12v switching power supply circuit works

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Switching Power Supply- 12V 5A Switching Power Supply, View Switching Power Supply, Product Details from SE GLOBAL TECHNOLOGY SDN.
This is a circuit 3V to 15V Step-Up DC Converter by LT1073.It is very nice IC Dc converter or Switching power supply. This circuit will double almost any DC input voltage as well as handling plenty of current. White-LED backlights are gaining acceptance because they offer higher reliability and simpler drive circuitry than those based on CCFL and EL technology. A flyback converter implements a current-limited power supply to charge lead-acid batteries. In conventional applications, switching-regulator ICs regulate VOUT by controlling the current through an external inductor.
By configuring a charge-pump voltage doubler as a tripler, you can readily derive 15V from 5V (Figure 1).
This is a small 2*25 (actually, 2*50) WPC amplifier with 3-order crossover stage (configurable as LP or HP). This circuit flips between two states: ‘charging’ the coil with current, and dumping this current into the output capacitor. One of the main features of the regulated power supply circuit being presented is that though fixed-voltage regulator LM7805 is used in the circuit, its output voltage is variable. Uses the MAX641 switching controller and an external discrete charge pump to step up the input voltage.
Another power supply that can be used for the Geiger-Muller tube variant of the cosmic ray muon detector. You’ll need a variable high-voltage supply to operate the detector.The transformer is uncritical and easy to build.
The LM2695 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying 1.25A to the load.
As it is, my circuit is small enough to fall off the desk and be lost among the crud on the floor. For example, replacing that inductor with a transformer and arranging things so that the bulk of the power and voltage is handled by a second hefty transistor and diode can make this little circuit control a power supply operating off the rectified mains. In order to step up the voltage output from four rechargeable AA batteries from around 5 Volts to the required 12 Volts the following circuit is used. Here is a very simple circuit that will provide high voltage (15-40kV) sparks using a common ignition coil.
The LM2574 series of regulator are monolithic integrated circuits that provide all the active functions for a step down (buck) switching regulator, capable of driving a 0.5A load with excellent line and load regulation. Detail from source:This is a simple low-cost 50W off-line switching power supply, which can be used for home projects or to learn operation of flyback converters. The LM2587 series of regulators are monolithic integrated circuits specifically designed for flyback, step-up (boost), and forward converter applications.
The selected switching topology is called a “push-pull” converter, because the transformer has a double primary (or a “centre-tapped” one, if your prefer).
These MOSFETs should be fast, able to withstand high currents (in excess of 30A each if possible) and have the lowest possible Rds(on). Although the schematics show a previous bipolar push-pull stage, you can also connect the gate resistor directly to the output of the controlling IC, leaving out the transistors, as the SG3525 is capable to drive up to 500 mA (theoretically), more than enough to switch the MOSFETs fast.
Build your own Accurate LC Meter (Capacitance Inductance Meter) and start making your own coils and inductors.
1Hz - 2MHz XR2206 Function Generator produces high quality sine, square and triangle waveforms of high-stability and accuracy. Having the ability to control various appliances inside or outside of your house wirelessly is a huge convenience, and can make your life much easier and fun. The "off" amount and percentage simply signifies the calculated difference between the seller-provided original price for the item and the seller's current discounted price.
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Import charges previously quoted are subject to change if you increase your maximum bid amount. If you require further details regarding the transaction data, please contact the supplier directly. One I can think of would be to get the 28V for the ADC connector on Gigabit Ethernet and later Power Macintosh G4s from the +12V on a standard PC ATX power supply.
As a result, the white-LED backlight is increasingly common in PDAs, cell-phones, digital cameras, and other portable devices. The MAX773 current-mode controller limits the output current and the flyback transformer provides isolation and flexibility for input voltages both above and below the battery voltage. The IC in Figure 1, however, driving a diode-capacitor network in place of the inductor, offers comparable performance for small loads. Construction is not critical, and the schematic is shown in Figure 1 below.Rectifier diodes should be ultrafast (UF4004 or similar), or you can use 1N4148 signal diodes.
A 15V rail is useful for powering op amps, LCD-bias circuits, and other low-current applications.

One of the requirements of the design is that it have a solar-powered supply with rechargeable batteries. The circuit is a step-up converter, and it’s workings can be explained by the main property of a coil: its inductance.
The frequency at which this happens is so high that only a small ripple remains at the output capacitor (10000uF). It contains a 1.25V reference, comparator, gating, output transistor, flyback diode and an uncommitted operational amplifier, which is not used here, and draws very little power. There is no special reason to use PNP transistors; I used them simply because I had a box full of them around. This is achieved by connecting a potentiometer between common terminal of regulator IC and ground.
This circuit can service low loads and is efficient when the output is two, three, four times the input voltage.
For Car PSU use IC UC3843 and mosfet IRFZ44N.It is nice circuit for electronics PC MP3 Player. The +12v car ignition signal should also be conditioned so it’s suitable for a 5v input on a CPU and made available, the standby current is around 30mA, which I hope is low enough.
In a series of experiments I loaded the transformer directly with a variable resistor (no rectifier used), measured the AC voltage across this resistor, measured the DC current into the transformer, and varied the drive frequency. I had to get a modern P channel MOSFET from Texas Instruments because old hard drive boards were seriously deficient in this one critical component. I feel an increase in efficiency to 90% would be wonderful, but three points less is good enough.
It can work over a universal AC line input range 90-264 VAC and provides a 12VDC output at more then 4A load.
The centre tap is permanently connected to the car battery (via an LC filter to avoid creating peaks in the battery lines, which could affect other electronic equipment in the car).
The proposed On-Semiconductor?s MTP75N06 can withstand 75Amp and has a Rds(on) below 10 milliohm. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils and inductors. The meter is a perfect addition to any power supply, battery chargers and other electronic projects where voltage and current must be monitored.
It is a very useful bench test equipment for testing and finding out the frequency of various devices with unknown frequency such as oscillators, radio receivers, transmitters, function generators, crystals, etc. BA1404 HI-FI Stereo FM Transmitter broadcasts high quality stereo signal in 88MHz - 108MHz FM band. It is an irreplaceable tool for troubleshooting and repairing electronic equipment by determining performance and health of electrolytic capacitors.
8-DIP machined IC socket allows to swap OPA2134 with many other dual opamp chips such as OPA2132, OPA2227, OPA2228, dual OPA132, OPA627, etc.
It's breadboard compatible so it can be plugged into a breadboard for quick prototyping, and it has VCC & GND power pins available on both sides of PCB. If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable.
A design in which the display is backlit (or frontlit) for extended periods needs an efficient circuit that drives the LEDs with a controlled current, and eliminates the wasted power associated with current-limiting resistors. The MAX471 current-sense amplifier monitors the charging current and feeds back to a threshold detector so that below a designed threshold the flyback converter can switch to a lower charging voltage for trickle-charge mode. The current threshold is typically 0.01C, where C refers to the battery capacity, which is specified in ampere-hours. Made of readily available components, the network can double, tripple or quadruple the input voltage.
When the internal switch in the LT1170 goes off, the inductor is placed in series with the 12 volts, adding to it. Losses will be slightly higher if you use signal diodes, or lower if you wanted to go to the trouble of using Schottky diodes – the latter are not warranted in such a simple circuit (IMO).
Since the power FET’s drains are not tied to ground anymore, it needs another transformer to drive gates.
This design is based on a photovoltaic array available from Radio Shack called a BatterySAVER (part number 980-1045).
As the internal transistor and diode are good only for 1A maximum, I had to use external parts instead. You may well turn over the design to use NPN transistors.The 2SC945 is a bias switch for startup.
For every 100-ohm increment in the in-circuit value of the resistance of potentiometer VR1, the output voltage increases by 1 volt. I looked for a frequency where the output voltage was highest and the input current was lowest.
This circuit uses a 555 timer IC to pulse a 2N2222 with square wave at a frequency that is set by the capacitor and the potentiometers.
I use IC 555 ( hot ic Timer) for Squarewave Oscillator to Driver mini Transformer and Diode, Zener Diode to Out DC Voltage. Can work over a universal AC line input range 90-264 VAC and provides a 12VDC output at more then 4A load. The two ends of the primary are connected to a pair of paralleled MOSFETs each that tie them to ground in each conduction cycle (Vgs of the corresponding MOSFET high).
This is important, because the lower this resistance is, the less power they are going to dissipate when switching with a square waveform.
It can be connected to any type of stereo audio source such as iPod, Computer, Laptop, CD Player, Walkman, Television, Satellite Receiver, Tape Deck or other stereo system to transmit stereo sound with excellent clarity throughout your home, office, yard or camp ground.
Unlike other ESR Meters that only measure ESR value this one measures capacitor's ESR value as well as its capacitance all at the same time. Headphone amplifier is small enough to fit in Altoids tin box, and thanks to low power consumption may be supplied from a single 9V battery. It's small, power efficient, yet customizable through onboard 2 x 7 perfboard that can be used for connecting various sensors and connectors. You can control lights, fans, AC system, computer, printer, amplifier, robots, garage door, security systems, motor-driven curtains, motorized window blinds, door locks, sprinklers, motorized projection screens and anything else you can think of. When charging a battery, the term “C rate” refers to the current required, in theory, to charge a battery to its full battery capacity C in one hour.

Though somewhat less efficient than inductor-type regulators, the Figure 1 circuit offers equivalent line and load regulation.
The zener diode is to protect the circuit against transient overvoltage, and is optionalUsing only a standard NE555 timer and a few other parts, this circuit should be up an running in about an hour.
The no-load output voltage of the circuit is approximately 3VIN -2VD, where VD is the voltage drop across one diode. The inductance will cause the current to continue running, even if the power supply that caused this current is taken away. When applying 12V power, this transistor applies enough bias to the power transistors to get the oscillation started. A 2N3055 NPN power transistor is pulsed with a square wave signal that comes from the 555 timer IC.
The 2N2222 then drives the gate of the MOSFET and the MOSFET delivers the pulse to the ten turn winding on the flyback. The unit has overcurrent, overtemperature and overvoltage protections as well as passive inrush current limiting. The circuit includes an auto ranging as well as reset switch and produces very accurate and stable readings.
Arduino Prototype uses all standard through-hole components for easy construction, two of which are hidden underneath IC socket.
Also you can use it to boost the cooling power of the fans in your computer if they can handle the extra voltage. In actuality, power lost during the charge cycle ensures that all batteries charged at their C rate take more than an hour to reach full charge. The diode is used to keep the output capacitor from discharging during switching.It contains a 100 khz current based oscilator whose output is controled by feedback provided by R1 and R2. A P-channel MOSFET was used as power switch, and an unknown toroid from my junk box was pressed into service for the filter choke. Soon later, the 100uF capacitor charges up, the transistor goes off, and the power transistors self-bias into cut-off, such that cross-conduction is eliminated. This is achieved with the help of transistors T1 and T2, diodes D1 and D2, and capacitor C2.
The frequency of the pulses depends on the resistors between pins 7 and 8 and between pins 7 and 6. If you build this circuit you will have to adjust the potentiometers until you get the longest arc possible. USB IO Board is self-powered by USB port and can provide up to 500mA for electronic projects. Board features 28-PIN DIP IC socket, user replaceable ATmega328 microcontroller flashed with Arduino bootloader, 16MHz crystal resonator and a reset switch. These make a voltage divider such that at the wanted output voltage there is 1.24V at the junction of these two resistors. Because the circuit’s finite output impedance causes the output voltage to drop with load current (Figure 2), a practical limit for load current is approximately 30mA.
This is why you can easily create sparks with a coil, a spark is simply a current flowing at a very high voltage. The circuit works very well, with an efficiency of better than 60%, which is superb for such a low voltage output!I assembled the entire circuit, complete with power switch, in a small aluminum box measuring 4x4x6cm.
After removing power, the 6k8 resistor discharges the bias timing capacitor, as otherwise the circuit would be unable to restart!The secondary rectifiers are ultrafast diodes. When a load is connected at the output, potential drop across diodes D1 and D2 (approximately 1.3V) is sufficient for transistors T2 and T1 to conduct. You should only use a plastic bobbin (Wickelkern in german) with 2 chambers – one for the primary coil the second chamber for the secondary coil. They carry only 1 ma of current and are there to provide a reference voltage to an op amp in the IC.
As a result, the relay gets energised and remains in that state as long as the load remains connected.
Arduino sketches are uploaded through any USB-Serial adapter connected to 6-PIN ICSP female header.
What I use it for is to increase the speed and thus the airflow of a standard 80mm DC brushless fan. However, the power loss mentioned previously increases these charge times beyond the two time spans stated above.
As you draw more current from the output the total voltage would drop as would the 1.24v reference signal. The diode will dissipate around 2W at full output, so it would get too hot when free running. And the 220nF capacitors for the secondary filter are no typos; the diodes deliver almost pure DC, since the oscillation waveform is square, so only some noise filtering is needed. At the same time, capacitor C2 gets charged to around 7-8 volt potential through transistor T2.
Board is supplied by 2-5V voltage and may be powered by a battery such as Lithium Ion cell, two AA cells, external power supply or USB power adapter. The op amp feeds this to the oscillator telling it to provide more current to fill the demand. If the MOSFET still gets too hot or burns up you can place a 4 ohm (for a +12V supply) or a 5 ohm (for a +15V supply) between the source lead of the MOSFET and the primary on the flyback. However, capacitor C2 is still charged and it starts discharging through base of transistor T1. Make sure that these resistors havethe proper power rating for the voltage and current that they will be carrying.
After some time (which is basically determined by value of C2), relay RL1 is de-energised, which switches off the mains input to primary of transformer X1. Higher the value of capacitor C2, more will be the delay in switching off the power supply on disconnection of the load, and vice versa.

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