(New tips are continually added to these pages. Check back in a few months' time for more)

TOPIC 17: Electronics

Tip 1:

Many students are confused about the difference between the terms positive feedback, negative feedback, inverting amplifier and non-inverting amplifier.

Some even mistakenly equate positive feedback as non-inverting amplifier!

The table below will give an overview of the above classifications:

	Feedback to the Inverting Input	Feedback to the Non-Inverting Input
Negative Feedback	Inverting Amplifier	Non-Inverting Amplifier
Positive Feedback	Inverting Schmitt Trigger	Non-Inverting Schmitt Trigger

Tip 2:

NAND gates and NOR gates can be used to form any other gates (except Bill Gates).

So if one day the world runs out of OR, AND, NOT, EXOR, EXNOR gates. Fear not. If you have NAND or NOR gates, you can use it to construct all the other gates.

But for exam purposes, you need only to memorise one configuration of creating an EXOR gate from a number of NAND gates.

The configuration can be found it your Option Booklet on Electronics.