Designing a classic transistor VCA from scratch

Support the channel: Working simulation on falstad: In this double episode, Ill walk you through the process of designing a classic transistorbased VCA (voltage controlled amplifier). The goal is to first demystify the bipolar junction transistor (BJT), its usage in a common emitter amplifier plus its two central flaws (variations between seemingly identical samples temperature dependence), before then exploring the differential amplifier (also known as the longtailed pair) and how we can get it under voltage control. Inverting amp indepth explanation: AC coupling indepth explanation: