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What is the main use of ic 7812?
Here is circuit 9V power supply regulator with battery 12V backup system. Use IC 7812 and 7805 control voltage output by R3 1K output 9V 1A max. This is a 9V power supply which will work even on power failure. It uses a rechargeable battery and regulators. A transformer with 15-0-15 AC volts output is required. In the first regulator U1 the output is lifted up by 1.4V and in the second regulator U2 by a resistor divider. In the second regulator the voltage across resistor R3 is 5V, so the current is 5V / 1K = 5mA this adds to the quiescent current of 5mA from the regulators ground terminal and flows into the resistors R1 and R2 in parallel which form 404 ohms, 10mA thru 404 ohms is 4V. So the output will be 5 + 4 = 9V. Note that the charge and discharge paths of the battery are separated with diodes.
Can a 9v dc motor produce 9v when it is used as an alternator?
A: No problem but don't expect the power to increase
Can you use a 9v dc 1000ma adaptor for a device that has 'power input' of 15v dc 800ma?
A: Disregarding the fact of different voltages there is the power to be concerned 9v x 1A = 9W, 15V X .8 = 12W. THE DEVICE WILL BE UNDER POWER.
Can you convert a 9v battery snap to a dc power supply?
You would need a 9V dc supply. The potential current output of you supply myst be greater than or equal to the current draw of the pedal. (100ma load on a 150ma supply: fine. 150ma load on a 100ma supply: bad.) With these conditions met you can just get another 9V snap and wire it to your supply. Remember, as you are connecting two snaps together, the polarity of the snap for your supply will be reversed. (Red is - and black is +) CHECK YOUR WORK! If you mix up the polarity, you could smoke your pedal. You can also make your own regulator with a LM317 voltage regulator from a higher supply. This will only work with another low voltage DC supply with a voltage output higher than 9V. It will not boost the voltage and will not work with line voltages. It is a common IC and many manufacturers make them. Check your pedal. Most of them have DC in jacks so you don't need to hook to the battery clip.
What is meaning of 9v-0-9v transformer?
It is kind of transformers called center-tap transformer its main function is to transform primary voltage to 2 secondary voltages or vice versa. In your statement the transformer will convert the input voltage to 2 voltage each is 9v or the opposite it will convert the 2 input voltages with each 9v to a certain value depending on the turns ratio of the transformer.
Can you use a 9v 300mA adapter on a 9v 200mA device?
No. The adaptor will overheat.
Will 9v 300mA power adapter work with a 9v 700mA device?
No, the adapter's power output has to be equal to or greater that the current draw of the device.
If the original power supply indicates an output 9v and 700mA and you use one that indicates an output of 9v and 2000mA will this disturb the performance of the machine a pedal effect or even ruin it?
No.
Can you safely use a universal AC adaptor set for 9V 300mA for a game that requires a 9V 700mA?
No, a power adapter must supply the same voltage, same polarity, and at least as much current as the load requires. Your adapter can only supply 300mA, which is less than the 700mA required by the load.Your game probably will not turn on and the power adapter may be damaged.
What is the difference between a 9v 300mA Adapter and a 12v 300mA Adapter?
difference is 2.7 amperes in numbers will be 12 volts 3 amps and the other will be 12 volts .3 amps
Can you use a 9v 600Ma adaptor to power a 9v 300Ma appliance?
I think you mean to ask if one can use a 9v 600mA adapter to power a 9v 300mA appliance. Yes, you can do that. A 9v 600mA adapter will deliver 9v at up to 600mA. A mA is one milli amp, or one thousandth of an amp. 300mA is 300 thousandth of an amp, 300/1000 or 0.3 amps. 600mA is 600 thousandth of an amp, 600/1000 or 0.6 amps, and is twice the current of 300mA.
Can you power a 9v 700ma device with a 9v 300ma adaptor?
No. The device will try to draw 700 milliamps which will overload the 300 milliamp adapter most likely causing it to burn out and possibly catch fire.
Can you use a 9V 600mA adapter on a 9V 400ma scanner?
You can use any 9v adapter as long as the output amperage is rated higher than the amperage rating of your appliance so yes a 600ma adapter can be used to power a 500ma or 400ma appliance
Can you use a 9V 500MA charger with a mini spy camera that suggests 8V 300MA?
No, you will burn out the camera. You can pick up the correct mini spy camera power adapters in the "Related links" section just below this box.
Would a device requiring dc 9V 1000mA output work with an adapter with dc 5V 3A in output?
No. Usually it's a -/+ 10% difference. So, a 9v would need at least 7.2 volts or more
How can you charge your handphone battery 3.7v by using 9v battery without damaging it?
You can use a step-down voltage regulator to reduce the 9V output from the battery to the 3.7V needed for your handphone. This will prevent the handphone battery from being damaged due to overvoltage. Make sure to use a regulator that can handle the current needed by your handphone.
Can I use a dc 9V 350mA ac adapter in place of 9V 210mA adapter?
Yes, a 350mA capacity output will work well on a 210 mA load. This presumes that the old adapter worked well on the load that was connected to it. The load for the old adapter had to be below 210 mA.
