What would be the best configuration for amplifying output from 555 timer chip? No matter what transistor configuration I cannot get it higher than 30 mA (I am shooting for 200 mA).
Yes and not only that, you're going to lose another ~0.65V through the transistor.Would switching to maybe 9V change the frequency of both oscillators?
Maybe the transistor's base is at a lower voltage (due to voltage lost inside the 556?) then the +5V collector voltage.
I wouldn't say the transistor is operating in either the triode region or constant current mode. In this case the current is determined by the amount of current supplied by the 556 and the beta of the transistor, provided there is enough voltage available. It is also possible that the beta of the transistor is low and the 556 can't supply enough current. I don't think just connecting the collector to 9V will help unless you also connect the 556 to 9V too.Could this cause the TIP120 to operate in the triode region rather than constant current? If so, would applying 9V to the collector instead of 5V increase the current? I am getting power from a 9V battery which is regulated to 5V with the LM317; so it would be easy to connect the collector to +9V instead of +5V.