The simplest Electronic Door Lock
#electronic door lock
#relay
#transistor
#BD135
#2N2222
#security
#buttons
#supply voltage
#switching
Description: To put the relay in tension the 4 buttons S1 S4 must be pressed. If anyone of the 4 buttons S5 S8 are pushed the relay doesn't tension (doesn't receive supply voltage). The supply voltage must be equal to the working voltage of the relay. One transistor like BD135 can commute up to 0.5A, in the same time 2N2222 can do only 0.2A.
The circuit operates based on a relay control mechanism that requires specific button presses to activate. The primary components include four buttons (S1, S2, S3, S4) that must be pressed simultaneously to energize the relay. This action allows the relay to receive the necessary supply voltage, which must match its rated working voltage for proper operation.
In this configuration, the relay's activation is contingent upon the closure of these buttons. If any of the secondary buttons (S5, S6, S7, S8) are pressed, it interrupts the supply voltage to the relay, preventing it from being energized. This feature serves as a safety mechanism, ensuring that the relay remains inactive unless all primary conditions are satisfied.
The circuit utilizes transistors for switching purposes. The BD135 transistor is capable of handling a collector current of up to 0.5A, making it suitable for applications that require higher current loads. In contrast, the 2N2222 transistor has a lower current rating of 0.2A, which may limit its use in more demanding applications. Proper selection of the transistor based on the load requirements is critical to ensure reliable operation.
In summary, this circuit design emphasizes the importance of simultaneous button activation for relay operation, the role of transistors in controlling current flow, and the necessity of matching supply voltage with relay specifications. The inclusion of safety buttons provides an additional layer of control, ensuring the relay operates only under desired conditions.To put the relay in tension the 4 buttons S1 S4 must be pressed. If anyone of the 4 butoons S5 S8 are pushed the relay donts tension ( dont receives supply voltage ). The supply voltage must be equal to the working voltage of the relay. One transistor like BD135 can commute up to 0.5A, in the same tine 2N2222 can do only 0.2A.
The circuit operates based on a relay control mechanism that requires specific button presses to activate. The primary components include four buttons (S1, S2, S3, S4) that must be pressed simultaneously to energize the relay. This action allows the relay to receive the necessary supply voltage, which must match its rated working voltage for proper operation.
In this configuration, the relay's activation is contingent upon the closure of these buttons. If any of the secondary buttons (S5, S6, S7, S8) are pressed, it interrupts the supply voltage to the relay, preventing it from being energized. This feature serves as a safety mechanism, ensuring that the relay remains inactive unless all primary conditions are satisfied.
The circuit utilizes transistors for switching purposes. The BD135 transistor is capable of handling a collector current of up to 0.5A, making it suitable for applications that require higher current loads. In contrast, the 2N2222 transistor has a lower current rating of 0.2A, which may limit its use in more demanding applications. Proper selection of the transistor based on the load requirements is critical to ensure reliable operation.
In summary, this circuit design emphasizes the importance of simultaneous button activation for relay operation, the role of transistors in controlling current flow, and the necessity of matching supply voltage with relay specifications. The inclusion of safety buttons provides an additional layer of control, ensuring the relay operates only under desired conditions.To put the relay in tension the 4 buttons S1 S4 must be pressed. If anyone of the 4 butoons S5 S8 are pushed the relay donts tension ( dont receives supply voltage ). The supply voltage must be equal to the working voltage of the relay. One transistor like BD135 can commute up to 0.5A, in the same tine 2N2222 can do only 0.2A.
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