Deadly, i'll use that, it's perfect. The next stage is where i create four one-hour lab session to demonstrate how to; calculate the loop-gain, show how the loop gain varies with frequency, show how a amplifier becomes unstable, demonstrate how to stabilise it. I haven't completely decided on these labs so if anybody thinks they'd do it differently please let me know. I've already decided that i'm going to use simple op-amp circuits in these labs. What i need to do is create these circuits. Does anyboddy have any examples / suggestions/ ideas on what circuits would suit the labs?