Please see the corresponding discussion thread at Wikipedia talk:WikiProject Electronics. Thanks! • Sbmeirow • Talk • 23:27, 15 December 2013 (UTC)[reply]
group1 is single diode only. group2 may be double diode, thyrisor, IC and other. It is not only transistor. Voproshatel (talk) 13:07, 3 October 2022 (UTC)[reply]