Linked Questions

1
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2answers
17k views

How to convert 9v to 3.3v and 5v? [duplicate]

I am very new to electronics and hardware. I want to know how can i convert 9v to 5v and 3.3v using only resistors ? Basically, this is what i am trying to do - I want to supply power (3.3v) to an ...
-3
votes
4answers
7k views

I want to have a 9v battery to give a 4.5v - 5v power supply? [duplicate]

I am trying to download a program on to my PIC circuit. As you know the pic isn't supposed to operate with anything larger than 5v. I don't have any access to a battery pack which could hold 3 x AA ...
1
vote
2answers
2k views

voltage drop alternative to resistor [duplicate]

My application requires me to drop voltage from 12v to 6v or any other lower voltage. I have used resistors but they are not efficient for prolonged use as they tend to heat up and burn my fuse. I ...
0
votes
1answer
2k views

How to drop 230V AC TO 200V AC [duplicate]

Is there any way to drop 230V AC to 200 V AC by using resistor? I want to drop voltage before applying to a 12 0 12V 500mA transformer. If yes what will be its rating?
0
votes
3answers
1k views

What is the most efficient way to effect a voltage drop in a dc cct? [duplicate]

I have a 24V supply and need to drop the supply voltage to 19V to power a TV set. The plug pack that powers the TV states the output as 19V and the current at 2.1A I could use a resistor to drop the ...
-2
votes
1answer
521 views

How to reduce dc 5 volt to below 1.5v by add extra load [duplicate]

I have an USB charger with 5V DC output. I want to use this charger to power a 1.2V DC motor. I think about adding an extra load, like a DC bulb, to this circuit, maybe it could reduce the voltage ...
0
votes
2answers
821 views

How to convert 9v supply to 5v? [duplicate]

I am making half adder circuit for my school project but I saw their datasheet and it says maximum supply volate is 5.25v and I have 9v battery, How do I use it if I want to test my circuit without ...
-2
votes
1answer
787 views

Simple circuit design : USB in | 4v out [duplicate]

After some bad luck with cheap Chinese products, I'm looking to build myself a simple USB "pass-through" e-cigarette. For anyone not familiar with e-cigarette, the idea is very simple : you put ...
5
votes
2answers
1k views

How to use motor drivers with H-bridge and PWM input, to control direction and speed of DC motors?

I'm running series of experiments using a 6V DC motor. I'm using desktop DC power supply to power the motor and regulate its speed and everything works just fine, the setup has been running for months....
3
votes
2answers
2k views

3V power rail from 5V

I've mistakenly ordered some 3V PIC18 L F14K22 instead of the 5V 18F14K22. 3V output is fine for the designed circuit but I need to make a 3V power rail from the available 5V rail. Since only a ...
1
vote
3answers
294 views

What would happen if I used a potentiometer to produce a 5V DC signal for an Arduino from a 9V battery?

What makes the potentiometer not a good component to use for reducing the 9V to 5V DC for an Arduino? I thought of using it but I been told it is not a good idea, so I am looking into the reasons why.
0
votes
1answer
93 views

Why doesn't the voltage of the load fluctuate in a Zener Diode circuit?

I'm very new to this field so sorry for this silly question. What I've learnt is that when any number of devices are connected in parallel (and none in series with the battery) with the battery, the ...