I just want to know what you think (in order of when you think it) when you look at this circuit. I'll post what I think. 1) without input: Current goes through R1 and TR1 which allows more current to flow through R3, R4, C2 and R5 and to TR2. The current through TR2 inhibits the current that was already flowing through it to the output. 2) with input: slightly more current goes through TR1 some of which goes to the output As you can see it's fairly limited. I don't really know what the capacitors do here.