I wired four 74 series TTL chips to a standard 7805 regulator circuit. I'm having a problem where every chip takes huge amount of current (35 mA or so). The 7805 starts of course to heat and the output voltage raises over time until it's near the input voltage (strange, I thought 7805s could supply even 1 A without problems like that?). What's going on, shouldn't a TTL chip normally consume only something like 2 mA? I first thought it was cause of some kind of short-circuit but it isn't.