The breath detector circuit I have explained below can be used to check or monitor the breathing function of a human or patient. So I have explained the detailed working of the circuit from the following explanation: Component Functions LM324 Op amp: A few operational amplifiers (op-amps) in the circuit magnify the minute voltage changes […]
Sensors and Detectors
Footsteps Detector Circuit
By sensing vibrations from footfall, a Footsteps Detector Circuit is a creative and affordable approach for catching intruders. It employs a simple setup with a low-cost loudspeaker and a mute switch to pick up even the smallest steps. This simple circuit is excellent for enhancing building and garden security. We’ll go through the fundamental components […]
Atmospheric Pressure Indicator Circuit [LED Barometer Circuit]
With temperature, if there is one characteristic physical quantity of the past or future weather, it is certainly atmospheric pressure. The variations of this quantity are particularly interesting for weather forecasting: a decrease in pressure invariably heralds the arrival of rain, while a significant increase is a certain sign of improvement or persistent good weather. […]
Mobile Signal Vibrator Circuit
This mobile signal vibrator circuit will detect the wireless high frequency signals from your mobile phone and will activate the connected vibrator motor. This circuit can be used for many different customized applications. While the implementation of an external vibrator is not electronically complicated, it encounters a simple mechanical problem with the vibrator. How can […]
ON/OFF Relay Switch Circuit using Reflection Sensor
This 220 V ON/OFF electronic relay switch can be toggled ON/OFF simply by alternately bringing your finger close to the reflection sensor CNY70. About CNY70 CNY70 is an infrared reflecting sensor comprised of an infrared emitting diode and a phototransistor housed in a tiny plastic container. The sensor operates by generating infrared light and sensing […]
Simple Vibration Sensor Circuit
As its name suggests, this simple vibration sensor circuit using piezo transducer allows for the detection of vibrations to which its sensor is subjected. Unlike superficial pressure sensors whose resistance varies depending on the force they are subjected to, the transducer used here is only sensitive to variations in pressure exerted on its sensitive face. […]