
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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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Rechargeable lithium-ion batteries are rapidly becoming
the battery of choice for many battery-powered products.
These products include notebook computers, PDAs, video
camcorders, digital cameras, cellular phones, portable
test equipment and others.....
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Li-Ion batteries are normally charged with a current
limited constant voltage for a fixed length of time. At the
end of this time period, the voltage must be removed to
prevent internal chemistry changes in the battery. At a
minimum, a timer is needed to....
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Linear battery chargers are typically smaller, simpler and
less expensive than their switcher-based counter parts,
but they have one major disadvantage: excessive power
dissipation when the input voltage is high and the battery
voltage is low (discharged....
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The LT®1510 current mode PWM battery charger is the
simplest, most efficient solution for fast charging modern
rechargeable batteries including lithium-ion (Li-Ion), nickelmetal-
hydride (NiMH) and nickel-cadmium (NiCd) that
require constant current....
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The new LTC1155 Dual Power MOSFET Driver delivers
12V of gate drive to two N-channel power MOSFETs
when powered from a 5V supply with no external
components required. This ability, coupled with its
micropower current demands and protection features,....
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The charger is built around a single LTC®1541,
which contains a voltage reference, op amp and comparator.
The high accuracy voltage reference (±0.4%) regulates
the battery float voltage to ±1.2%, as required by most
Lithium-Ion battery manufacturers...
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The block diagram in Figure 1 shows the basic functions
performed by a battery charger IC using this patented
topology*. The LT1511 is a high efficiency 200kHz switching
regulator IC in a step-down configuration suitable for
charging lithium-ion....
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Typically such applications
require low power from the battery. With this in mind,
every feature of the LTC4100 Smart Battery charger exists
to reduce board real estate and profile requirements. The
LTC4100 is a Level 2 (slave) Smart Battery charger that....
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The LTC®4010 and LTC4011 are NiCd/NiMH battery
chargers that simplify Nickel-based battery charger
design and include power control and charge termination
for fast charging up to 16 series-connected cells using a
synchronous buck topology. The LTC4011....
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The LTC1980 manages both battery charging and
generaton of the regulated system bus voltage via a unique
bidirectional pulse-width modulator design (Figure 3).
When the wall adapter is present, power passes directly to
the system load DC/DC converters....
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The circuit is capable of supplying either a trickle (50 mA) or high-current (1-A) charge. You can select either charging method or an automatic mode that will first trickle charge a battery if it is particularly low before switching to
high-current charging...
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Charge current: I=0,45V/R2
Power-dissipation by R2: (0,45 * 0,45 / R2) !
Please adjust 13,8V by R5 without connected battery...
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Cost-effective nickel-cadmium battery charger LM393 constructed as shown, it has the following characteristics: (1) constant current charging interspersed with large current di..
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The above pictured schematic diagram is just a standard constant current model with a added current limiter, consisting of Q1, R1, and R4. The moment too much current is flowing biases Q1 and drops the output voltage. The output voltage is: 1.2 x....
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Charging current is about 100+mA, which is the internally-limited maximum current of the LP2951. For those wondering, this is compatible with just about any single-cell li-ion battery since li-ion can generally accept a charging current of up to about 1c....
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The circuit described here provides around 180mA current at 5.6V and protects the mobile phone from unexpected voltage fluctuations that develop on the mains line. So the charger can be left ?on? over night to replenish the battery charge. The circuit....
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The above circuit is a precision voltage source, and contains a temperature sensor with a negative temperature co?ficient. Meaning, whenever the surrounding or battery temperature increases the voltage will automatically decrease. Temperature co?ficient for....
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The charger is build around a LM317 (click to download datasheet) adjustable regulator.
The charge starts when a battery is connected between pins JP1-JP4 or JP2-JP4 or JP3-JP4. For example, if a battery is connected to JP1-JP4 pins then the current that....
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This circuit was created for digital cameras. It's known the digital cameras have considerable power consumption. For example my camera Minolta E223 requires approximately 800 mA. In practice a mains power supply or high capacity NiMH accumulators....
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Lithium Ion batteries pack a lot of power by weight compared to other types. There are 2 things that need to be handled differently than nicad on NiMH. They cannot be used as a direct substitute (even if they look like other AA's) since they run at about....
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This device is built around a PIC12F675 (a dandy little part from Microchip). The number of cells (1 to 8) is programmed in using the one button. The cell count is saved in EEPROM the next time you power up the device. Using just one button for all....
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Note first the battery to be treated at the center of the figure. It is connected to contacts of a relay. The diagram shows the relay at rest. Under these conditions the battery is in SHOCK . His pole - is grounded and its positive pole to the circuit of....
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In perfect discharge the batteries of lead acid, exists the fear they are destroyed. This circuit makes the work, this detection of discharge, protecting the batteries from destruction. At the discharge the polar voltage of batteries 12V of Lead acid, is not....
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This simple circuit will find many applications as a battery eliminator for low power requirements. It consists of a transformer, a bridge rectifier and an electrolytic capacitor followed by a zener controlled series pass transistor. The output is stabilized....
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I Specifically Designed this circuit to charge 2 Batteries for my Digital Cameras, but it can be modified to charge 3, 4, 5 or more cell. However, It will Not Work with only One Cell as that voltage is too low for even this LDR Discharge Regulator. If you....
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Using this circuit will give Good Charging results to a Sealed Lead Acid Battery, like I use in the Metal Detector. This Circuit is Extremely Small in size and has a low parts count, making it ideal in some situations. It can also be adapted for Charging....
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The above pictured schematic diagram is just a standard constant current model with a added current limiter, consisting
of Q1, R1, and R4. The moment too much current is flowing biases Q1 and drops the output voltage. The output voltage is: 1.2 x....
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This simple circuit makes it posible to monitor the charging process to a higher level. If you need more information then check out the LM3914 Datasheet. Final adjustsments are simple and the only thing needed is a digital voltmeter for the necessary....
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This high-performance circuit first quickly starts (and holds) the charge at 2 amp, but as the voltage rises the current will consequently decrease. When the current falls below 150mA, the charger automatically switches to a lower 'Float' voltage to prevent....
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The circuit is actually a half-wave rectifier. It only charges the battery on every half cycle. The plug pack doesn't like this as it leaves residual flux in the core of the transformer and causes it to overheat. But that's the only drawback with the....
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This circuit will charge a 12v battery (10 NiMH cells) @ approx 220mA.
It is a very simple circuit but requires correct setting up.
The circuit is designed around a 12vDC, 500mA plug pack. This type of plug pack delivers about 17.5v to 18.5v DC on....
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A battery is a vital element of any battery-backed system. In many cases the battery is more expensive than the system it is backing up. Hence we need to adopt all practical measures to conserve battery life.
As per manufacturer's data sheets, a 12V....
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Here is a deluxe version of the simple charge rate limiter, using the same idea but with the ability to charge two packs simultaneously from a single wall charger. For circuit description and parts list, see the simple charger page. Since wall chargers....
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The charger consists of two stages: The first is a capacitive voltage doubler, which uses a 555 timer IC driving a pair of transistors connected as emitter followers, which in turn drive the voltage doubler proper. The doubler has power resistors built in,....
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Here we use the PIC16711. Rechargeable battery capacity is rated in mAH (milliampere-hours). The total capacity of a battery is defined as "C", that is it can supply C mA for 1 hour, or 2C for 30 minutes etc. Charge rates can vary from trickle charges to....
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Leaving aside the complex chargers, "stuffed" electronics capacitor charger is one of the best connections. Charging current is limited by the resistor (or other element of the changing excess energy into heat), but the reactance of the capacitor to the....
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Build-in charger for instruments powered by single lithium-ion or Li-Pol accumulator. If external power supply not conected to charger, current back from the accu charger is very small. New version improved temperature stability and Not Needed NTC....
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The rechargeable Li-ion, I began to intensely interested last summer, when I managed to bring a holiday without a phone charger. After several experiments involving originated in Figure 1, which has proved. Involvement of the stage provides a limited current....
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If you use different batteries with actual capacity, with different self-discharge rate of batteries from different manufacturers, you will perhaps throw further described charger. Because each cell can be discharged separately recharge, can be charged with....
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Most universal chargers to charge the battery 9 V (8.4 V more). However, while the charging of NiCd or NiMH rechargeable governed by a special circuit or a microprocessor, 9 V batteries are recharged mostly from current sources. I use several of these....
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The circuit is shown in Figs. 1-2 and tested succesfully. This is a 555 timer IC based charger. The circuit is operated by 8.4VDC. For R1=2.7K, R2=3.3K, and C1=10nF, oscillation frequency is about 25KHz. Measured period is about 40µs when there is no toroid....
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Fast and efficient charging is higher than conventional charging ten times to several times the current charge. When the battery voltage rises to a predetermined value when (va..
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Fast charging circuit (TEA1102) Shown is a chemical for a variety of battery fast charging circuit, which is based on fast charge controller TEA1102 nuclear charging circuit of..
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Fast charging circuit It shows voltage and current waveforms and fast charge circuit configuration of the charger. Detection and control circuit of the circuit is composed of t..
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10 hours using the constant current charging, use more convenient, the circuit shown in FIG. Electricity through the secondary transformer T stepped down, all the way from the ..
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Efficient nickel-cadmium battery charger IC (LTC1148) circuit ..
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Days to TN-1 Intelligent negative pulse charging circuit Is a day to TN-I intelligent negative pulse charging circuit. This charger is the main part of the typical half-bridge ..
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The first circuit of nickel-cadmium battery discharge before recharging to eliminate the "memory..
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Charging circuit will rise, especially rechargeable batteries and the charging circuit when a large current charging a higher temperature. LTC4060 external..
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This circuit can be used for large current after use nickel-cadmium batteries, rechargeable batteries, but also as a general low-voltage DC power supply. This circuit by the charging section and the dc output parts. K2 is the fast charge, slow charge selector ..
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A universal rechargeable lithium battery circuit design, applicable to different battery types and number of batteries. This is because both the charger output voltage or curre..
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Adjustment potentiometer RP, can change the charging current. ..
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Adjustment potentiometer RP, can change the charging current. ..
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Adjustment potentiometer RP, can change the size of the DC output voltage. ..