本机为读书或工作时播放背景音乐而制作。该用途不必使用电力消耗较大的大功率放大器。小型的小功率放大器即可胜任,功率输出管选用三极管较为合适。本次制作采用电视机垂直偏转管6S4A 作为功率输出管。在一般使用情况下,该管输出功率不超过2W,作为背景音乐,播放机可适当提高其功率输出。另外出于用途上的考虑,外形设计得十分小巧。本机电路原理如附图所示。 This machine is made for reading or working background music. This use does not have to use a large power amplifier with a large power consumption. Small small-power amplifier can be competent, the power output transistor selection transistor more appropriate. This production uses the TV vertical deflection tube 6S4A as the power output tube. In normal use, the tube output power does not exceed 2W, as the background music, the player may be appropriate to increase its power output. In addition for consideration on the use of the shape design is very compact. The circuit principle as shown in the attached figure.