Evil Mad Scientist Three Fives Discrete 555 Timer Kit Assembly Instructions

Kit Assembly Instructions
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How to Solder Components to the Circuit Board
0. For resistors only, pre-bend the leads as shown
1. Insert a component at its given location.
Push it down gently, as far as it will go.
(For resistors: flush. For transistors: not so flush.)
2. Gently bend its leads out, up to 45° ,
to hold it in place while you solder.
3. One at a time, from the back side, solder the leads of
the component to the circuit board.
i. The tip of your iron needs to be shiny (tinned) for soldering
to work well. If it isn't, melt some fresh solder against it and
quickly swipe it clean against a wet sponge.
ii. Place the solder against the joint that you wish to connect.
iii. Touch the iron to the solder and joint for about one second.
Count it out: "one thousand one."
iv. The solder should melt to the joint and leave a shiny
wet-looking joint. If not, let it cool and try again.
4. From the bottom side, clip the excess leads, close to the board.
(But, not so close that you're clipping the board itself.)
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"Three Fives" Discrete 555 Timer Kit
Re-create one of the most classic, popular,
and all-around useful chips of all time.
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Required Tools and Materials (not included with kit):
1. Soldering iron
Recommended: 25-50 W pencil type, e.g., Weller WLC100
2. Solder
Recommended: Rosin-core solder, 0.020 - 0.035" diameter
3. Small "flush" wire clippers
Recommended: Sears Craftsman #45660 diagonal cutting pliers
4. Phillips head screwdriver, "#2" size
3. Solder!
Kit Contents:
1. Circuit board with threaded inserts
2. Transistors: • 2N3904 (13 pcs. )
• 2N3906 (13 pcs. )
3. Aluminum "IC Legs" stand (two halves)
4. Resistors: • 4.7 k (7 pcs. )
• 10 others in resistor wallet
5. Thumbscrews with color-coded caps:
• Gray (6 pcs.)
• Red, Black (1 each)
6. Mounting screws & spacers for
"IC Legs" stand (6 pcs. each)
1. Insert!
v 2.1
2. Bend!
45°, max
4. Clip!
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