1. The problem statement, all variables and given/known data Hello! I would like to check on my knowledge of bypass capacitor which bodders me a bit 2. Relevant equations Is that true? 3. The attempt at a solution Bypass capacitors are use to filter AC ripples. It does it in the following way: Lets imagine an RC amplifier. When the friquency is high, Xc is low and it acts like low resistance path. So the Ac signal gets shortened to ground and instead of riding on the DC through the resistor RE, it bypasses it and so the voltage at the emitter remains unchanged. But witjout the capacitor, the AC would pass through RE with the DC signal and couse VE to rise and so eventualy it causes some distorsions.