This page explains how to complete - or check completion - of GenBoard/VerThree WBO2 HW
See the schematic and layout on GenBoard/Manual/InitialTesting/VerThree
Needed components
You probably want to get 1st WideBand channel (pump1, nernst1, heater1) get working 1st.
v3.2 contains
- everything for the common section
- everything for the 1st channel (except the Q18 WBO2 heater FET)
- everything except R103 (and the Q14 WBO2 heater FET) from the second nernst channel (reason below).
Therefore most v3.2 users only have to solder Q18 (to complete 1st WBO2 channel) and can proceed to the testing steps. Please take a few minutes to review the components anyway.
Common parts: needed for either 1st or 2nd WBO2 channel
- PUMP- / 2v Section (TODO: split this to 2 sections!!!) - needed for both 1st and 2nd WBO2 channel
- 2x LM 324D U17, U7
- 18k R104
- 33k R44
- 75K R129
- 270 R127 (You must solder this, or at least check it!!!)
- 22K R25
- 0.1uF C21
- 0.1uF C26
- 3x 0.22uF C50, C52, C53 (Easier to just place 1*1..2.2 uF)
- 0.1uF C51
Needed for WBO2 1st channel
- PUMP1+
- Pump1Filt: R54,C86 an RC filter (270..510 Ohm * 2u2) before the OPA was removed from v3.0 layout (unfortunately). We added back at v3.1, soldered on in factory. It is recommended to make that (LM324 OPA is not fast enough to follow the 16usec period squarewave precisely). It can be done without a tracecut, but unsoldering r... (OC3A..OPA+) is needed.
- 10k R132
- 4x 100k R32, R35, R46, R49 (marked 104 or 1003)
- 510 R51
- 0 R48 (v3.0 only)
- 0.1 uF C81 (on back side of board)
- 0.22uF C54
- NERNST_CELL1
- D44
- 10k R98
- 270k R99
- 75k R102 This might be missing on v3.1, cause the NBO2 setup likes *1 amplification (voltage-follow mode, where R102 missing), and it's easier to solder a resistor than unsolder
- 10k R145
- 10k R144
- 0.22uF C66
- 1M R146
- HEATER1
- 1k R134
- 10k R133
- Q18
Not needed for 1st WBO2 channel
- HEATER2
- 1k R120
- 10k R119
- Q14
- NERNST_CELL2
- D43
- 10k R143
- 270k R124
- 75k R103 this component is deliberately left out from v3.2, so this channel can be used as a x1 amplification (voltage-follow mode) NBO2 channel.
- 10k R125
- 0.1 uF C83
- 10k R137
- 0.22uF C62
- 1M R139
- PUMP2+
- See PUMP1Filt: R55,C87
- 10k R140
- 4x 100k R28, R31, R33, R34
- 510 R29
- 0 R30
- 0.22uF C22
absolutely important to check
It is extremely bad practice to save a few minutes by skipping the checking of 20 components, but at the very minimum:
- R127 [Placement]
- R51
- 4x 100k R32, R35, R46, R49: if these 100k resistors are soldered, you can see that they were soldered manually on v3.1, matched to appr. 0.1% (overprecise). Automatically populated on v3.2. Solder them if they are not already soldered. [Placement]
- C81
![[Placement]](http://vems.hu/www.vems.co.uk/VEMS/WBOne/R127.jpg){kind=link}
![[Placement]](http://vems.hu/www.vems.co.uk/VEMS/WBOne/R51R32R35R46R47R51.jpg){kind=link}
GenBoard/Manual/WBSensorControllerCompleting/OldBoards - before v3.1
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