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带有连续放音功能的双卡机,都有一个用于“连续”与“非连续”选择开关。本电路利用原机上的“消差拍”开关兼作此开关,以免在面板上加装开关。电路如右图所示。设先按下A卡放音键,开关K_1闭合,BG_1导通,A卡电机M_1转动。同时,A点电压低于0.3 V,通过D_1将B点电位钳在0.6 V以下,再按下B卡放音键时,开关K_2虽然闭合,但BG_2仍不能导通,B卡电机M_2暂停。A卡走带终止后;自停机构使放音键复位,K_1断开,BG_2基极电
Dual card machines with continuous playback have one for “continuous” and “discontinuous” selector switches. The circuit using the original machine “eliminate bad beat ” switch as both the switch, so as not to install the switch on the panel. Circuit shown on the right. Let the first press the A card playback key, switch K_1 closed, BG_1 conduction, A card motor M_1 rotation. At the same time, the voltage at point A is lower than 0.3 V, and the potential at point B is clamped below 0.6 V through D_1. When button B is pressed, the switch K_2 is closed, but BG_2 still can not be turned on, and the M card of motor B is suspended. A card after the tape is stopped; self-stop mechanism to release key reset, K_1 off, BG_2 base electricity