And the magnitude of this supplied current must be more in than the collector current. The maximum voltage that can be provided across emitter and collector terminals is 80 V. When no current is applied at the base terminal of this transistor, it turns off and this situation is termed as cut-off region. The BD139 transistors have numerous use in the applications of switches and amplifiers i.e., the two main uses of any transistor existing in the electronics arena. The BD139 transistor can be used as a switch to control lamps, relays, or even motors. Here we are using a simple circuit to easily understand how it works as a switch. The emitter terminal is connected to the ground of the power supply, the collector terminal is connected to the positive power supply through a load, here we have used a LED as load. If you would like to schedule an AMA on /r/pcgaming please send us a message via modmail. Looking for help with building or buying a PC? Check out /r/buildapc! | For all tech support questions please use the sticky! Join /r/pcgaming on Discord To check out our previous AMAs, click here. No personal attacks, witch-hunts, or inflammatory language. This includes calling or implying another redditor is a shill or a fanboy. No racist, sexist, homophobic, transphobic or other hateful language. Rule #1: No spam, porn, or facilitating piracy No calls for violence against any groups or individuals.Īny account less than 90 days old may be permanently banned on the first infraction of this rule. Please see our full rules on self-promotion here. Please see our full rules on piracy here. Rule #2: No advertisementsĪds include, but are not limited to, chat/game server & community recruitment (i.e. Discord, TeamSpeak), contextless website or subreddit links, and listings on eBay or other sales platforms. No affiliate or referral links: This includes Amazon, GMG tap links, Star Citizen, etc.ĭevelopers must be verified before posting about their projects and, once they are, are not bound by rule #2.
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