![20PCS BD139 BD140 ( 10PCS BD139 + 10PCS BD140 ) TO126 TO-126 new voltage regulator IC - AliExpress Electronic Components & Supplies 20PCS BD139 BD140 ( 10PCS BD139 + 10PCS BD140 ) TO126 TO-126 new voltage regulator IC - AliExpress Electronic Components & Supplies](https://ae01.alicdn.com/kf/H3709f75cbb0c483abb158155e9a5c1fc1/20PCS-BD139-BD140-10PCS-BD139-10PCS-BD140-TO126-TO-126-new-voltage-regulator-IC.jpg_.webp)
20PCS BD139 BD140 ( 10PCS BD139 + 10PCS BD140 ) TO126 TO-126 new voltage regulator IC - AliExpress Electronic Components & Supplies
![DC Light Dimmer using BD139 NPN transistor (0 - 38v) / maximum 3A / Negative voltage control - YouTube DC Light Dimmer using BD139 NPN transistor (0 - 38v) / maximum 3A / Negative voltage control - YouTube](https://i.ytimg.com/vi/q3DRIZxApnA/maxresdefault.jpg)
DC Light Dimmer using BD139 NPN transistor (0 - 38v) / maximum 3A / Negative voltage control - YouTube
![1 WATT LED. Very good design. Circuit takes 70mA on LOW brightness and 120mA on HIGH Brightness… | Led projects, Electronics mini projects, Electronics projects diy 1 WATT LED. Very good design. Circuit takes 70mA on LOW brightness and 120mA on HIGH Brightness… | Led projects, Electronics mini projects, Electronics projects diy](https://i.pinimg.com/originals/e5/cf/d2/e5cfd2405f20bb01a3ba258843c8b92c.jpg)
1 WATT LED. Very good design. Circuit takes 70mA on LOW brightness and 120mA on HIGH Brightness… | Led projects, Electronics mini projects, Electronics projects diy
![arduino - Replacing BD139 for TIP122 - Cooler speed control circuit - Electrical Engineering Stack Exchange arduino - Replacing BD139 for TIP122 - Cooler speed control circuit - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/K0jOY.png)