The BD135, BD137 and BD139 are silicon epitaxial planar NPN transistors in Jedec SOT-32 plastic package, designed for audio amplifiers and drivers utilizing complementary or quasi compementary circuits. The complementary PNP types are the BD136 BD138 and BD140.

Main Content

Function Generator (AD9833 Based)

“Hi, I am Gursimran Singh In this Instructable, I will guide you through on how to make a “functional” function generator, which can be very helpful when working with electronic circuits. A function generator can generate different kinds of signals …

Digital Controlled Linear Power Supply

“In myteenage years, about 40 years ago, I created a dual linear power supply. I got the schematic diagram from a magazine called ‘Elektuur’, nowadays called ‘Elektor’ in The Netherlands. This power supply used one potentiometer for the voltage adjustment …