16-06-2017, 01:43 PM
You did! And if beta changed, it would make very little difference as your potential divider for base bias is passing current which swamps it anyway.
However, I'd say that you haven't calculated input resistance, which is partly directly proportional to beta. The inherent transistor emitter resistance is 26 ohms, beta is 200 so we get 5.2k. This is much lower than the base bias divider, so input resistance is heavily dependent on beta, which could be critical if you are operating from a high-impedance source.
I'd also like to question the emitter bypass capacitor - for a low-frequency 3db cutoff of 10Hz, you want the capacitor'reactance to equal the emitter internal resistance (26ohms) in parallel with the external 1k, and this gives 628uF, not 16uF!
However, I'd say that you haven't calculated input resistance, which is partly directly proportional to beta. The inherent transistor emitter resistance is 26 ohms, beta is 200 so we get 5.2k. This is much lower than the base bias divider, so input resistance is heavily dependent on beta, which could be critical if you are operating from a high-impedance source.
I'd also like to question the emitter bypass capacitor - for a low-frequency 3db cutoff of 10Hz, you want the capacitor'reactance to equal the emitter internal resistance (26ohms) in parallel with the external 1k, and this gives 628uF, not 16uF!
