Simple lock circuit can alarm

Posted on Nov 10, 2015

Circuit works: Figure 5 -2a in S. Alarm switch. If you press S, after the relay K. Electrical work, two normally open contacts Pull,

Simple lock circuit can alarm
Click here to download the full size of the above Circuit.

so that the alarm bells sound. At this time, even when you release s. Alarm sound is still large, and so only after the arrival of the owner off the power to stop the alarm. so, S. , S6 valid switch. After pressing so, K2 relay energized electrical appliances, two normally open contacts K2A, Kze pull; and finally press S6, K4 relay is to energize, K. A, K4B normally open contact sticking, thereby turning on the power smoothly electronic lock to open the lock. Note that so, s8, S6 open order can not be reversed, otherwise invalid. S: a S ,, S7, S9 are normally closed push button switch, unlocking switch can not be pressed several, whether the circuit is broken, K2, K3, K4 relay re-energized. The schematic set unlock password is "086", of course, readers can also reset the password lock.

Leave Comment

characters left:

New Circuits



Popular Circuits

Car 12V to +-20V DC converter
Audio sine-wave generator
Voltage Multiplier
240Z Headlight Relay Mod
Hydro alarm circuit diagram using CMOS
Room Recorder