Ramsey Electronics SHA2 - Manual (Page 15)

SHA2 • 15
Install C14, 100nF ceramic disc capacitor (marked 104).
Install R7, a 2 ohm resistor (red-black-gold).
Install C23, 100pF ceramic disc capacitor (marked 100, 100K, or 101). It’s
tucked in between U2 and U4.
Install C27, 100nF ceramic disc capacitor (marked 104).
Install R14, 2 ohms (red-black-gold).
Install C12 and C24, both 220uF electrolytic capacitors. These are slightly
larger than the 10uF caps you’ve been installing but the same rules apply
as to polarity. Follow the stripe or band for the negative lead and place the
longer positive lead in the hole marked with a “+” sign.
Now we’ll move back up and toward the middle of the board. Hopefully you’re
not having too much trouble seeing where the parts are supposed to be
placed.
Install C4, 10uF electrolytic capacitor. Please orient it properly. Thanks!
Install D5, 1N4000 series diode, another polarity sensitive component.
The white band on the part and the white band shown on the silkscreen
need to line up with each other. Solder as usual.
Install R17, 560k ohms (green-blue-yellow).
Install R15, a 100k ohm resistor (brown-black-yellow).
Install C33, 470uF electrolytic capacitor. Remember the rules for
electrolytic caps and follow the “+” sign.
Install D1, 1N4000 series diode. The white band shows the way to place
the part.
Install VR1, the 7810 10V voltage regulator. The writing on the part should
face the outside of the PC board. Bend the center lead out so that the part
fits into the holes and solder it in.
Install D2, 1N4000 series diode. Again, follow the white band on the board
and on the part for orientation.
Install R3, 1 M ohm resistor (that’s a million ohms!) (brown-black-green).
While you’re clipping leads on the back side of the board you can also
check the solder joints and immediately touch up any that don’t look
right. You’re already looking at the connections closely and it’s a good
time to spot mistakes!