流电路后面的滤波电路中需要一个较大容量的电解电容进行滤波，一般采用2200uF/25V的就可以-flow behind the circuit filter circuit needs a larger capacity electrolytic capacitor filter generally use the 2200 can uF/25V

电容充放电产生方波,再经积分器转成三角波,再经微分器转成方波-Capacitor charging and discharging generate a square wave, and then by the integrator into a triangular wave, and then turn a square wave differentiator

开发板4412_ARM9开发，通过framebuffer控制电容屏，设置部分驱动方法：* 需要先关闭内核中的framebuffer驱动，否则会冲突 make menuconfig -> Device Drivers -> Graphics support -> Samsung S3C framebuffer support 同时要确保CONFIG_FB_S3C_NR_BUFFERS生成 程序里面有详细注释，中文注释-Development board 4412_