How do you control the voltage of a battery?

Sometimes, your electronics project might just need a voltage source that’s lower than the battery voltage you have available. When this happens, you can reduce your battery’s voltage to any level you want by building a simple circuit called a voltage divider.

How do I lower the voltage on a 9-volt battery?

To reduce a 9V battery to 3.3 volts, use a zener diode, such as a 1N746 or a 1N4728A. Choose the appropriate one based on how much power it can dissipate. A 1N4728A has a 3.3-volt and a 1 W power rating. It can supply, on average, a stable 3.3 volts to a circuit or another component.

How much current can I draw from a 9V battery?

A standard 9V battery has about 400-600 mAh capacity. In the most basic terms, these batteries can supply about 500 milliamps for one hour before being “dead”.

How can charging current be controlled?

The charging current is controlled by a switch or transistor connected in parallel with the photovoltaic panel and the storage battery. Overcharging of the battery is prevented by shorting (shunting) the PV output through the transistor when the voltage reaches a predetermined limit.

How can we reduce current?

The current in a circuit is directly proportional to the electric potential difference impressed across the circuit and inversely proportional to the resistance of the circuit. Reducing the current can be done by reducing the voltage (choice A) or by increasing the resistance (choice D).

How do I convert volts to amps?

The formula to convert volts to amps at a fixed wattage is: amps = watts / volts.

What happens if you use 9V instead of 5V?

No! It might work for few minutes, but eventually the voltage drop on the internal regulator will cause the circuit to overheat and burn.

Is 9V a good voltage for a linear regulator?

9V is not a good input voltage to produce 5V through a linear regulator The first problem is how to reduce that 9V to 5V that the Arduino board can use. Most Arduino boards have an external voltage input, and a range of 7-12V is recommended. So 9V seems perfect.

Can I Power my Arduino with a 9v battery?

This one has come up a lot recently on the Arduino subreddit and Electronics stackexchange – can I power my Arduino with a 9V battery? The quick answer is yes, you can. The long answer is yes, but only if your goal is to chose the most expensive and short lived batteries possible.

Where is the 5V linear regulator on an Arduino Nano?

The Arduino-compatible nano that I use has an AMS1117 5V linear regulator, as printed on the top of the regulator, which is located on the bottom of the board. The datasheet is here: http://www.advanced-monolithic.com/pdf/ds1117.pdf.

What is the voltage range of Arduino?

Most Arduino boards have an external voltage input, and a range of 7-12V is recommended. So 9V seems perfect. The problem is that most Arduino boards use a linear regulator to drop that 9V to 5V.