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Our new Dual Power Supply Boards, provide a compact, quick and easy solution to providing a dual power source. This is the circuit diagram of a simple UPS that can deliver 12V unregulated and 5V regulated DC. Unregulated voltage is the one which will be higher when no load is connected and reduce as the connected load draws higher current. Hi Asaithambi You can use in full wave rectifier form with only two rectifiers instead of bridge rectifier with 4 rectifiers. I think 5v and 12v out is in dc,and only dc load can be connected.hw it can be connected to a ac load. Hi coool you cannot connect two batteries of different AH rating in series for while charging them, they will loose their operating life expectancy as their charge characteristics are different. 2) wat resistor should i use to charge the battery, 4.4 ohm 10w or more?Is there any over charge protection step for the battery? 3) And is 3A transformer enough for charging battery and to power my dlink internet modem of 1.2A at the “same time”? Sir, i wish to know whether the removal of R1 which is 220ohms for better charging of the 12v battery?
Hi Sooraj if you are using 12volt 7AH battery and if you load is around 1.5amp both 12 and 5 volt put together then it will work for 4hrs during a power breakdown. Hi Electrominds the transformer itself is rated for 12 volts hence with the pk voltage of 16.8 volt in series with R1 220 ohms, the drop across D3 and power consumed by LED, put together will not over charge the battery will only trickle.
Hi Edgardo You use 24 volt battery increase transformer rating to 24volt 2Amp secondary rating. It is very very good website I like it and you also visit my site and give me some ideas for it betterments. Here is the circuit diagram of a 5V transformer less power supply using minimum components. Hello sir, i want to make mains operated 2 chains blinking led circuit with 25 leds in each chain and 2 chains should flashes alternately. This is very good design power supply circuit but very hazardous to put in real and delicate circuits, hence some capacitor cannot handle surge voltage from mains , additional protection should be included eg. This is a basic universal variable Power Supply voltage regulator circuit using an LM317, 3-terminal regulator in a TO-220package. When external capacitors are used with any IC regulator it is good practice to add protection diodes to prevent the capacitors discharging back into the regulator in the event of abnormal operating conditions, like a sudden short circuit on the input or the output, or a back emf from an inductive load. 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.
Constantly changing computer specifications often cause power supply compatibility issues when you do a replacement or an upgrade. Technically, a 20-pin ATX connector can be plugged straight into a 24-pin motherboard socket, leaving pins 11, 12, 23, and 24 unconnected. More specifically, if a motherboard requires 3.3V current that exceeds 12 A or +5V current over 24 A, and it does not have an aux 6-pin connector, you should use a 24-pin PSU.
If you use high-end graphics card with an additional 6-pin or 8-pin power header, you may try to use an adapter that converts two 4-pin peripheral cables into a 6-pin PCI Express cable. The only potential problem with using a new PSU with an old computer is today's PSUs usually do not provide minus 5V output (they either don't have the white wire going to pin 20 at all, or they leave it not connected inside). Note: The information in this site is provided AS IS and does not constitute a professional advice.

The transformer T1 steps down the mains voltage to 12V AC and then the bridge B1 rectifies it. With the varying load demand if the voltage is constant it is called the regulated voltage.
I think the battery when connected in serial with a resistor will reduce the charging efficiency? The Universal Power Supply output voltage can be set to anywhere in the range 1.5V to 30V by selecting two resistances.
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. The frequent questions are how to connect a PC power supply with 20-pin main connector to a 24-pin motherboard or visa versa, and will a 20 pin plug work in 24 pin socket? The four pins that you are leaving open are just redundant lines for higher current capability (see this guide to ATX connectors and pinouts).
Note that 20-to-24 pin adapter cables are totally useless since all the currents are still passing through a 20-pin power supply connector. In this case, you may try using an IDE to SATA adapter, which attachs to one of 4-pin peripheral connectors and converts it into SATA connector with missing 3.3V rail.
For such an application, the PSU typically has to be >400W, or otherwise you may not have enough current rating on 12 volt output. It has the last four pins on a detachable section that slips out, so you can plug it into an older motherboard (see the diagram above).
Even some of ATX-I PSUs may not have "-5V", which was made optional in ATX12V version 1.2 spec as of 2002.
The rectified signal is smoothed by the capacitor C1.When the mains supply is available the battery will be charged via diode D3 and the regulator IC gets supply via diode D5.
On top of that there is diode D3 which will again drop the voltage by 0.6V which leaves us with 11.4V right?
By using a potentiometer, R2, as one of the resistors you can dial up the output voltage wanted. 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.
The power connector is polarized, so it's difficult to insert it wrong into the header unless you force it really hard. These adapters actually make things worse because they add extra resistance between PSU and the load causing more voltage drop.

Just don't plug the remaining 4-pin piece anywhere- it is not compatible with any other circuits! The Zener diode regulates the rectifier output to obtain a steady 5V DC and capacitor C2 acts as a filter. 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. Havya Kullan?m? Lehim Nas?l Yap?l?r TDA7377 Amfi Devresi Metal Dedektoru Devresi ICL8038 LM386 Daha fazla yaz?.. A simple math shows that with 20-pin main and 4-pin 12V2 aux connectors your maximum power could be 355 watt.
If your PSU happens to have a solid 24-pin connector, you can still try to insert it into 20-pin slot with the last four pins hanging over the edge of the board's connector.
When mains supply is not available the battery supplies current to the regulator IC and to the 12V DC terminal through diode D4.Also, the diode D3 blocks reverse flow of current during battery mode. Will it affect auto charging or will it reduce the output voltage to the unregulated 12v lead, while in power mode condition?
To be safe for continuous operation the maximun input DC voltage to the regulator should not be over 33V. 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. It does not apply to some branded cases (such as Power Mac's, HP and Dell), which use different non-standard wiring and may require an exactly-matching PSU. Whatever current flows through R1 also flows through R2, and the sum of the voltage drops across R1 and R2 is the output voltage. There was obviously a good reason to add extra four wires to the main cable-- it was done to support higher current requirements.
However, even if your system needs overall less than 355 watt, you still need to know the distribution of the currents on the motherboard and verify that you can get required amperage from each rail of your power supply. Then it should be asserted TTL logic high by the power supply within 100 to 500 ms after +12 VDC, +5 VDC, and +3.3 VDC outputs reach their regulation bands. In this case, if you can't find a power supply with such a rail, you can derive it from -12V by adding a negative linear regulator such as MC79M05.
The input DC voltage to the regulator must be at least 2.5V above the required output voltage. Arduino sketches are uploaded through any USB-Serial adapter connected to 6-PIN ICSP female header. If your system needs more amps on any individual rail and the motherboard does not have an auxiliary 6-pin power connector (which has been removed from ATX 2.0 spec in 2003), you would be better off going with an ATX12V version 2 compliant power supply with 24-pin connector, even if your old PSU has sufficient overall power rating. Conversely, it has to switch to TTL low state when any of positive DC voltages falls below its under voltage threshold, or at least 16 ms after input power has been removed. 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. This may be too much for a stand alone device, so may you need to attach it to a little heatsink. Modern systems may have booting problems and may not work without properly functioning PWR_OK signal.

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