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Mains AC Voltage Monitor Circuit

Last Updated on April 7, 2020 by Admin 4 Comments

mains voltage monitor

You might want to find out instantly whether or not the mains voltage is running low before starting an important task because the load switch ON might cause an already […]

Filed Under: Indicators

Bicycle Light and Alarm Circuit

Last Updated on November 17, 2024 by Admin Leave a Comment

bicycle light

The post illustrates a simple bicycle light circuit which can be used as a normal front/back indicator lights, and also as an emergency alarm signal such as an SOS signal. […]

Filed Under: Indicators, Security and Alarm Circuit

Coffee Temperature Indicator Circuit

Last Updated on March 17, 2020 by Admin Leave a Comment

coffee temperature indicator circuit

In this post we will build a circuit that can be used for identifying and alerting the user regarding the right temperature of the coffee. The LED indicators will indicator […]

Filed Under: Indicators, Lights and Lamps

Office Bell with IN/OUT Indicator Circuit

Last Updated on November 27, 2018 by Admin Leave a Comment

This office bell with IN/OUT indicator circuit utilizes three 7-segment, common anode displays rather than a couple of LEDs for the in/out indicator as is done commonly. As soon as […]

Filed Under: Indicators

Battery Status Indicator Circuit using two Transistors only

Last Updated on November 25, 2018 by Admin Leave a Comment

Often a backyard electronic system could become imperfect as a result of a perishing battery. If the battery voltage is no more than 9V for a 12V operated system, the […]

Filed Under: Indicators

Temperature Meter Using Digital Multimeter

Last Updated on September 9, 2018 by Admin Leave a Comment

measure temperature with multimeter

Using this handy circuit, we are able to transform an ordinary transistor and a multimeter (in the VDC scale) perfectly into a digital temperature meter having a range of -30 […]

Filed Under: Indicators, Temperature Controller

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