> Often a BJT or power fet is all they need (say for a basic relay trigger). Perhaps you mean BJT+resistor+diode+relay or FET+diode+relay is all they need? Th

> Often a BJT or power fet is all they need (say for a basic relay trigger). Perhaps you mean BJT+resistor+diode+relay or FET+diode+relay is all they need? The value in the module is that it includes the necessary components required so that the circuit doesn't break. And such breaking is highly destructive to the learning process. You need to get kids excited about what they might be able to do on a larger scale, before you can trick them into studying the lower level details and diligence required to make it happen. My own childhood explorations in electronics were stunted due to not understanding that BJTs were current devices, and what all those resistors were for. I'd try to modify a circuit, destroy a transistor, and then no amount of playing around would get things working again. Especially on those toy kits where every component was broken out into spring terminals - I basically learned that the transistor section was verboten unless I was building something exactly from the manual. Sometimes I ponder how much earlier I would have understood electronics in an alternative timeline that emphasized 2N7000's instead of 2N3904's.