Column: Optical isolation


Series: LM358P


Number of channels: Two


Package/case: PDIP-8


Technology: Bipolar


Supply type: Single, dual


Single supply voltage: Min: 3V, Max: 32V


CMRR – common mode rejection ratio:


65dB to 80dB


Input voltage noise density: 40nV/sqrt Hz


GBP – gain bandwidth product: 700kHz


Output current per channel: 30mA


Operating supply current: 350uA


Vos – input offset voltage: 7mV


Shutdown: No shutdown


Input type: Rail-to-rail


As seen from Tables 1 and 2,


some modules require +5.00V and/ or +6.26V power supplies. In this project to obtain these voltages from a +12V or +24V power supply, low- cost, adjustable LM2596 step-down voltage regulator modules are used. Figure 4a shows the diagram of the


voltage regulator module consisting of three adjustable LM2596 step- down voltage regulators, whereas Figure 4b shows the voltage regulator module. By using this voltage regulator


module, three independent voltage values can be adjusted and used. D1 is used to make sure that the polarity of the DC input voltage is correct. Switches S1, S2 and S3 (implemented by using jumpers) are used to turn on or off the adjustable LM2596 voltage regulators 1, 2 and 3, respectively.


(b) (a) Figure 3: Top view of the HCNR201 DIP package


Figure 4: (a) Diagram of the voltage regulator module consisting of three adjustable LM2596 step- down voltage regulators; (b) The voltage regulator module


18 December 2021/January 2022 www.electronicsworld.co.uk


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