NORCAL NC2030 Manual page 4

Figure 8. Layout of the power supply and the first three bags ................................................................ 17
Figure 9. Layout of bags # 3 to # 6 .......................................................................................................... 18
Figure 10. Contents of bags #7 - #9.......................................................................................................... 19
Figure 11. Completed Switching PS with Temporary 9v Power Connection and 100 ohm 3.3v Dummy
Load .................................................................................................................................................. 23
Figure 12. Board layout of the switching power supply......................................................................... 23
Figure 13. Switching supply built up....................................................................................................... 24
Figure 14. Orientation of U1. Mount with the markings "AANY" upside down as shown................... 24
Figure 15. PS with 0.1 Caps, 47 uH inductors, Schottky diodes, and Switching IC ............................... 25
Figure 16. PS and Electrolytic Caps Polarity Details .............................................................................. 25
Figure 17. L2 mounting details................................................................................................................ 26
Figure 18. L2 details. After first 24 turns, add a twisted loop for later center tap. Add 27 more turns
after this. ........................................................................................................................................... 27
Figure 19. Form 1N4001 Diode as Shown .............................................................................................. 27
Figure 20. 100 ohm Temporary 3v Load Resistor Formed as Shown ..................................................... 27
Figure 21. 1N4001 Mounted and 9v Battery Clip Connected ................................................................. 28
Figure 22. 3v Temporary 100 Ohm Load Resistor Connected to Bottom of Board................................ 28
Figure 23. Power Output Connection Details (Load resistor not shown)................................................. 29
Figure 24. Temporary 9v power connection and connections between switching supply and main board
........................................................................................................................................................... 30
Figure 25. Close up of power connections on the main board and switching supply, bypass caps, and
polarity diode .................................................................................................................................... 31
Figure 26. Location of the two 3v and 5v regulator sections................................................................... 31
Figure 27. Close up of first two 3v LDO regulators ................................................................................ 32
Figure 28. Parts layout of first two 2.9v LDO regulators. Note the black band orientation of the
electrolytic caps. ............................................................................................................................... 32
Figure 29. Location of the one 3v and two 5v LDO regulator sections................................................... 33
Figure 30. Installed parts for this section of LDO regulators. Note the black band orientation on the
electrolytic caps. ............................................................................................................................... 34
Figure 31. Ground reference for voltage measurements are upper 2 corners, the lower 2 are not
connected .......................................................................................................................................... 35
Figure 32. SCAF, HPF, Audio Amp, and Headphone driver section of the board.................................. 37
Figure 33. HPF, Audio Amp, Headphone Drivers portion ...................................................................... 37
Figure 34. Picture shows orientation of U11 with stripe on upper end. ................................................... 38
Figure 35. General location of the SCAF circuit ...................................................................................... 39
Figure 36. Close up component view of the SCAF section of the board.................................................. 39
Figure 37. U13 and D10 mounted. IC notch and D10 flat side in the vertical direction. ....................... 40
Figure 38. Location of the CW Keyer section of the board..................................................................... 42
Figure 39. Close up of the CW Keyer section. ........................................................................................ 42
Figure 40. Picture showing correct orientation of Norcal Keyer Chip (optional socket not shown) ...... 43
Figure 41. General Location of AFA circuit............................................................................................. 44
Figure 42. Close up view of the AFA section........................................................................................... 44
Figure 43. Correct orientation of both the 8 pin 12C508 AFA chip and 14 pin 74ACT00 ICs. ............. 45
Figure 44. Connect buttons keyer and AFA buttons S2 and S3 as shown................................................ 46
Figure 45. Prepare R88 100K Cw speed pot as shown. The left and middle terminals are connected to
the white lead .................................................................................................................................... 47
Norcal NC2030 v5 12-18-05
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