To improve my design skills I like to look at the schematics of commercial stuff. In those designs I often see transistor switches connected as below.
. VCC . + . | . .-. . | | RL . | | . '-' . R1 | . ___ |/ . Vi--|___|---o----| . | |>
. .-. | . | |R2 | . | | | . '-' | . | | . '------o . | . === . GND . (created by AACircuit v1.28.6 beta 04/19/05
I usually only use R1, why would I need R2?
I calculate my R1 this way: R1 = (Vi-Vbe)/(0.1*iLoad) How would R2 affect this?
Thanks, Jenalee K.