Instruction manual

STC1• 11
diodes in the kit. Since the appearance of this part is likely to change as we
order these parts in the factory, this is how we will need to identify them.
Make sure the banded end of the diode is installed in the same direction as
shown in the parts layout diagram.
❒ 10. Using a piece of scrap component lead from the parts you have
installed earlier, install JMP3, a jumper. Jumpers act as “bridges” over other
circuit paths on the PC board, allowing for a better routing of the board.
❒ 11. Again using a piece of scrap component lead, install JMP1, another
jumper.
❒ 12. Install R47, a 100 ohm resistor (brown-black-brown).
❒ 13. Install the 74HC74 dual type D flip flop. Be careful to observe the
correct orientation of this device before you begin soldering. Notice the
notch indicated in your parts layout diagram. This notch corresponds to pin
1 of the IC, and your part should be installed in the same orientation as
shown. Pin 1 may also be indicated by a white dot on the IC or a dimple.
Make sure all 14 pins are through the PC board before soldering.
❒ 14. Install R21, a 15K ohm resistor (brown-green-orange).
❒ 15. Install R2, another 15K ohm resistor (brown-green-orange).
❒ 16. Install R1, a 15K ohm resistor (brown-green-orange).
❒ 17. Install R3, a 47K ohm resistor (yellow-violet-orange).
❒ 18. Install R20, a 15K ohm resistor (brown-green-orange).
❒ 19. Install R22, a 47K ohm resistor (yellow-violet-orange).
❒ 20. Install R48, a 1K ohm resistor (brown-black-red).
❒ 21. Install R45, a 100K ohm resistor (brown-black-yellow).
❒ 22. Install R40, a 270 ohm resistor (red-violet-brown).
❒ 23. Install R43, a 1K ohm resistor (brown-black-red).
❒ 24. Install R46, another 1K ohm resistor (brown-black-red).
❒ 25. Using a scrap piece of component lead, install JMP4, a jumper.
❒ 26. Install U1, a LM347 quad op-amp. Make sure all 14 pins are through the
board before soldering, and that the notch or dot indicating pin one of the IC
is in the same orientation as shown on the parts layout diagram. Double
check your work when you are done.
❒ 27. Install R50, a 1K ohm resistor (brown-black-red).