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<\/a><\/p>\nI built several boards to test the various combinations that this flexible CCS board offers:<\/p>\n
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- Top MOSFET (DN2540\/IXTP08N100D<\/a>) mounted close to the edge to allow the CCS to be bolted to a big heatsink. Alternative a small heatsink over the TO-220 can be used for 1-2W dissipation.<\/li>\n
- The lower device can be multiple options depending on the target use\n
- \n
- High bandwidth and low noise CCS for phono stages (up to 20mA): \n
- \n
- 2SK170 (TO-92) <\/li>\n
- BF862 (SMD)<\/li>\n
- Alternatives to BF862 due to EOL: 2SK3557 and CPH3910<\/li>\n<\/ul>\n<\/li>\n
- High bandwidth and general CCS use with jFETs:\n
- \n
- J310<\/a> (<60mA) – TO-92<\/li>\n
- J112 (<20mA) – TO-92<\/li>\n<\/ul>\n<\/li>\n
- Protection zener for low voltage devices (jFETs)<\/li>\n
- High-current CCS\n
- \n
- DN2540<\/a> (<120mA) – TO-92<\/li>\n
- DN2540<\/a> (<170mA) – SOT-89 (mounted on reverse PCB side)<\/li>\n
- DN2540<\/a> (<500mA) – TO-220<\/li>\n
- BSP129<\/a> (<250mA) – SOT-223 (mounted on reverse PCB side)<\/li>\n
- BSP149<\/a> (<660mA) -SOT-223 (mounted on reverse PCB side)<\/li>\n<\/ul>\n<\/li>\n
- Gate stoppers can be either through-hole or SMD (mounted on reverse PCB side)<\/li>\n
- Mu-follower output for low output impedance configuration<\/li>\n
- Current measurement resistor: 1 or 10\u03a9<\/li>\n
- Current setting arrangement:\n
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- Fixed resistor<\/li>\n
- Multi-turn trimpot and series resistor (optional)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
Below is the diagram of the CCS board:<\/p>\n
- DN2540<\/a> (<170mA) – SOT-89 (mounted on reverse PCB side)<\/li>\n
- J310<\/a> (<60mA) – TO-92<\/li>\n
- The lower device can be multiple options depending on the target use\n