5v dc power supply battery backup

A good regulated AC to DC power supply circuit is essential for any electronic hobbyists and electronic students to do thier electronics hobby projects. Below is the circuit schematic of rectifier regulated power supply using 78XX voltage regulator IC. Circuit consists of 4 parts: Step down transformer, bridge rectifier, capacitor filter and voltage regulator IC. In both the cycles load current flows in same direction, hence we get a pulsating DC voltage across the points B-B’.
The pulsating content are called ripples and a filter capacitor is used to remove the ripples from pulsating DC. When the instantaneous values of pulsating DC voltage increases, the capacitor gets charged up to peak value of the input.
When the instantaneous values of pulsating DC voltage decreases, the stored voltage in the capacitor reverse biases the diodes D2 and D4. During the next cycle, when the peak voltage exceeds the capacitor voltage, diode D2 or D4 forward biases accordingly, as a result capacitor again charges to the peak value.
Then the filtered voltage is applied to the input of 7805 voltage regulator IC, it in turn regulates the voltage for line and load fluctuations. Brown color indicates capacitor output DC and Red color is the regulated  5V DC  from 7805.
Hi sir mail me the complete calculation with an example for power supply designing using bridge rectifier and regulator 7805. Hi may i have the schematic for a dc power supply with a fixed 9v output using bridge rectifier?
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I have seen some examples of people powering their Raspberry Pis by wiring a DC "barrel plug" style power supply to the 5V and GND GPIO pins. By studying the schematic you come to realise there are 3 more voltages (4 in total) used on the Pi. This sub circuit which is connected to the 5V0 rail has 3 voltage regulators with their own filter capacitors.

You need to realise that the USB schematic was carefully designed to be used as the primary +5V input and protects the Pi from getting fried. Cut the micro USB cable and use the RED and BLACK colour coded cables and connect it to your power adapter.
A lot of people are complaining about USB fuses but I havn't seen too much of them complaining about input fuse. Cant be Alex- If it was the case then the 5v bus would connect to TP1-- or the TP1 would all together be on the 5v Bus and not before the filtering caps.
And last thing is that there is some smoothing capacitors that makes power more stable so it would be wise to connect some capacitors yourself.
Wait, you're basically saying I could create my own voltage input circuit (with protection) and hook that up to the raspberry Pi? If you look at the schematic, you can see that the 5V pin is connected directly to the 5V rail. Connecting a barrel connector to the 5V and GND pins will be fine, but be wary you won't have the protection of the input fuse - such is life. Even if you use a dc power supply, connected to gpio, is very unlikely burn the nvcp1117-3v3 but you can use any kind of usb device.
If you use microusb power connector ,to give power to raspberry pi, you can not use many usb device because there is not enough power.
A good idea was make some modification to rasperry pi to give +5v directly from "microusb power connector" to usb and gpio ,without pass through 5v+ bus,like thise .
You can use the 4 NiMh batteries - but I would always check that the voltage is 5v or within .25v of that. Simple Fix, Soldier to the side of the fuse that goes to the USB connector to your +5v in line, and your gnd to tp2 or the side of the capacitor that goes to gnd.
Ive made a 5v 50A (drastically over powered (no heat)) regulator so i can run 12v battery instead of the 5v that is in it. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site. Not the answer you're looking for?Browse other questions tagged gpio or ask your own question. Also a bridge rectifier power supply is one of the introductory circuits for beginners. Firstly we need to know what is a bridge rectifier? A rectifier circuit employs the conversion of AC voltage to DC voltage. Sir, I’m trying to monitor a ac motor using the 30amp acs712 hall current sensor that converts motor amp to a 0-5 Vout signal.

Sir, I’m trying to monitor a ac motor using the 30amp acs712 hall current sensor that converts motor amp to a 0-5 Vout signal.
Do I need to add any protective components or will any decent 5V power supply with a high enough current be fine for long term use and not destroy my Raspberry Pi? In this sub section the +5v supplied from the USB connector is filtered to give a nice stable 5v supply to the 5V0 Rail.
The GPIO pin does not offer this protection fully and you really need to trust your power supply if you want to do that! We all know the fuses cause more problems than they solve and the capacitors are still in the circuit, just not in a brilliant place - ah well, use a better PSU. I personally wouldn't drop fuse on input voltage and I have seen many others saying the same. Most power adapters won't output regulated voltage (unless stated otherwise on them) so you would also need to use some voltage regulator circuit.
Also I used a Nokia mobile phone USB connector connected to a USB socket from a broken, cheap hub (from a pounshop originally so only ?1) with only the 2 outer lines soldered to wires going to the battery pack.
Full wave bridge rectifiers have the benefit that they transfer both half cycle of AC input into DC output and also efficiency is two times greater than that of half wave rectifier. I would like to change that signal to DC using a full wave rectifier with a filtered to smooth out the output signal. BUT, it has no backward protection and it was not really designed to be a 5volt input pin. One may, however, use some fuse before voltage regulator, so that it won't drop any more voltage after it is regulated but still protect from shorts. So if you do, a lot of current (depending on how much you power supply can supply) can flow through your Pi and can damage it.
I was actually looking to design a circuit, with some other connectors and transistors (to drive relays and 5v stuff! Solder this regulated power supply circuit on PCB and enclose it in a suitable case, definitely it will  help you for future circuit projects. With a custom expansion board incorporating a PSU, you will be more than fine - you'll probably be giving a better supply than the Pi gets atm.

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