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BUY LM331N https://www.utsource.net/itm/p/11243013.html
IC CONV PREC VOLT TO FREQ 8-DIP
Description: The LM331N is a precision voltage-to-frequency converter from National Semiconductor. Features: Wide Operating Voltage Range: 3V to 30V Low Power Consumption: 0.3mA High Accuracy: 0.1% Low Temperature Coefficient: 0.1%/°C Low Output Impedance: 0.1Ω Low Output Noise: 0.1mV Wide Frequency Range: 0.1Hz to 1MHz Applications: Voltage-to-frequency conversion Frequency-to-voltage conversion Frequency measurement Frequency control Pulse width modulation Pulse position modulation Frequency divider Frequency synthesizer (For reference only)