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av:sega_mark_iii_rgb_amp [2014/02/01 10:31]
ApolloBoy Alternate amp added
av:sega_mark_iii_rgb_amp [2014/05/14 16:06]
ApolloBoy Clarification on sync
Line 12: Line 12:
  
 ====Alternate Circuit==== ====Alternate Circuit====
-You can also substitute the above amp with one based around the THS7314 chip. The amp design is based on the one [[http://​www.mmmonkey.co.uk/​ntsc-nintendo-64-rgb/​ |found here, which was originally designed for the N64]]. The RGB outputs ​are tapped directly from the VDP (these outputs are also marked on the motherboard),​ while 5V and ground can be pulled from the 7805 regulator. The resulting image will be very bright, so you may want to replace the 75 ohm resistors with ones of a higher value. For sync, you can use composite video, or you can substitute the THS7314 with a THS7374 to amplify ​the composite sync output in addition to the RGB signals.+You can also substitute the above amp with one based around the THS7314 chip. The amp design is based on the one [[http://​www.mmmonkey.co.uk/​ntsc-nintendo-64-rgb/​ |found here, which was originally designed for the N64]]. The RGB inputs for the THS7314 ​are tapped directly from the VDP (these outputs are also marked on the motherboard),​ while 5V and ground can be pulled from the 7805 regulator. The resulting image will be very bright, so you may want to replace the 75 ohm resistors with ones of a higher value. ​Also make sure to cut the traces for the RGB outputs on the AV jack before wiring up the amplified outputs! ​For sync, the pre-existing ​composite sync signal will work fine, although ​the composite video signal will suffice as well.
  
 As with the amplifier design above, this circuit may also work with the later version of the SG-1000 II. As with the amplifier design above, this circuit may also work with the later version of the SG-1000 II.
  
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-Many thanks to [[nfg:​backup_technique_and_game_lab|Backup Technique]] (バックアップ括用テクニック) magazine (Volumes 8 + 9), from whence this diagram came.+Many thanks to [[nfg:​backup_technique_and_game_lab|Backup Technique]] (バックアップ括用テクニック) magazine (Volumes 8 + 9), from where the diagram ​for the first circuit ​came.
  
 Thanks also to [[http://​tripoint.org/​kevtris/​|Kevin Horton]], for helping fix the diagram, which was incorrect. Thanks also to [[http://​tripoint.org/​kevtris/​|Kevin Horton]], for helping fix the diagram, which was incorrect.
 
 av/sega_mark_iii_rgb_amp.txt · Last modified: 2019/08/27 20:45 (external edit)
 
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