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This ball speed checker circuit measures the speed of a cricket ball based on the time taken by the ball to travel the distance from the bowling crease to the batting crease. Ball speed checker circuit As shown in Fig. 1,...
Here is a circuit that stimulates nerves of that part of your body where electrodes are attached. It is useful to relieve headache and muscular pain and revive frozen muscles that impair movement. Though it provides muscles stimulation and...
Normally, hearing aid circuits consume battery power continuously once they are switched on. The smart hearing aid circuit given here saves battery power by switching on the sound amplifier section only when sound is detected. The sensitivity of the...
Two automated alarm circuits are presented here. One produces bird-chirping sound and the other British police siren tone. Fig.1 shows the circuit of the bird-chirping-sound alarm unit along with the circuit of the control unit. Fig.2 shows the circuit...
The idea behind this multipurpose power pulser is very simple. As shown in the circuit (Fig. 1), it uses a low-frequency oscillator to drive a voltage regulator. Multipurpose power pulser circuit Timer chip LM555 (IC1) is wired as an astable multivibrator....
This anti-theft device for bicycles is inexpensive and can be constructed easily using a few components. At the heart of the circuit is a wheel rotation detector, realized using a DC micro motor. For the purpose, you can use the...
With this simple clock controlled timer, you will never again miss your favourite TV or radio programme. The TV or radio will switch on automatically at the time preset by you and will remain ‘on’ until the power supply...
This circuit works as a mobile anti-theft system. It produces a loud chirping sound whenever someone tries to take away the mobile and also works as a mobile charger.
This geyser timer circuit sounds an alarm after the set timing of 22 minutes when the water is heated up. Geyser timer circuit The circuit comprises a timer IC 555 wired as an astable multivibrator with adjustable time period of 15...
A dog whistle is a type of whistle that emits sound in the ultrasonic range, which people cannot hear but some other animals can, including dogs and domestic cats, and is used in their training. We, humans can hear...