Detector Circuits - Electronics Area https://electronicsarea.com Electrical and Electronics Tutorials and Circuits Tue, 26 Nov 2024 16:55:24 +0000 en-US hourly 1 https://wordpress.org/?v=4.9.26 Light detector circuit using LDR (automatic night light) https://electronicsarea.com/light-detector-circuit-ldr/ https://electronicsarea.com/light-detector-circuit-ldr/#respond Fri, 28 Jun 2024 17:41:38 +0000 http://electronicsarea.com/?p=1912 This circuit activates a lighting device through a relay when the intensity of daylight is no longer sufficient. Good for illuminating the main entrance of the house, a display case that needs to be kept lit at night, an unsafe area at night, etc.

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The post Light detector circuit using LDR (automatic night light) appeared first on Electronics Area.

]]> https://electronicsarea.com/light-detector-circuit-ldr/feed/ 0 Blown Fuse Indicator Circuit using one transistor https://electronicsarea.com/blown-fuse-indicator-circuit-using-one-transistor/ https://electronicsarea.com/blown-fuse-indicator-circuit-using-one-transistor/#respond Thu, 27 Jun 2024 09:13:58 +0000 http://electronicsarea.com/?p=1495 This single transistor blown fuse indicator circuit warns us by lighting a LED when there is a problem in an electrical installation protected by the fuse.

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The post Blown Fuse Indicator Circuit using one transistor appeared first on Electronics Area.

]]> https://electronicsarea.com/blown-fuse-indicator-circuit-using-one-transistor/feed/ 0 How to make a Light Sensitive Sound Generator Circuit? https://electronicsarea.com/light-sensitive-sound-generator/ https://electronicsarea.com/light-sensitive-sound-generator/#respond Mon, 27 Mar 2023 13:18:49 +0000 http://electronicsarea.com/?p=3297 Light Sensitive Sound Generator Circuit - An oscillator circuit may have many applications. The diagram shows how to make it work as a light sensitive sound generator using a LDR and a 741 operational amplifier.

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The post How to make a Light Sensitive Sound Generator Circuit? appeared first on Electronics Area.

]]> https://electronicsarea.com/light-sensitive-sound-generator/feed/ 0 Light activated switch circuit with LDR and Op Amp https://electronicsarea.com/light-activated-switch-circuit-ldr-opamp/ https://electronicsarea.com/light-activated-switch-circuit-ldr-opamp/#respond Fri, 24 Mar 2023 17:10:03 +0000 http://electronicsarea.com/?p=1447 This circuit has many applications. It could act as a photocell and switch off a light in a room or turn on the radio when it is dawning, etc.

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The post Light activated switch circuit with LDR and Op Amp appeared first on Electronics Area.

]]> https://electronicsarea.com/light-activated-switch-circuit-ldr-opamp/feed/ 0 2 LED Temperature Change Indicator with LM35 & 741 https://electronicsarea.com/2-led-temperature-change-indicator-lm35-741/ https://electronicsarea.com/2-led-temperature-change-indicator-lm35-741/#respond Tue, 03 May 2022 00:30:09 +0000 http://electronicsarea.com/?p=3566 This circuit shows us, by means of two LEDs, when the sensed temperature is above or below a set limit. When the temperature is above the pre-set temperature level, LED D1 will light up and if it is below, LED D2 will light up.

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The post 2 LED Temperature Change Indicator with LM35 & 741 appeared first on Electronics Area.

]]> https://electronicsarea.com/2-led-temperature-change-indicator-lm35-741/feed/ 0 Rain Detector using two Transistors https://electronicsarea.com/rain-detector-using-two-transistors/ https://electronicsarea.com/rain-detector-using-two-transistors/#respond Fri, 05 Feb 2021 17:55:27 +0000 https://electronicsarea.com/?p=3769 Circuit that aims to alert the beginning of the rainfall. Its few components make it an interesting and easy project.

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The post Rain Detector using two Transistors appeared first on Electronics Area.

]]> https://electronicsarea.com/rain-detector-using-two-transistors/feed/ 0 Dark detector circuit using LDR and relay https://electronicsarea.com/dark-detector-circuit-using-ldr-and-relay/ https://electronicsarea.com/dark-detector-circuit-using-ldr-and-relay/#respond Fri, 22 Jan 2021 19:28:06 +0000 http://electronicsarea.com/?p=1386 This circuit uses, as a main component, an LDR (photoresistor). An LDR changes its resistance value depending on the amount of light it received. The more light means less resistance, the less light means more resistance.

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The post Dark detector circuit using LDR and relay appeared first on Electronics Area.

]]> https://electronicsarea.com/dark-detector-circuit-using-ldr-and-relay/feed/ 0 Darkness detector circuit with audio output using 555 https://electronicsarea.com/darkness-detector-circuit-with-audio-output-using-555/ https://electronicsarea.com/darkness-detector-circuit-with-audio-output-using-555/#respond Fri, 06 Nov 2020 17:45:08 +0000 http://electronicsarea.com/?p=1429 The main elements of this circuit are the 555 integrated circuit, working as an astable multivibrator and an LDR which is used as darkness sensor.

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The post Darkness detector circuit with audio output using 555 appeared first on Electronics Area.

]]> https://electronicsarea.com/darkness-detector-circuit-with-audio-output-using-555/feed/ 0 Light Operated Relay Circuit using LDR / Photoresistor https://electronicsarea.com/light-operated-relay-circuit-using-ldr/ https://electronicsarea.com/light-operated-relay-circuit-using-ldr/#respond Mon, 12 Oct 2020 20:01:42 +0000 https://electronicsarea.com/?p=4601 The LDR varies its value (ohms) depending on the amount of light that illuminates it. The more light less resistance and less light more resistance, A potentiometer is used to control the light level that activate the relay

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The post Light Operated Relay Circuit using LDR / Photoresistor appeared first on Electronics Area.

]]> https://electronicsarea.com/light-operated-relay-circuit-using-ldr/feed/ 0 Photodiode Amplifier Circuit – Current-to-Voltage Converter https://electronicsarea.com/photodiode-amplifier-circuit/ https://electronicsarea.com/photodiode-amplifier-circuit/#respond Fri, 04 Sep 2020 16:41:17 +0000 https://electronicsarea.com/?p=6147 Very simple circuit that amplifies the current signal generated by a photodiode and transforms it into voltage with a controlled gain

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The post Photodiode Amplifier Circuit – Current-to-Voltage Converter appeared first on Electronics Area.

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