Got necessary parts to start Pre-amp

design

Built Pre-amp with given schematic

Adjusted the DC voltages as needed

Made adjustments to circuit as needed

Added two capacitors

Removed and replaced the resistor

(R6) with a potentiometer

After adjustment were made

Todd did his testing process

o Got the devices for measurements

o DMM, analog meter, oscilloscope etc.

o Followed the measurement ruleso AC measurements:

o Frequencies

oGiven

V(in) and V(out)

Voltage gains

Av(dB)

o DC measurements:

oLow currents

oPositive

oNegative

oVoltage

oInput

oOutput

oPower

• Oscillation occurred

• Added capacitors as stated in procedure

• Backup to reduce the noise level

• Used a common ground

• Another noise reduction

• Once circuit was tested and the noise

reduction at none• Ready to combine with Power Amp

0

1

2

3

4

5

6

7

8

100Hz 500Hz 1kHz 2kHz 5KHz 10KHz 15KHz

Av(

gain

)

Frequence Response by Av (gain)

Av (gain)

-10

-5

0

5

10

15

20

100Hz 500Hz 1kHz 2kHz 5KHz 10KHz 15KHz

Av

(dB)

Frequency Response for Av (dB)

Av (dB)

Started Power Amp with given schematic

Built in a non convenient way

Circuit didn’t work

Heat sinks were red hot

Capacitor was shorted out

Resistor was heating up

Rebuilt circuit

Proper way

Tested circuit

“No problem” and ready to be tested

Same DC

measurements:

High currents

Positive

Negative

Similar Voltage

Input

Output

Power doubled

Same AC

Measurements:

Frequencies

given

V(in) and V(out)

Voltage gains

Av(dB)

o Got same necessary devices for measurements

o DMM, analog meter, oscilloscope etc.

oFollowed the measurement rules

There was a sausage AC output displayed

Even though a clear AC input was

displayed

Double checked circuit for no loose parts

None found

Guided and assisted to fix problem

AC measurements can be made