inputs.text: huge time saver designing circuits teaching electronics - see cs440 instruction manual elenco details two rotary switches allow usage one capacitor time great simple circuit design also see elenco rs400 resistor sub box soldering requiredpros simple design takes less 1 hour completely assehemble completed assehembly feels solid durable expect last lifetimecons kit one wrong capacitor value fortunately checked installation swapping another lying around not problehem one capacitor time selector switch alternates left right knobs range somewhat limited see schehematic included instruction manual list values