Keyless Lock


Posted on Mar 13, 2013

The circuit uses a four-bit latch (Ul). What makes the circuit sequential is that the set input of the first bit latch is tied


Keyless Lock
Click here to download the full size of the above Circuit.

to the reset of the second bit latch, and so forth. That ensures that any bit latched will be reset by the previous bit latch. The ECG8314 also has a master reset (pin 9) that is tied to the first bit-latch reset (pin 3), which provides an added measure of security for the lock. The outputs of Ul are fed to a four-input AND gate (U2), then to Ql (used as switching transistor), which is used to drive relay Kl. The EGC8314 has an enable low (pin) that can be used as a timing circuit, if that is desired.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

PIC controlled DDS VFO
Video Switcher with PIC16F819
Low-power-magnetic-current-sensor
Make Your Own USB Device using PIC18F4550
Advanced appliance timer
UV/IR/Visible LED Flashlight with Intensity Control
Temperature Sensor
Simple Door Alarm Circuit



Top