基于AT89S52和LCD1602的简单数字频率计，测量范围在0.2Hz到500kHZ之间，精度随频率有所变化。压缩包内包含Keil环境下的C语言源代码，以及Proteus仿真文件-Based on AT89S52 and LCD1602 a simple digital frequency meter to measure the range of 0.2Hz to 500kHZ between the precision with frequency change. Compressed p

10-b 50-MHz digital-to-analog (D/A) converter is presented which is based on a dual-ladder resistor string. This approach allows the linearity requirements to be met without the need for selection or trimming. The D/A decoding scheme reduces th