The transformer can, for example, be a power transformer, an audio frequency signal coupling transformer, or part of a filter circuit where it may be that frequency variations or other causes can reduce the load presented by the output to the input to {HEAD ~ a value} which adversely affects {TAIL ~ safety} 
adversely affects
The transformer can , for example , be a power transformer , an audio frequency signal coupling transformer , or part of a filter circuit where it may be that frequency variations or other causes can reduce the load presented by the output to the input to { HEAD ~ a value } which adversely affects { TAIL ~ safety }
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