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Drivers and Buffers
Most processors operate from low voltags and are only able to supply enough current (a few mA) to operate LEDs as output devices. In order to operate more powerful output devices it is necessary to interface the processor to the output device. This is achieved by using a 'driver', 'buffer' or 'power switch'. There are many different drivers available, some of which are listed below. Two of the most important drivers are junction transistors and MOSFETs. These devices are able to switch currents of 100+A and voltages up to 1000+V. Bipolar Junction Transistors MOSFETs Opto-isolators Relays Thyristors Transformers Triacs