光耦TPL521在电路中怎么接，有没有正负极？三极管三个极怎样辨别，急求，希望高手指点！！！ 怎样确定三极管的正负极
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给你提供个图供参考。
三极管三个极是不是固定的，
如果中间是基极则左边发射极右边集电极，
如果右边是基极则中间集电极，左边是发射极，
左边是基极则中间集电极，右边是发射极，
不管什么三极管发射极肯定不会是在中间。
金属封装的三极管一般上螺丝的集电极。
无法回答
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