![]() Figure 1 shows this type of load switching. The actual electronic switch element comes in two variants: Bipolar Junction Transistors, or BJTs, and MOSFETs.īefore getting to the actual switch itself, let’s define what is meant by low-side switching. One of the simplest approaches to controlling large loads that operate on DC current is the saturated switch. However, this approach means that some liberties have been taken with technical rigors. A few simple math calculations are required to determine typical component values, and these will be presented in easily accessible formats. ![]() Let’s look at several ways to switch heavier loads on the low side from a typical microcontroller output. ![]() That’s because the output drive of most microcontrollers can directly source or sink only about 10mA. One thing that microcontrollers cannot do is directly control anything other than, maybe, a single LED.
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