Difference between revisions of "Filter Modulator ver2"
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*[[:File:Portsdown parts V2.xls| xls parts list file - includes the extra components for V2]] | *[[:File:Portsdown parts V2.xls| xls parts list file - includes the extra components for V2]] | ||
| − | *[[Media: | + | *[[Media:PdFM V2 SS.pdf|Board layout]] |
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*[[:Media:RBTVMOD 30 BLOCK.pdf| Block diagram]] | *[[:Media:RBTVMOD 30 BLOCK.pdf| Block diagram]] | ||
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*[[:Media:3 F-M Block.jpg| Block Diagram with IC Numbers]] | *[[:Media:3 F-M Block.jpg| Block Diagram with IC Numbers]] | ||
| − | *[[:Media: | + | *[[:Media:PdFM V2 Sht 1.pdf| Circuit schematic - part 1]] |
| − | *[[:Media: | + | *[[:Media:PdFM V2 Sht 2.pdf| Circuit schematic - part 2]] |
| − | *[[:Media: | + | *[[:Media:PdFM V2 Sht 3.pdf| Circuit schematic - part 3]] |
| − | + | 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. Fitting L10 (after cutting the track beneath it) does not suppress the spurs and introduces voltage drop, which upsets the modulator balance. | |
Revision as of 11:19, 22 March 2017
Board information - version 2
PCBs supplied after 28 February 2017 are Version 2 and include the modifications to improve spectral perfomance.
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. Fitting L10 (after cutting the track beneath it) does not suppress the spurs and introduces voltage drop, which upsets the modulator balance.