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Đây là sơ đồ của một trigger kiểu RS (set/reset) hay Bistable Multivibrator lắp bằng transistor. Bạn thêm một cái transistor để làm tầng ra điều khiển relay. Bạn muốn nó đóng ưu tiên về bên nào thì giảm bớt điện trở phân cực của bên đó. Nếu chưa đạt độ nhạy như ý thì tăng 2 tụ nạp lên.
Xung kích đầu vào lấy từ một điện trở nối lên nguồn dương, khi nào bạn ấn công tắc nối nguồn âm thì bạn có một xung âm như ý rồi.
Bạn thử xem sao nhé.
Tôi trích luôn đoạn thuyết minh về mạch điện này:
Sequential Switching Bistable Multivibrator
Switching between the two states is achieved by applying a single trigger pulse which inturn will cause the "ON" transistor to turn "OFF" and the "OFF" transistor to turn "ON" on the negative half of the trigger pulse. The circuit will switch sequentially by applying a pulse to each base in turn and this is achieved from a single input trigger pulse using a biased diodes as a steering circuit. Equally, we could remove the diodes, capacitors and feedback resistors and apply individual negative trigger pulses directly to the transistor bases.
Bistable Multivibrators have many applications producing a set-reset, SR flip-flop circuit for use in counting circuits, or as a one-bit memory storage device in a computer. Other applications of bistable flip-flops include frequency dividers because the output pulses have a frequency that are exactly one half (f/2) that of the trigger input pulse frequency due to them changing state from a single input pulse. In other words the circuit produces Frequency Division as it now divides the input frequency by a factor of two (an octave).
Switching between the two states is achieved by applying a single trigger pulse which inturn will cause the "ON" transistor to turn "OFF" and the "OFF" transistor to turn "ON" on the negative half of the trigger pulse. The circuit will switch sequentially by applying a pulse to each base in turn and this is achieved from a single input trigger pulse using a biased diodes as a steering circuit. Equally, we could remove the diodes, capacitors and feedback resistors and apply individual negative trigger pulses directly to the transistor bases.
Bistable Multivibrators have many applications producing a set-reset, SR flip-flop circuit for use in counting circuits, or as a one-bit memory storage device in a computer. Other applications of bistable flip-flops include frequency dividers because the output pulses have a frequency that are exactly one half (f/2) that of the trigger input pulse frequency due to them changing state from a single input pulse. In other words the circuit produces Frequency Division as it now divides the input frequency by a factor of two (an octave).
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