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

Dynamic to electret microphone circuit
XR2212 PLL FM demodulator Circuit
100 transistor circuits
1W BTL Audio Amplifier



Top