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Diagram
4. With your scope Gnd referenced to point D or A, switch on the DC supply. Wait a second and then switch the opto. The
current should go up to about 110 mA. If it goes rather high you have a fault.
5. Using the oscilloscope, check pins 11 and 14 of the SG3525. This should give a square wave output similar to that shown
below:
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