In many electronics projects we required a 5V DC supply. This DC supply acts as a battery for the circuit. Now we can buy a DC supply from...
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Showing posts with label Analog. Show all posts
Showing posts with label Analog. Show all posts
Antenna Preamplifier for AM Radios
AM radios are still used for capturing transmissions from long distances (DX reception). But AM radios normally require long (10-30m) outd...
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Quiz Buzzer for Quiz Competitions in School and Collages
Manual buzzers used for quiz competitions in schools and colleges create a lot of confusion in identifying the first respondent. Although...
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Temperature controlled Fan
This circuit is a simple circuit where the speed of the fan is controlled by temperature. You require a pot of 1 kilo ohm and a the...
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USB powered LED Lamp circuit
Here is a simple USB powered lamp that can be used to light your desktop during power failures. The circuit operates from the 5 Volt availa...
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Air flow detector circuit
This circuit can give a visual indication of the rate of air flow.It can be also used to check whether there is air flow in a given space. ...
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Seismic / Vibration Sensor
This is the circuit diagram of seismic / vibration sensor. The circuit simulates a seismic sensor to detect vibrations/sounds. It’s really ...
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Shutter Guard Circuit
This is the shutter guard circuit which has sensitive vibration sensor, piezo-sensor. This circuit is specifically designed for outlets to ...
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INTELLIGENT AUTOMATIC PLANT IRRIGATION SYSTEM
Irrigation is the key to a successful garden. Long gone are the days of manual watering or relying on a friend to water when you are on voc...
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Audio-Visual Extra Ringer for Phone
Many a times one needs an extra telephone ringer in an adjoining room to know if there is an incoming call. For example, if the telephone...
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USB Powered Stereo Computer Speaker
This is the circuit diagram of USB powered computer speaker, or it widely known as multimedia speakers for PCs. The circuit has single-chip...
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Electromagnetic field sensor
This is a very simple circuit that can be used to sense electromagnetic radiations. The circuit can even detect hidden wrings. A 1mH induct...
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Water Sensing Indicator
This is a simple circuit for sensing the water. It consists one DC battery, a resistor and a speaker. There are two contacts A and B which ...
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Voice Recorder and Playback Circuit
With this circuit, you can record your voice and play back the same for 20 seconds. The voice recorder circuit is ideal for door phones, au...
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Motorbike Alarm
This simple-to-build alarm can be fitted in bikes to protect them from being stolen. The tiny circuit can be hidden anywhere, without any c...
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Solar Charger for 6V 4.5Ah Battery
Here is a solar charger circuit that is used to charge Lead Acid or Ni-Cd batteries using the solar energy power. The circuit harvests sola...
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Cable Tester
Have you ever wondered if a particular cable is delivering mains power supply to your device or not? Here is a solution that helps you test...
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Audio Amplifier Circuit
The heart of the amplifier is the transistor. We could have used a more ordinary NPN transistor, such as the 2N4401, but to get a louder so...
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Speed control of DC motor
In this circuit we used a variable resistor of 1k ohm ( pot ) and a 5V DC motor. As we know the DC motor speed is generally depends on the...
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