pcb design

Capacitors (and inductors) have the ability to store electrical energy, inductors store energy as a magnetic field around the component, but the capacitor stores electrical energy directly, as an ELECTROSTATIC FIELD created between two metal "plates". Basic Circuit symbols for capacitors • High Voltage Electrolytic- used in power supplies.  • Axial Electrolytic; lower voltage smaller size for general purpose where large capacitance values are needed.  • High Voltage disk ceramic; small size and capacitance value, excellent tolerance characteristics.  • Metalised Polypropylene; small size for values up to around 2µF good reliability.  • Sub miniature Multi layer ceramic chip (surface mount) capacitor. Relatively high         capacitance for size achieved by multiple layers, effectively several capacitors in parallel.  Uses of Capacitors. Decoupling --The most prevalent use of capacitors is to decouple a system,such as in