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:: Home » Meters & Detectors

Meters & Detectors

Include: Volt meters :: Sound level meter :: Analog vu meter :: Soil moisture meter :: Digital meter circuit diagram :: Temperature measurements :: Electronic measurement tools :: Frequency meters :: Best battery tester :: Transistor tester project
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Motion detector alarm circuit with a PIR sensor

Last Updated on: June 22, 2023 by Apichet Garaipoom
Motion detector alarm circuit with PIR sensor

You have a private area, right? If you have this motion detector alarm circuit. It will reduce your worries. Imagine a big bear is coming to the behind of your house. Then, the siren alert. The big bear is shocked and runs away. You and your family are safe. Is it great? Read more

Categories Controls & Timers, Meters & Detectors Tags Motion sensor, Cheap burglar alarms 30 Comments

Ghost Detector Static Charge Monitor by Lennie

Published on: May 16, 2023 by Apichet Garaipoom

This is a Ghost Detector circuit or Static Charge Monitor circuit by Lennie. The Label was printed on card stock; clear coated with light coats of spray enamel; cut, and attached down a tomato paste can. This article was copied from Lennie Zink’s article.    

Categories Meters & Detectors, Lennie Tags Fun circuits, Lennie Zink Leave a comment

Low Voltage Battery Indicator circuit using LM339

Last Updated on: July 12, 2023 by Apichet Garaipoom
Low Voltage Battery indicator circuit

The simple low voltage tester circuit using LM339,can use Battery voltage monitor for voltage sources that problems, by LED display and alarm sound. Read more

Categories Meters & Detectors, Recycling electronics Tags Battery Testers, Electronic buzzer, Level voltage indicator 12 Comments

Continuity tester circuit with Buzzer and LED

Last Updated on: July 8, 2023 by Apichet Garaipoom
Create continuity tester circuit with buzzer and LED

Create continuity tester circuit with buzzer and LED for check solder joint defects, not kill components on PCB, as probe gives tiny current and voltage. Read more

Categories Meters & Detectors Tags Electronic buzzer, IC-741, Tested 4 Comments

LED VU Meter circuits using transistors, 5 to 20, 40 LED

Last Updated on: March 23, 2023 by Apichet Garaipoom
LED VU meter transistor

See LED VU meter using transistor is analog circuit to show the level of power audio signal. You can build 5 LED to 20 LED display with PCB. Read more

Categories Meters & Detectors Tags Sound Level Meters, NPN transistor circuit, VU Meters 13 Comments
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Categories

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