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The latest version (REV-D) of the Build Document is now complete. Please find the PDF file below.
As before, I cannot guarantee the document is totally error-free, so please provide feedback if you find something wrong. As you will be aware, it's always difficult to check your own work.
The updates took longer than expected due to other commitments, and re-tracking certain sections of the PCB were time consuming.
The board size is exactly the same as before, but with the following modifications:
1) Added a diode (D10) in series with the MOSFET.
2) Added the sync capacitor (C20) missing from REV-C.
3) Added decoupling capacitors (C21 & C22) to U6 and U7 (sample pulse generators).
4) Re-routed the -5V rail so that the opamps are fed from a different branch than the sampling gates and audio VCO.
5) Increased resistor, capacitor and diode pad diameters to 70mil, with a 39mil (1mm) hole size.
25-Feb-2015 - Build Document updated to fix an alignment error in Fig.1.
26-Feb-2015 - Build Document updated to correct error in Parts List, and change REV-C in footer to REV-D.
28-Feb-2015 - Build Document updated to add C20 (100pF) to Parts List.
12-July-2015 - Build Document updated to correct battery connection error in Fig.18.
14-March-2018 - Replaced Gerber zip attachment due to a corrupted drill file.
As before, I cannot guarantee the document is totally error-free, so please provide feedback if you find something wrong. As you will be aware, it's always difficult to check your own work.
The updates took longer than expected due to other commitments, and re-tracking certain sections of the PCB were time consuming.
The board size is exactly the same as before, but with the following modifications:
1) Added a diode (D10) in series with the MOSFET.
2) Added the sync capacitor (C20) missing from REV-C.
3) Added decoupling capacitors (C21 & C22) to U6 and U7 (sample pulse generators).
4) Re-routed the -5V rail so that the opamps are fed from a different branch than the sampling gates and audio VCO.
5) Increased resistor, capacitor and diode pad diameters to 70mil, with a 39mil (1mm) hole size.
25-Feb-2015 - Build Document updated to fix an alignment error in Fig.1.
26-Feb-2015 - Build Document updated to correct error in Parts List, and change REV-C in footer to REV-D.
28-Feb-2015 - Build Document updated to add C20 (100pF) to Parts List.
12-July-2015 - Build Document updated to correct battery connection error in Fig.18.
14-March-2018 - Replaced Gerber zip attachment due to a corrupted drill file.