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Archive for the ‘Detector’ Category


 Non contact ac detector voltage tester using CD4060

Sunday, April 6th, 2014

Tools that features equivalent of a professional, easy to use, cheaper, and more importantly, safe for use. For checking to find AC 220 Volt or 120V or call that AC main power in various points have or not? Most use a screwdriver to check the electricity. It is a lightweight, easy to carry. But the […]


 The telephone line status indicator

Tuesday, January 14th, 2014

This is a telephone line status indicator to prevent the hearing others talk on the phone accidentally and a Protection to making phone calls simultaneously. The telephone is a communication device that enables to communicate to each other, although it is far or near. Formerly, one phone number. Be used with only one phone. But […]


 Simple level voltage detector using LM741

Tuesday, December 17th, 2013

This is really Simple level voltage detector circuit. I like it so much because cause me know principle about comparator circuit form. As show in Figure below, We use LM741 OP-AMP(IC-741) highly popular is base of circuit. As video below. When we set all components to breadboard successfully. Suppose, we need to detects voltage 2-volts. […]


 Fuse failure alarm by 2 LED

Monday, August 19th, 2013

The Fuse failue alarm that LED display when the load is low resistors the circuit, fuse blow once. LED1,LED2 show fuse state. Im circuit use a few parts. How it works This circuit will show the performance of the equipment,or Check the fuse in the circuit.The circuit is small and the power supply voltage of […]


 Simple soil moisture alarm

Sunday, August 11th, 2013

The tree is very necessary for humans. Because can clean waste air, as a food, housing, medicine, etc., We should tree planting as well. Water is necessary for the trees. But the trees should be watered properly. If too much water rotten the trees, but less water to the trees wither, may be dead. As […]


 Smoke detector circuit

Wednesday, May 22nd, 2013

A smoke detector is part of a sophisticated alarm system. Which within the system is a professional, most will include Section detector gas, room filling ions. Or sensitive to radio signals. However, this circuit does not have to be so complicated. Just another 2 LDRs and LED detection. Only the number of IC LM1801, the […]


 Cheap alcohol tester circuit

Thursday, February 14th, 2013

My friends who live in California, USA, said that he likes to party with friends. With alcoholic beverages. And the need to drive a car. He does not want illegal traffic and to ensure the safety of everyone, so thought to buy this alcohol tester to the car. I agree. But he wondered how, Can […]


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