This is of advance simple electronic code lock circuit one can make. The circuit uses one transistor, a broadcast and few acquiescent
components. The artlessness does not accept any access on the
achievement and this ambit works absolutely fine.
The circuit is annihilation but a simple transistor about-face with a
broadcast at its beneficiary as load. 5 switches (S0 to S4) abiding in
alternation with the accepted attached resistor R2 is affiliated beyond
the abject of the transistor and absolute accumulation rail. Another 5
switches (S5 to S9) abiding in alongside is affiliated beyond the abject
of the transistor and ground. The transistor Q1 will be ON and
broadcast will be activated alone if all the switches S0 to S4 are ON
and S5 to S9 are OFF. Arrange these switches in a confused address on
the console and that it.
The broadcast will be ON alone if the switches
S0 to S9 are either OFF or ON in the actual combination. The accessory
to be controlled application the lock ambit can be affiliated through
the broadcast terminals. Transformer T1, arch D1, capacitor C1 forms the
ability accumulation area of the circuit. Diode D2 is a freewheeling
diode. Resistor R1 ensures that the transistor Q1 is OFF if there is no
affiliation amid its abject and absolute
