The S9013 is manufactured in a plastic TO-92 case. When looking at the flat side with the leads pointed downward, the three leads emerging from the transistor are, from left to right, the emitter, base, and collector leads. The S9013 transistor might have a current gain anywhere between 64 and 300. The gain of the S9013D will be in the range from 64 to 91, S9013E ranges from 78 to 112, S9013F ranges from 96 to 135, S9013G ranges from 112 to 166, S9013H ranges from 144 to 202, S9013I ranges from 190 to 300.
“A Working Replica of the classic 555 timer made using discrete components A fully functional replica of the classic 555 timer made using discrete through hole components which include only basic jellybean components like (to - 92) BJTs , 1/4Watt resistors …
“Simple DIY switch for 12V lamps. Activate with a clap, turn off with another clap.”