"Alternatively, you can use the transistor as an open collector driver, which is a class-C amplifier." I don't get it. Maybe I'm from the old school where Class C amps were only used for RF (I can't recall a single audio application for a stage biased Class C and conduction angle for each cycle was significantly less than 180 degrees) where the tank circuit provides for the balance of the re-creation of the waveform (tank, or LC resonant circuits being analogous to balance wheels or tuning forks of sorts). The "open coll." app above sounds more like the 2n2222 is being used as a switch, perhaps in PWM mode as in class D or the like. Jim ----- Original Message ----- From: "David VanHorn" To: Sent: Sunday, February 10, 2002 1:44 PM Subject: Re: [pic]: Can you amplify with a single 2n2222 ?? > > > >Can you make a little amplifier using a single 2n2222 transistor? > > Certainly. Look up class-A amplifiers. > Alternatively, you can use the transistor as an open collector driver, > which is a class-C amplifier. > > > -- > Dave's Engineering Page: http://www.dvanhorn.org > -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads