Vectronics VEC-221K - Manual (Page 15)

VEC-221K Instruction Manual CW Memory Keyer Kit
10
! ! C7 0.1 uF ceramic disc capacitor (.1 or 104)
! ! C8 0.1 uF ceramic disc capacitor (.1 or 104)
! ! C9 0.1 uF ceramic disc capacitor (.1 or 104)
! ! 10. Locate the 0.47 uF electrolytic capacitor. Install and solder at location
C16 (observe polarity).
! ! 11. Locate the two 10 uF electrolytic capacitors. Install and solder at the
following locations (observe polarity):
! ! C17 10 uF (observe polarity)
! ! C19 10 uF (observe polarity)
! ! 12. Locate the 100 uF electrolytic capacitor. Install and solder at location
C18 (observe polarity).
! ! 13. Locate the 78L05 +5-Vdc voltage regulator IC. Form the leads as
shown below to allow the device to fit at location U4. Make sure the
regulator is properly keyed to the silk-screened outline; if installed
incorrectly, damage to the PIC processor is certain when power is
applied. Install and solder.
78L05
! ! 14. Find the 2N7000 field-effect transistor. Position the body outline to
correspond the silk-screened legend at Q1. Install and solder.
! ! 15. Find the red LED. Note that the LED has a flat edge corresponding to
the shorter lead. Make sure that the LED is properly keyed to the silk-
screened outline at CR1. Install the LED leads until the shouldered
stops on the leads are flush to the PC board Bend the leads so the
LED is flush with the edge of the PC board. Solder.
! ! 16. Find the 4 MHz crystal. Install and solder at location Y1.
! ! 17. Locate the two 8-pin IC sockets. Note that the socket is “keyed”, and
should be installed with its key aligned to the silk-screened outline on