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R2XL1 • 12
R2XL1 ASSEMBLY
We will start with the lowest profile components first and then work our way
up to the largest. We do this to make assembly much easier since fitting a
short component between two big ones can be a real pain.
1. Install D1, one of the 1N4002 diodes (black body with white stripe
marked 1N4002). Note that diodes can only conduct in one direction so
part orientation is critical! The diode will have a white stripe indicating the
cathode end while the parts layout diagram shows a black stripe indicating
the same. Make sure and put the part in the same way as shown!
2. Install D3, another 1N4002 diode. Again pay close attention to orienta-
tion
3. Install D2, a 1N4002 diode. Check orientation!
4. Install D4, the last 1N4002 diode to make up the bridge rectifier to give
us out positive supply! Pay attention to orientation again.
5. Install D6, another 1N4002 diode. Orientation must be correct or we will
get no negative supply! Note how this is placed between two large capaci-
tors. Imagine trying to install this after the capacitors were soldered in.
Good thing you follow directions.
6. Install D5, the last 1N4002 diode. Again check orientation.
7. Install R8, a 1K ohm resistor (brown-black-red).
8. Install R9, a 100 ohm resistor (brown-black-brown).
9. Install R10, a 1K ohm resistor (brown-black-red).
10. Install C10, a 0.01 uF ceramic capacitor (marked 103).
11. Install R7, a 1K ohm resistor (brown-black-red).
12. Install C9, another 0.01 uF ceramic capacitor (marked 103).
13. Install U2, one of the LF347 quad opamps. Note that the layout dia-
gram shows a dimple on the end, this indicates pin 1. Your actual part
may have this same dimple or a dot near pin one. When installing ICs, it is
sometimes easy to have a pin bent underneath the part, make sure all
pins are through before soldering. Always double check your part’s orien-
tation before soldering all the pins!