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《家庭电子》2000年第11期《自制电脑用电视接收器》一文有较好的实用性,但在市电电压稍微偏低(例如190V)或高频头接收的信号不是来自公共有线电视而是接至普通简易天线时,效果不是很好。当市电电压低到190V时就经常跑台,经测量是+33V电压端电压不足31V,而且由于此时33V稳压集成电路μPC574J已不起稳压作用了,所以这个不足31V的电压也是很不稳定的,因此
“Home Electronics” No.11, 2000 The article entitled “TV Receivers for Homemade Computers” is more practical. However, signals received at a slightly lower mains voltage (for example, 190V) or tuner do not come from public cable Is connected to the ordinary simple antenna, the effect is not very good. When the mains voltage is low to 190V, it often runs the stage. The voltage of the + 33V voltage is less than 31V, and the voltage of less than 31V is very low because the 33V regulator IC no longer functions as a regulator. So unstable