This is an old revision of the document!
Unfortunately, there are many errors or discrepancies between the various resources available for this project. Eventually, they will all be listed here; if you can then update one of the resources (schematic, PCB layout, assembly directions), please do so and then remove the error from this list.
Forum threads: (extract info from thread, place on this page and remove thread from list:)
Part | Incorrect | Correct | Remarks |
---|---|---|---|
C20 | 160pF, do not place | 390-550pF, placement recommended. | |
C40 | 68pF | ? | Sirenza datasheets say 1-2pF, not clear if this is an error or not |
C50 | ? | 1 uF 1206 | |
C51 | ? | .1 uF 1206 | |
C52 | ? | 1 uF 1206 | |
C53 | ? | .1 uF 1206 | |
C63 | ? | 1pF 0603 | |
C77 | ? | 4.7uF or 1uF, 0603 | Filter cap; 4.7uF part is difficult to get in 0603, 1uF is ok |
C80 | 20pF | 22pF | Substitute to save money by combining order with other 22pF caps |
C81 | 20pF | 22pF | Substitute to save money by combining order with other 22pF caps |
C83 | ? | .1uF ? | not listed in instructions |
C84 | ? | .1uF ? | not listed in instructions |
IC2 | LM2733X | LM2731Y | Either part will work, but the 33X is not recommended for supplies less than 16v |
L1 | 15 uH | 7.3 uH | Only change if using LM2731Y |
L5 | ? | 1K resistor | |
L6 | ? | 1K resistor | |
R3 | ? | 39K | |
R4 | ? | 12K | |
R8 | ? | do not place | not usually necessary |
R9 | ? | do not place | not usually necessary |
R12 | ? | 100 ohms | not a critical value (instructions say 68 ohms) |
R13 | 100K | 63K | Value may vary to adjust VCO DC Offset gain |
R15 | 100K | 33K | Value may vary to adjust VCO DC Offset gain |
R27 | 0 ohms | ferrite bead | |
R28 | 0 ohms | ferrite bead |