Mutchus

Here I am presenting you a simple smoke sensing alarm circuit using 555 timer . By using this circuit you can detect smoke and it alarms when the air is contaminated. Let me introduce you the components used in it. IC- NE555 Time r Sensor- PHOTO INTERRUPTER MODULE SPEAKER This smoke detecting alarm is based directly on an astable multivibrator and sensor (Photo interrupter module). The sensing module triggers the oscillator and generates an alarm through the loud speaker. Read More.....

ASTABLE MULTIVIBRATOR USING OP AMP Astable multivibrator is capable of producing square wave for a given frequency, Amplitude and Duty cycle. The output of OP AMP is forced to swing between positive saturation, +Vsat and negative saturation, -Vsat repeatedly. Which will results in Square wave output. This circuit is also called as Free Running Oscillator. Because, it doesn't requires any trigger pulse to get active. The output of an operational amplifier will be in positive saturation Vsat, if the differential input voltage is negative and vice versa. The differential voltage, Vd=Vc-βVsat. Where β is the feedback factor and βVsat is the potential at non-inverting terminal of the op amp. Consider the instant at which Vc=+Vsat. Now the capacitor charges exponentially towards +Vsat through R. Automatically, Vd increases and crosses zero. This happens when Vc=+βVsat. At the moment Vd becomes positive due to further charging of the capacitor. Output changes to -Vsat. Now capacitor sta...

Here is a Tv remote jammer circuit, using NE555 timer IC. By using this you can watch your favorite TV channel without any interruptions. Ie; No one can be able to change the channel by means of remote, if the circuit remains ON. The circuit is simple to make at your own home, with very low cost.  Let’s go deeply into the specification and requirements of this Project. Read More.....