WBo2 2E0 Location Guide & Parts List

| Buy | WBo2 | 2E0 | DIY 2E0 Kit | Construction Guide | Location Guide | Schematics | Test Procedure

The DIY version of 2E0 was released at the start of 2005 and many people have build a working unit. We made small changes to the Rev-1 layout to :

• Fixed some component holes that were on the small (tight fit) side.
• Remove a couple of mm from the end of the main PCB so it fitted more easily into the case.
• Moved R413 from the end of U8 to the end of U1 (in the process of shortening the PCB).
• Added jumper labels for J4, J5 & J7, and moved the Rev ID text just a little left.

2E0 Engineering & Construction Images

• PCB references (images) :
  1. 2E0 schematic Guide [HTML]
  2. Overlay & parts IDs, Rev-1 with Rev-2 annotations - [GIF]
  3. Component values, Rev-1 with Rev-2 annotations [GIF]
  4. Top of main board, Rev-1 [JPG]
  5. Back of main board, Rev-1 [JPG]
• Main board : step 1, step 2, step 3, step 4.
• LED board : step 1, step 2, step 3.
• Extra Info :
  • 2E0 Shunts (JPG),
  • 2E0 Test Procedure (PDF),
  • 2E0 Construction Guide (HTML).
  • Parts Identification (see below).

Quick construction notes : VERY IMPORTANT (update 25 May 2005).

• Diodes are inserted so each diode's band mates with either the band or the circle on the PCB.
• Electrolytic capacitors are inserted so the white negative stripe aligns opposite the positive marking on the PCB.
• There are two 5 Volt Regulators (D2PAK size) soldered onto the back of the main PCB. Ensure the D2PAK's solder tab is well soldered to the PCB where there is no solder mask (refer to above image of back of PCB). Failure to solder the the D2PAK's tabs securely will blow up the processor when power is applied.
• The 3 mm Amber LED has a spacing of 7 mm from the base of the LED to the PCB (use inside caliper to measure) or from under the PCB to the top of the LED is 24 mm (use outside calipers)

2E0 Parts List

CICUIT BOARDS

CAPACITORS 50V CERAMIC

ELECTROLYTIC

5% RESISTORS 1W

5% RESISTORS 0.25 W

1% & 2% RESISTORS 0.25 W

DIODES / LEDS

ICs / TRANSISTORS

HEADERS / CONNECTORS

MISC

PARTS NOT INCLUDED

Depending on how you construct your WBo2 kit, some additional parts may be required.

• The 2E0 kit does not come with a Lambda sensor. You can use a number of sensor including the Bosch 7057, 7200 & 6066 sensors (Note 2E0 does not [yet] support the NTK L1H1 and L2H2 sensors). Note that the firmware must be updated when switching from one sensor family to the other (ie. NTK UEGO <-> Bosch LSU). Note also that the Bosch 31246 sensor is really an L1H1 sensor.
• Unless you buy the cable kit version of the 2E0 kit, you will NOT have a mating female plug (Y3F shown here) for the circular 8 pin male connector Y3. Y3F can be obtained from us by itself, or it's included with the cable kit.
• You also need a sensor connector kit that matches the type of sensor you have selected.

Parts Identification To view some of the components that people sometimes have difficulty identifying Click on the image. These include the inductors, the thermistor, and the 1% and 5% resistors. Note also that none of the 100 ohm resistors used in WBo2 need not be any more accurate than 5%.

Resistors are shown in ohms and an R (=1), k (kilo=1000) or M (Mega=1,000,000) indicates both the multiplier and the position of the decimal point. Examples are :

Capacitors are measured in micro Farads (μ = Greek mu = 10^-6 F), nano Farads (n = nano = 10^-9 F), and pico Farads (p = pico = 10^-12 F). If the value is not clearly shown in μF then it will normally be measured in picro Farads (pF) in the form of vvm where vv is the value and m is the multiplier as a power of 10. Examples are :

Other common values are : 105 = 1.0 μF (1000 nF, or 1,000,000 pF), 104 = 0.1 μF (100 nF, or 100,000 pF), 103 = 0.01 μF (10 nF, or 10,000 pF), 102 = 0.001 μF (1 nF or 1,000 pF), 101 = 0.0001 μF (100 pF), 100 = 0.00001 μF = (10 pF)

Resistors in beige or brown (generally) have a tolerance of 5%, and resistors in light blue or green have a tolerance of 1% and the two types should not be mixed. Capacitors are shown in μF (micro Farad), nF (nano Farad) and pF (Pico Farads).