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Microbit Capacitance Meter

What is a capacitor?

A device that stores electrical charge which in its basic form consists of two conducting plates separated by a dielectric.

In addition to the basic parallel plate several other forms of construction exist an example being that the plates in the form of a metal foil allow the capacitor to be formed into a roll reducing its size.

These basic types tend to be of low capacitance, polystyrene film being an example with capacitance of <=10nF and single layer ceramic up to ~1uF.

Variants of these forms exist using different dielectrics and construction for a variety of different uses.

Beyond the basic forms are the polarised (Electrolytic), types which employ a gel or liquid electrolyte with capacitance up to ~1F, used in coupling, decoupling, supply and timing applications.

This brings us on to the subject of timing which is a property which we will be making use of in this project.

Microbit (V1 or V2)
Microbit Breakout board or equivalent
BS270 NFET or equivalent
10K resistor
56k resistor
1k resistor - Qty 2
Stripboard (24 Holes x 12 Holes)
PCB Screw Terminal Block 5mm pitch
SIL pin header”

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