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191问答库 > 三极管基极接一下拉电阻，串接的电阻可以不要吗？图片看链接，问题来源链接：

三极管基极接一下拉电阻，串接的电阻可以不要吗？图片看链接，问题来源链接：

2025-03-15 12:15:26

推荐回答（1个）

回答1：

有三种情况:
1、如果heat输出的是模拟信号(如正弦逆变信号),那么QT1便是模拟放大器,R7就相当于上偏置电阻,去掉R7后QT1就会进入饱和状态,使正弦信号失真;
2、如果heat输出的是脉冲信号,幅度在3V以下时时,可以去掉R7;
3、如果heat输出的是脉冲信号,幅度在大于3V时,去掉R7后会使QT1的Ieb电流过大毁坏b极。
因为找不到2690a的参数,只能说这些。

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