Voltage Follower

[alfa88]

I'm finding it hard to believe this circuit isn't working. It's almost verbatim to what's on the datasheet. Without the transistors there is the full adjustment range (1 to~14V). With the transistors the range is 12 to ~14V. I left the capacitors out for ease of experimenting.

UPDATE:
My bad. That is a circuit extrapolated from LM317 datasheet. For some reason there is no high current, adjustable application for the 337s. Curious. Also in the 317 a LM195 is used in place of the output transistor and the other transistor is a PNP. I'll experiment with my new found insight and see where it leads me.

 

[duke37]

The transistors will give extra gain. Without the capacitors, this may be enough to set the circuit into oscillation.