Stages Two and Three: Voltage Derived

  • Thread starter Thread starter IronaSona
  • Start date Start date
  • Tags Tags
    Voltage
Join the discussion
Registration is free. Ask a follow-up in this thread, or start your own.
1 reply · 1K views · last reply
IronaSona
Messages
38
Reaction score
7
Homework Statement
asd
Relevant Equations
ad
So i want to make a Stage Three: Two Stage Amplifier with Voltage Derived - Parallel Applied Feedback and a Stage Two: Two Stage Amplifier with Voltage Derived - Series Applied Feedback

But am not sure how to layout it out correctly because i have never done this before so i layout'ed it out how i would think it would look like :
 
Attachments
  • Circuit schematic of a two-stage transistor amplifier with two BC846B NPN transistors Q1 and Q2, resistors R1 to R8, capacitors C1, C2, C3 and C5, and input source V1, with feedback path from the output back to the base of Q1.
    Two Stage Amplifier with Voltage Derived -parralel applied feedback.PNG
    1.8 KB · Views: 172
  • Circuit schematic of a single-transistor common-emitter amplifier with Q1 BC846B, R1 775, R2 800, R3 3k, R4 2.9k, C1 0.005µF, C5, a Vcc supply, a sine source V15749 SINE(0 5 1k) AC 5, and nodes labelled Out1 and 2Out.
    Two Stage Amplifier with Voltage Derived -Series applied feedback.PNG
    1.4 KB · Views: 177
Physics news on Phys.org
I'm not all that clear on what you are asking and I'm no expert, but since you have no replies, I'll have a stab.
In your first diagram, I can see voltage series feedback around the first transistor, but no two stage FB.

Similarly in your second I can see single stage voltage series FB by R3.
I've added typical single stage voltage parallel FB in green.

If you'd like to explain your issues a bit more, I'll try to help if I can

Two electronic circuit schematics: left, a two-stage BC846B transistor amplifier with AC coupling capacitors and resistors labelled R, with a note saying no AC feedback in stage 2; right, a single-stage BC846B amplifier with output voltage fed back in parallel with input through Rf and Cf, and resistor values 775, 800, 3k, 2.9k.