- Joined Mar 19, 2019
Most of the Common Base Amplifiers include a capacitor from the transistor base to ground. Some do not. Just what is the purpose of this capacitor? I built this circuit for example, which does not include the capacitor. Adding or removing a base capacitor seems to have no effect on the amplifiers output. Any AC component on the base will be going to ground through R2 even with a capacitor added. Is the capacitor intended to be a low resistance path to ground for any AC component?