Difference between revisions of "Filter Modulator ver2"
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PCBs supplied after 28 February 2017 are Version 2 and include the modifications to improve spectral performance. | PCBs supplied after 28 February 2017 are Version 2 and include the modifications to improve spectral performance. | ||
| − | + | [[File:F-M V2 Top.jpg|400px]][[File:F-M V2 U-side.jpg|300px]] | |
| − | + | Notes on the pictured example: Q01 not fitted (out-of-stock at the time), L50 replaced by hand-wound inductor (original lost in carpet) and R50A bridged to allow 5V input on J51. | |
| + | General notes: Do not fit L10 or C11; they are not required if using a linear regulator. R33, R34 and R45 are not fitted as they are not required. | ||
The Version 2 the parts list and schematics are available for download: | The Version 2 the parts list and schematics are available for download: | ||
Revision as of 20:14, 28 March 2017
Board information - version 2
PCBs supplied after 28 February 2017 are Version 2 and include the modifications to improve spectral performance.
Notes on the pictured example: Q01 not fitted (out-of-stock at the time), L50 replaced by hand-wound inductor (original lost in carpet) and R50A bridged to allow 5V input on J51.
General notes: Do not fit L10 or C11; they are not required if using a linear regulator. R33, R34 and R45 are not fitted as they are not required.
The Version 2 the parts list and schematics are available for download:
Although the board includes the options to fit a switching voltage regulator (an R78E5), the regulator introduces spurs at -50dB on the output spectrum , so is not the recommended option.
DO NOT FIT L10 or cut the track beneath it as it does not suppress the spurs and introduces voltage drop, which upsets the modulator balance.