Content for BD140

BD140

These epitaxial planar transistors are mounted in the SOT-32 plastic package. They are designed for audio amplifiers and drivers utilizing complementary or quasi-complementary circuits. The NPN types are the BD135 and BD139, and the complementary PNP types are the BD136 and BD140.

How to Make an Emergency Light

“Emergency lights are very useful gadgets and are quite popular, too. During the power failure, these portable lights are able to instantly illuminate through battery back up and never allow us to stumble in the darkness. Although you will find …

Raspberry Pi CPU Temperature Indicator

“Previously I had introduced simple raspberry pi (Hereinafter as RPI) operational status indicator circuit. This time, Ill explain some more useful indicator circuit for RPI running as headless (without monitor) manner. The circuit above shows CPU temperature into 4 different …

Raspberry Pi Shutdown Indicator

“It’s very simple circuit for showing operational status of raspberry pi (Hereinafter as RPI). Maybe it’s useful when you running RPI as headless (without monitor). Sometimes I’m concerned when is right time for completely power-off after shutdown …

0-30V 3A Adjustable DC Supply

“This is cheap adjustable 0-30V 3A Laboratory DC Power Supply circuit. It is high efficiency regulator circuit by using IC regulator UA723 and TIP3055 as power transistor so easy to install. It is designed to protect over current load maximum …