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Mains Frequency Monitor(LM311)

2015-01-21 14:28  
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This article describes the Mains Frequency Monitor (LM311). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: LM311.

Here is a simple frequency counter designed to monitor the 240VAC mains supply. It as a frequency range of 0-999Hz, so it could also be used with 400Hz equipment. StandardTTL/CMOS logic is employed for the counters and display drivers, while an ELM446 (IC1) generates accurate 1Hz pulses for gating. This device utilizes a 3.579545MHz crystal for its timebase, as commonly found in TV and video circuits and even on old PC motherboards.

Figure:1 Mains Frequency Monitor Circuit Diagram

Figure 1 Mains Frequency Monitor Circuit Diagram




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