Update powersupply.md

More losenge than ever before!

Author: Gadgetoid

hardware/powersupply.md

@@ -21,14 +21,13 @@ Power to the micro:bit may be provided via:
 
 Power from the micro:bit can be provided by the 3V and GND pins to small external circuits.
 
-It's is important to stay within the design parameters of the board:
+It is important to stay within the design parameters of the board:
 
-* When powered from USB, the on board interface chip (KL26<span class="v1">v1</span>/KL27<span class="v2">V2</span>) uses it's on chip
-regulator to provide power, and this chip is rated at a maximum of 120mA.
+* When powered from USB, the on board interface chip (KL26<span class="v1">v1</span>/KL27<span class="v2">V2</span>) uses its on-chip
+regulator to provide power. This chip is rated at a maximum of 120mA.
 
-* The on-board current budget will vary depending on the use of the display,
-the Bluetooth, microphone, speaker and other peripherals. You should allow a worst case budget
-of 30mA for when all on board peripherals are in use, leaving <span class="v1">v1</span>90mA/<span class="v2">V2</span>270mA for circuits
+* The on-board current budget will vary depending on the use of the display, Bluetooth, microphone, speaker and other peripherals. You should allow a worst-case budget
+of 30mA for when all on-board peripherals are in use, leaving <span class="v1">v1</span>90mA/<span class="v2">V2</span>270mA for circuits
 plugged into the edge connector.
 
 * When powered from a battery, the KL chip is not powered up and the USB Indicator LED will not light up.
@@ -37,10 +36,10 @@ plugged into the edge connector.
 
 ### Key Voltages
 
-As taken from each of the chip data sheets, it can be seen that different
+As taken from each of the chip datasheets, it can be seen that different
 devices have slightly different operating voltage ranges and absolute
-maximum voltages. Manufacturers state the operating voltage range as well
-as the absolute maximum tolerable by the device. You should never exceed
+maximum voltages. Manufacturers state the operating voltage range and
+the absolute maximum tolerable by the device. You should never exceed
 the operating voltage range of any of the devices.
 
 ### v1 revision
@@ -83,15 +82,15 @@ current from the regulated supply is 120mA. Some of this current is required to
 run on-board devices, such as the KL26 itself, the nRF application processor, the motion sensor, and the LED display. When Bluetooth is enabled, the current
 consumption of the nRF increases slightly. You should budget your current
 requirements for anything you attach to the micro:bit <span class="v1">v1</span> to not exceed about
-90mA to give enough safe headroom for worst case with all on board peripherals
+90mA, giving enough safe headroom for worst case with all on-board peripherals
 in use.
 
-This means that if you require more than 90mA from the edge connector,
+If you require more than 90mA from the edge connector,
 (e.g. driving lots of NeoPixels or a small motor) these should have power supplied
-to them externally. You can back-power the micro:bit via it's 3V pad, but please
+to them externally. You can back-power the micro:bit via its 3V pad, but please
 be sure to use a properly regulated supply and a protection diode, as explained
 below, so that your micro:bit always has a supply within the operating range of
-all the on board peripherals and the supplies are not able to power each other.
+all the on-board peripherals and the supplies are not able to power each other.
 
 It is advised that you do not power the micro:bit from USB battery packs. This is
 because some makes and models of USB battery packs can generate out of range
@@ -117,12 +116,12 @@ There is further information about the [battery connection and use](https://supp
 ### 3V Ring Powering
 
 The micro:bit may be powered from the 3V/GND rings on the edge connector.
-There are also two losenge shaped pads on the far right of the back of the PCB
+There are also two elongated pads on the far right of the back of the PCB
 that can be used to supply power (e.g. solderable pads for a 2xAAA holder that
-has wires or pins at one edge). [The topmost losenge is 0V and the bottom most
-losenge is 3V](../../accessories/making-accessories/#battery-pads).
+has wires or pins at one edge). [The topmost pad is 0V and the bottom most
+pad is 3V](../../accessories/making-accessories/#battery-pads).
 
-When powering from the 3V ring or the losenge on the PCB, you should take
+When powering from the 3V ring or the elongated pads on the PCB, you should take
 appropriate best practice precautions:
 
 1. Fit an external protection diode (preferably with a low Vf rating)
@@ -137,9 +136,9 @@ of over voltage protection, or proper regulation.
 ### Power Supply Architecture v1
 
 The [schematic](/hardware/schematic/) shows the architecture of the power supply.
-Key points to note are that there are two BAT60A diodes, one from the 3.3V
+Note that there are two BAT60A diodes, one from the 3.3V
 supply from the KL26/27 interface chip, and one from the external battery connector.
-Note that the 3V ring on the edge connector is V_TGT, which is the raw
+The 3V ring on the edge connector is V_TGT, which is the raw
 supply provided to all on board chips, so this is why extra care
 should be taken when connecting directly to the 3V ring or the 3V losenge.