Column: Optical isolation


Figure 4: Module 2 prototype circuit board


to provide a 10.00V reference voltage from a +12V power supply. Tis 10.00V reference is then divided by resistors R7 and R8 to obtain +5.00V, which is connected to the non-inverting input of the buffer amplifier LM358P-2B, with an output fixed at +5.00V and capable of sourcing up to 20mA.


Unlike Module 1, in this design


the circuit’s output is powered by only +12V and −12V that are isolated from the +12V applied to the circuit’s input. For proper operation, make sure that R7 = R8. To calibrate the circuit when S1 is


open, set VIN P1 make VOUT


closed: 1. Set VIN


make VTP1 when VIN


to +5.00V and by adjusting = +5.00V. When S1 is


to +5.00V and by adjusting P1 = +5.00V.


2. By adjusting P2, make sure that when VIN


= 0.00V, VOUT = +5.00V, VOUT


= −5.00V and, also, = +5.00V.


FANS AND BLOWERS FOR PRESSURISED AIR AND SUCTION


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