Door Knob alarm
Here is circuit if you want an alarm to be sounded when somebody touches some thing. If any body touches say, the door handle, buzzer inside rings. But if want to keep the intruder away, keep the circuit on in the night or when you are away. It can be configured for use in a [...]
IC555 Interal diagram and description
IC 555 has been one of the most popular ICs since Signetics introduced it in the early 70s. 555 is also called as a TIMER IC. This 8-pin chip is a versatile device suitable for astable, mono-stable and bi-stable operations. It is such a multipurpose device that hobbyists find clever uses of it everyday. It [...]
