| 摘要 |
1. Safe system of logical product has its first and second input connected respectively to the first and second transistor base, while the second transistor has its emitter connected directly to the mass of assembly containing additionally a transformer with one end of the secondary winding connected to the mass and third transistor with its collector connected through the resistor to the positive lead of the power supply and the system output; is characterised in that one end of the primary transformer winding (TR) is connected between the collector of the first transistor (T1), whose emitter is connected to the positive lead of the power supply (+V1) and a cathode of the first diode (D1), whose anode is connected to the mass, while the second end of the primary transistor winding (TR) is connected between the collector of the second transistor (T2) and anode of the second diode (D2), whose cathode is connected with the positive terminal of power supply (+V1), whereas the second end of secondary transistor winding (TR) is connected via a resistor (R1) with the base of the third transistor (T3), whose emitter is connected directly to the mass of the assembly.<IMAGE>
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