Development of OPTO-LDR coupled timer based voltage to frequency converter  

基于光敏耦合定时器的压频转换器的实现（英文）

作　　者：Akash Kumar Anindya Debnath Antar Banik Kabirul Islam Mondal Partha Pratim Biswas Rik Bhattacharyya T K Maiti 

机构地区：[1]德里理工学院应用电子与仪器工程系,印度加尔各答700152

出　　处：《Journal of Measurement Science and Instrumentation》2017年第1期17-20,共4页测试科学与仪器（英文版）

摘　　要：This paper describes the development of a timer based voltage to frequency converter(V FC).Timer LM555is used in astable multivibrator mode with two OPTO-LDRs(light dependent resistors)in the circuitry.The frequency of timer output waveform which is measured using a digital storage oscillator(DSO)is almost linearly proportional to the applied input voltage.Hence we obtain a linear relationship between the frequency of timer output waveform and the input voltage.Because of its quasi-digital output,the main advantages of this developed converter are linear input-output relationship,small size,easy portabilityand high cost performance.In addition,the timer output waveform can be directly interfaced with personal computer or microprocessor/microcontroller for further processing of the input voltage signal without intervening any analog-to-digital converter(ADC).

关 键 词：timer LM 555 astable multivibrator light emitting diode (LED) light dependent resistor (LDR) voltage to frequency converter (V FC) digital storage oscillator (DSO) 

分 类 号：TM46[电气工程—电器]