016 NPN BJT current source – Zener – Trimpot – LDR Light Dependent Resistor

NPN bipolar junction transistors make a good current source (technically a current sink). A resistor from the emitter to ground will set the current based on it’s resistance and the voltage across it (Ohms law). The voltage across the emitter resistor will be the voltage at the base, minus the 0.6V base to emitter drop.

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Video covering NPN BJT current source and diagram



A lot of the components that I use are in this diode and transistor semiconductor kit.
Electronics course 16 current source circuit NPN BJT zener diodes trimpot light dependent resistor



Power supply I use in my videos.

Basic electronics circuit fragments and simple circuits 14 NPN BJT current source using zener diodes trimpot potentiometer and light dependent resistor LDR diagram by electronzap electronzapdotcom
Basic electronics circuit fragments and simple circuits 14 NPN BJT current source using zener diodes trimpot potentiometer and light dependent resistor LDR diagram by electronzap electronzapdotcom



Kit that has everything you need to learn basic electronics and Arduino.


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