Audioguru again
- Joined Oct 21, 2019
- 6,674
You are lucky to be using a BC547B that has its beta selected to be within 200 to 450 when its collector current is 2mA. A basic BC547 has a beta between 110 and 800. When you buy some, they can have a beta anywhere in between.
If you reduce the 1M values of the biasing resistors then the circuit will work nearly the same with a transistor having any beta within the range without customizing the resistor values to match the actual beta.
If you reduce the 1M values of the biasing resistors then the circuit will work nearly the same with a transistor having any beta within the range without customizing the resistor values to match the actual beta.