Category Archives: Op Amp

Low Battery Indicator


It is an ideal solution to protect rechargeable batteries from deep discharge. It gives an LED indication when the voltage level in the battery drops below5.1 volt

Posted in Chargers, Hobby Circuits, Home projects, Indicators, Op Amp, Power supply | Tagged , | Leave a comment

Moisture Sensor


This circuit indicates the level of moisture in a place due to rain or spilling of water. Green LED lights when there is moisture and Red LED lights when there is no moisture.

Posted in Detectors, Hobby Circuits, Indicators, LED, Op Amp, School Projects, Sensors | Tagged , , | 2 Comments

RAIN ALARM


This is a simple circuit that can be used to detect rain. It will give a loud beep when the first drop of rail falls on the sensor. So it useful to detect rain where sun drying is carried out.

Posted in Alarms, Detectors, Hobby Circuits, Home projects, Monitors, Op Amp, School Projects | Tagged , , | 3 Comments

SHADOW ALARM


This is the circuit of a simple burglar alarm that produces a loud beep when somebody crosses a protected area or door. The circuit is highly sensitive and can detect the shadow of the moving person from a distance of … Continue reading

Posted in Alarms, Detectors, Hobby Circuits, Home projects, Monitors, Op Amp, School Projects | Tagged , , , , | Leave a comment

Photodiode Light Sensor


Here is a Light Sensor using Photodiode.Photodiode is a type of light detector capable of converting light energy into either current or voltage, depending upon the mode of operation. Photodiodes are similar to typical semiconductor diodes except that they may … Continue reading

Posted in Alarms, Circuits, Detectors, Hobby Circuits, Light, Op Amp, Uncategorized | Tagged , , , | Leave a comment

SHADOW ALARM


This is the circuit of a simple burglar alarm that produces a loud beep when somebody crosses a protected area or door. The circuit is highly sensitive and can detect the shadow of the moving person from a distance of … Continue reading

Posted in Circuits, Hobby Circuits, Op Amp | Tagged , , , | 4 Comments

Giga Hertz Signal Detector


This circuit is useful to detect Microwaves sources like microwave oven satellite communication devices, Mobile phones etc. It gives audio visual indications when it detects the Microwaves in the Gigahertz band. Circuit in Word Format GigaHertz Signal Detector

Posted in Detectors, Higher level Projects, Hobby Circuits, Mobile phone, Op Amp, RF circuits | Tagged , , , | 2 Comments