51 series microcontroller no PWM output function, can be used with the method of software timer output. On the occasion of the precision requirement is not high, very practical. See chart a circuit diagram, using high light every (6 N137) output, and the signal pour phase PWM.

89C51PWM\proteus仿真论坛.txt
........\PWMTEST\Last Loaded TEST.DBK
........\.......\proteus仿真论坛.txt
........\.......\STARTUP.A51
........\.......\STARTUP.lst
........\.......\TEST
........\.......\TEST.DSN
........\.......\TEST.hex
........\.......\TEST.M51
........\.......\TEST.Opt
........\.......\TEST.plg
........\.......\TEST.PWI
........\.......\TEST.Uv2
........\.......\TEST_Opt.Bak
........\.......\TEST_Uv2.Bak
........\.......\Text.ASM
........\.......\Text.LST
........\.......\Text.OBJ
........\.......\重要说明.txt
........\重要说明.txt
........\PWMTEST
89C51PWM

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