Digital Entry Lock


Posted on Nov 8, 2012

A keypad enters a four-digit access code, which is programmed via jumpers on a 24-pin plug-in header and socket. Ul is a


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

n LST220, which detects a four-digit sequential data input. When the correct data is entered into the keyboard, pin 13 of Ul goes high, which activates Ql and Kl. K1 drives an external electric lock solenoid, etc.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Fridge Alarm with 4060
RF Recieving Amplifier for 40MHZ
How to Make a Simple Reverse Forward LED Light Chaser Circuit Using IC 4017
The Cylonduino Arduino Experiement
Add Ramp To Stepping Motor
making an rf car
ICL7106 electronic thermometer circuit design project
Electronic Doorbell Circuit
Driving a fluorescent tube
Electronic Dictionary Radar Terms
Q-multiplier filter circuit
MC81 holiday lights ASIC
Professional Mobile (1G 2G 3G 4G) & WiFi Jammer Circuit



Top