Talk:Circuit Idea/NFB Transistor Current Source

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Here is the building "scenario" that my students (group 68b) and I were using during Lab 3 to transmute an emitter follower into a negative feedback BJT current source. Circuit-fantasist (talk) 13:26, 28 April 2008 (UTC)



Contents

[edit] Lab 3: "Inventing" a negative feedback BJT current source

Thursday, April 10, 2008, 16.45 h

[edit] Transistor as a current-stable resistor

A BJT acts as a current-stable resistor (by Lora Kirilova).
Showing how a BJT acts as a current-stable resistor (by Lora Kirilova).


[edit] Comparison with a voltage-stable resistor

Conversely, a diode acts as a voltage-stable resistor (by Lora Kirilova).
The pointers represent two IV curves (by Lora Kirilova).


[edit] Making transistor behave as a voltage-stable resistor

[edit] Building the simplest negative feedback follower

The simplest negative feedback follower consists of power source, a regulating element and a comparator (by Lora Kirilova).


[edit] Building an emitter follower on the whiteboard

The transistor of the emitter follower acts as a regulating element (by Lora Kirilova).


[edit] Mounting the emitter follower on the PCB

Mounting the circuit... (by Lora Kirilova)
... on the PCB (by Lora Kirilova).


[edit] Investigating the emitter follower

Investigating the emitter follower on the PCB (by Lora Kirilova).


[edit] Making transistor behave again as a current-stable resistor

Investigating the "invented" transistor current source (by Lora Kirilova).


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