The Why And How Of Bias And Offset Adjustments For Audio Amplifiers

This video explains how to adjust the offset and bias of transistor audio amplifiers and why you might want to perform these adjustments. To explain this, we go through the simplified schematic of a class AB amplifier. 00:00 Intro 00:25 Basic class B amplifier 02:22 Class AB amplifier 03:43 Thermal instability 05:02 Bias adjustment 06:18 Closed loop class B amplifier 07:20 Understanding the offset voltage 08:06 Offset adjustment 08:35 Identifying the trimpots on the PCB 09:42 How to adjust the bias 10:55 How to adjust the offset 12:19 Looking at crossover distorsion using the oscilloscope 13:53 Outro How I built the dummy load used in this video:    • Designing An Adjustable Dummy Load For Aud...   Sansui G-5700 service manual: https://elektrotanya.com/sansui_g-570...