mbhp_genesis_ls
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mbhp_genesis_ls [2016/01/29 18:07] sauraen |
mbhp_genesis_ls [2016/11/22 19:22] (current) sauraen [Parts List] |
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| - | ====== TODO under construction! ====== | + | ====== MBHP_Genesis_LS ====== |
| - | ===== Buffer circuit ===== | + | This is the schematic for the breakaway MBHP_Genesis_LS board included with the MBQG_FP front panel board. This should be sufficient for anyone to build a copy of this circuit on prototype board. |
| + | {{http://midibox.org/forums/uploads/monthly_2016_04/large.mbhp_genesis_ls.png.9b8e551b7d5d2244df873eeb7107f1e0.png}} | ||
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| + | ===== Explanation ===== | ||
| When using the MBHP_Genesis module with a MCU supplied at less than 5V, especially when using several modules in parallel, a buffer circuit will be required between the MCU and the modules. This is a very simple circuit that consists of two 20-pin 74HCT series ICs and two power supply bypass capacitors, and can easily be built on prototyping board. | When using the MBHP_Genesis module with a MCU supplied at less than 5V, especially when using several modules in parallel, a buffer circuit will be required between the MCU and the modules. This is a very simple circuit that consists of two 20-pin 74HCT series ICs and two power supply bypass capacitors, and can easily be built on prototyping board. | ||
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| Both buffers must be powered from +5V, not +3.3V or whatever the MCU uses. In addition, the MCU must be tolerant of 5V signals being applied to its I/O pins (the CORE_STM32F4 module is tolerant)--otherwise it will damage the MCU! | Both buffers must be powered from +5V, not +3.3V or whatever the MCU uses. In addition, the MCU must be tolerant of 5V signals being applied to its I/O pins (the CORE_STM32F4 module is tolerant)--otherwise it will damage the MCU! | ||
| - | Post on the forum or PM me if this is confusing and you want me to draw a schematic. | + | ===== Parts List ===== |
| - | + | ^ Qty ^ Ref. Deg. ^ Part Name ^ Mouser Part Number ^ Description / Notes ^ | |
| - | A MBHP_Genesis_LS board is included as a breakaway portion of the MBQG_FP front panel board, so anyone purchasing a front panel board gets the level shifter board for free. No other manufactured board will probably be produced for it. | + | | 1 | U101 | 74HCT245 | 595-SN74HCT245N | Bidirectional buffer chip | |
| + | | 1 | U102 | 74HCT541 | 595-SN74HCT541N | Buffer chip | | ||
| + | | 2 | [U101], [U102] | 20-pin 0.3" DIP socket | 571-1-2199298-6 | Socket for chips | | ||
| + | | 2 | J101, J102 | 10x2 pin header, 0.1" pitch | 649-68691-420HLF | Connectors to core and MBHP_Genesis module | | ||
| + | | 1 | J103 | 2x1 pin header, 0.1" pitch | 571-826936-2 | Connector for +5V power from core | | ||
| + | | 2 | C101, C102 | 0.1 uF | 21RZ310-RC | Power supply filtering capacitors for chips (place one next to each chip's +5V connection) | | ||
| + | | 1 | C103 | 10 uF | 140-REA100M1HBK0511P | Power supply filtering capacitor for board | | ||
| + | | 1 | --- | --- | e.g. 854-SB4 | Prototyping board to build circuit on | | ||
mbhp_genesis_ls.1454090827.txt.gz · Last modified: 2016/01/29 18:07 by sauraen
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