Gordon Robertson
- Joined Aug 11, 2015
- 1
Thanks SgtWookie, this was a real head scratcher for me to until I read your post.When the pot VR1 gets worn/dirty/noisy and the wiper breaks contact with ground, the current will flow through VR1 from one end to the other through the base of the transistor, and pull the output down to roughly 2v. That's better than having the output float high.