Wiring circuit

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. Standard TTL/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 diagram and even on old PC motherboards.

Mains Frequency Monitor Circuit Diagram

Source by : Streampowers

Build a Voltage-To-Frequency Converter Circuit Diagram 2. Using a Burr-Brown VFC 32 IC, this voltage-to-frequency converter uses few components. The schema values are shown in the figure. This charge-balanced V/F converter uses a VFC32 or a VFC320 IC. 

The positive charge from the 1-mA balances the negative charge from the input. V/F converter waveforms are shown in Fig. 100-l(b).