This circuit safely replaces common locks, since, instead of the key, the opening is made with the help of a card made with a printed circuit board. The locking element is the core of a solenoid that must be fitted to the gate tongue when the circuit is switched off. The lock plate must be installed so that its ends are on opposite sides of the gate so that it can be opened from the inside and outside. Note that the card and card tracks must follow the model shown, so that the key card can turn on the circuit power when contacting the lock plates.
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