Electronics III Midterm

What are the benefits of integrated circuits?

smaller, faster, fewer connections, easier

What is the reason of choosing discrete over ICs?

sound quality

What were op amps originally used for?

Computers

What is the gain of a voltage follower amp?

1

What kind of filter is created with a capacitor in parallel with R2?

Low pass

What kind of filter is created with an inductor in paralell with R2?

High Pass

What are the advantages of a butterworth filter?

Slope and cutoff frequency easy to change

Steep slope

Large Q

What is a butterworth filter?

Capacitors added to the op amp circuit

What does C102 do

Get rid of above audio frequencies

R102 and R104 are 6.8kOhms because

it prevents too much current from flowing when there is a short

What component(s) has(have) the largest part in setting the differential mode input impedance?

R103

What is the purpose of C104 and C105?

block dc

What are the purposes of D101-D104?

limit spikes from +/- 48V to +/- 15.5V

Phantom power would be best described as

common mode

Sound from the microphone would best be described as .

differential mode

Noise added as the signal is transferred through a microphone cable would best be described as .

common mode

Which of the following has the function of setting the common mode input impedance for above audio frequencies?

C101

Which of the following has the function of setting the common mode input impedance for audio frequencies?

R113

What is the range of voltage mic level?

0.775mVrms - 77.5mVrms

What are the five steps of analyzing circuits?

1. Identify and indicate voltage rails and ground connections on schematic

2. Identify components and their basic properties

3. Identify sub-circuits and their basic properties

4. Trace signal paths and current paths and indicate signal polarity

5. Analyze with input signal

What is the function of R111?

Sets the maximum gain of the preamp.