1、LM339DR 放大器里面有一个基准电压,如果超过这个基准电压的话是低电平还是高电平?
2、我想通过LM339DR 放大器这个器件,讲我15V的电压,降到3.3V,以下我的电路正确吗,是怎么样的原理。我取的中点电压为7.5
3、请帮忙看一下未使用的引脚是不是这样连接的

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