Ramsey Electronics STC1 Instruction Manual - page 11
STC1
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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.
9A. We’ve added a part to your kit to make it operate more efficiently. Take
the .1uF capacitor (marked 104) and place it across D5, the diode you just
installed. The part must be in parallel with D5 so you can slide the leads of
the cap under the already soldered leads of D5 and then solder the two sets
of leads together.
10. Using a piece of scrap component lead from the parts you 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 U6, 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