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This is an adjustable voltage regulator using lm317. we can control the voltage from 1 to 35 voltage. this circuit can make 1.5 amperes.

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A set Base voltage and emitter resistor can set the current through a PNP Bipolar Junction Transistor (BJT). Joe Knows electronics semiconductor kit is a nice addition once you have the basic components. Unfortunately it may be out of stock though. The link is an affiliate ad that supports this site. A trimpot can set … Continue reading "PNP BJT Current Source"

How to Learn electronics for beginners, students, who are Interested in the hobby. Or parents who want to find good activities for children.

Is is easy to test the polarity of a circuit's point whether it is positive or negative by using the tester circuit featured here. The tester circuit has

PN4355 PNP General Purpose Transistor is designed for use as a general-purpose amplifier and switch requiring collector currents to 500 mA

Read about Transistor Biasing Calculations (Bipolar Junction Transistors) in our free Electronics Textbook