Page 1 of 1
biasing transistors
Posted: 11 Apr 2014, 21:23
by brendon79
I am going to build the 18V power boost with b169c. see attachment I have read that this circuit works best when the collectors are biased to 9V ( sound right??)
my question is which resistors would you tweak to bias the collector voltage for t2 and t3? (r6 and r 14) sorry its been a while since I too a electronics class
Re: biasing transistors
Posted: 16 May 2014, 23:59
by DrNomis
brendon79 wrote:I am going to build the 18V power boost with b169c. see attachment I have read that this circuit works best when the collectors are biased to 9V ( sound right??)
my question is which resistors would you tweak to bias the collector voltage for t2 and t3? (r6 and r 14) sorry its been a while since I too a electronics class
You just need to tweak R6, R12, and R13 to get t2 and t3 biased correctly, if you're running the circuit off +18V, you need to bias the transistors to +9V (half the supply voltage), this ensures that the transistors will produce the maximum signal swing without clipping, normally this circuit is designed to run on +9V so the transistors would have been biased for 4.5V on their collectors.......
