1. ELEC-225 and ENGI-242 The Pre-Amp and Power Amp Projects By Todd, David, Dan and Joseph

3. Built Pre-amp with given schematic

4. Adjusted the DC voltages as needed

5. Made adjustments to circuit as needed

6. Added two capacitors

7. Removed and replaced the resistor (R6) with a potentiometer

8. After adjustment were made

10. DMM, analog meter, oscilloscope etc.

11. Followed the measurement rules

12. AC measurements:

13. Frequencies

15. Low currents

16. Positive

17. Negative

18. Voltage

19. Input

20. Output

22. Added capacitors as stated in procedure

23. Backup to reduce the noise level

24. Used a common ground

25. Another noise reduction

26. Once circuit was tested and the noise reduction at none

28. Pre-amp Graph #2: Frequency by Av(dB)

30. Built in a non convenient way

31. Circuit didn’t work

32. Heat sinks were red hot

33. Capacitor was shorted out

34. Resistor was heating up

35. Rebuilt circuit

36. Proper way

37. Tested circuit

39. DMM, analog meter, oscilloscope etc.

40. Followed the measurement rulesSame 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)

41. Error Note: Troubleshooting Part 2 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

42. Power Amp Graph #1: Frequency by Av(gain)

43. Power Amp Graph #2: Frequency by Av(dB)

44. Amplifier Combination Part #1: Graph

45. Amplifier Combination Part #2: Video