015 NPN BJT emitter follower common collector voltage enhancement

Emitter followers/common collectors using a NPN BJT can take the voltage of a weak signal and apply it to load with a loss of 0.6V. In doing so, the transistor provides the current needed to hold the voltage across the load that the signal is giving other than losing approx. 0.6V.

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YouTube video covering NPN emitter follower/common collector circuits



Assortment of commonly used integrated circuits (IC). I made a lot of videos with them.
Diagram used in this video added below.

Electronics course 15 better voltage transfer to load with NPN emitter follower common collector



White version of the oscilloscope that I use in many of my recent videos.

Diagram

Basic electronics circuit fragments and simple circuits 13 Stronger voltage using NPN bipolar junction transistor BJT emitter follower common collector diagram by electronzap electronzapdotcom
Basic electronics circuit fragments and simple circuits 13 Stronger voltage using NPN bipolar junction transistor BJT emitter follower common collector diagram by electronzap electronzapdotcom


One of my favorite portable power banks, this one has a better display than my version.

Why various signals need a voltage follower:

  • Trimpot voltage divider output can easily set a variable fraction of the supply voltage, but it can not provide much power.
  • Light dependent resistor voltage divider output can provide a very widely variable voltage, but not much power.
  • Zener diode circuit fragment output provides a relatively stable fixed voltage that is lower than the supply, but it is tricky getting enough current to hold the zener voltage and power a load.



Really easy to use USB multimeter tester used in a number of my videos.


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