The locker alarm circuit or cashbox watcher can be used to protect a cashbox/locker from unauthorised access. This tried and tested design forms a fool-proof,remotely operated alarm/electromagnetic ...
The circuit will provide a beeping sound to alarm the household that the refrigerator door has been opened for more than 20 seconds. 4060 – a 14-bit ripple counter with internal oscillator that has ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results