ELECTRONIC CODE LOCK Russian patent published in 2002 - IPC

FIELD: electronics. SUBSTANCE: the electronic code lock has a contact circuit, first, second and third counters, reference code unit, comparison circuit, first, second and third flip-flops, NOR gate, decoder, actuating mechanism, indicator, pulse generator, frequency divider, frequency selector switch, register and an OR EXCLUDING gate. The first and second inputs of the comparison circuit are connected respectively to the outputs of the register, and reference code unit, whose input is connected to the first input of the counter. The flip-flop setting input is connected to the output of the comparison circuit, and the output - to the strobing input of the decoder, whose output is connected to the input of the actuating mechanism. The counter count input is connected to the output of the contact circuit, setting input of the flip-flop, first input of the NOR gate, strobing input of the comparison circuit, clock input of the register and the first inputs of the frequency selector switch and the OR EXCLUDING gate. The second input of the NOR gate is connected to the direct output of the flip-flop and the inhibit input of the indicator, whose input is connected to the register output. The inverted output of the flip-flop is connected to the resetting inputs of the flip-flop, register and counter, whose second output is connected to the decoder input, the second input of the frequency selector switch is connected to the count input of the frequency divider and the generator output, whose resetting inputs are connected to the output of the NOR gate. The third input of the frequency selector is connected to the output of the frequency divider and the count input of the counter, whose first and second outputs are connected respectively to the flip- flop setting and reset inputs. The counter resetting input is connected to the output of the OR EXCLUDING gate, whose second input is connected to the flip-flop resetting input and the inverted output of the flip-flop. The output of the frequency selector switch is connected to the input of the counter, whose output is connected to the register information input. EFFECT: reduced probability of unauthorized revelation of code. 1 dwg _