As shown in Figure is a circuit diagram of an enhanced lock the AE1169. AE1168 enhanced when the lock button is pressed, AE1168 through the keyboard scan to determine the corre
sponding button, and in accordance with S1, S2, S3 state, the internal logic analysis treated, and the alarm relay K1, * K2 corresponding relay control. Circuit 12-bit quasi-keyboard, which represents the * key to confirm; key is the clear key, if they enter the wrong password, as long as the failure to confirm the * key, you can press this key to clear the input error. By switching S1, S2, S3 can easily achieve more than the collective *, multiplayer and single * alone * function.