Remote Operated Home Appliances...

Here is the circuit diagram of Remote Operated Home Appliances or Remote controlled Home appliances. Connect this circuit to any of your home appliances (lamp, fan, radio, etc) to make the appliance turn on/off from a TV, VCD, VCR, Air Conditioner or DVD remote control. The...

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How to build Mains Operated LED Circuit Schematic

Here is a simple and powerful LED circuit that can be operated directly from the AC 100 volt to AC 230 Volts mains supply. The circuit can be used as mains power locator or night lamp etc.. The resistor R1,R2 and capacitor C1 provides necessary current limiting. The circuit...

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Infrared Remote Tester

A very simple device allowing a quick check of common Infra-red Remote-Controls can be useful to the electronics amateur, frequently asked to repair or test these ubiquitous devices. A reliable circuit was designed with a handful of components: the LED will flash when any of...

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USB Powered Audio Power Amplifier

This circuit of multimedia speakers for PCs has single-chip-based design, low-voltage power supply, compatibility with USB power, easy heat-sinking, low cost, high flexibility and wide temperature tolerance. At the heart of the circuit is IC TDA2822M. This IC is, in fact, mono-lithic...

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Simple LDR Light Alarm

This is a light alarm circuit. This circuit uses Light dependent resistor (LDR). When there is no light fall on the LDR, the transistor driving the speaker is not turned on, because its resistance is high. When the LDR receives light, its resistance decreases and the collector...

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Ding Dong Door Bell Circuit Design using 8021-2 IC

The following schematic shows a Ding Dong Door Bell Circuit Design using 8021-2 IC. The 8021-2 IC is an 8-pin DIP having an in-built circuitry to produce dingdong sound each time its pin 3 is pulled low. The Ding Dong Door Bell Circuit Design consists of:...

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5 to 30 Minute Timer Circuit

A switched timer for intervals of 5 to 30 minutes incremented in 5 minute steps. Simple to build, simple to make, nothing too complicated here. However you must use the CMOS type 555 timer designated the 7555, a normal 555 timer will not work here due to the resistor values....

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Simple metal detector circuit diagram using CS209A

This simple metal detector circuit diagram is used to sense the presence of metal. A 100uH is used as a sensor. IC C209A has a build in oscillator circuit and the coil L1 form a part of its external LC circuit which determines the frequencies oscillation. When there is a presence...

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Simple code lock

This simple code lock circuit described here is of an electronic combination lock for daily use. It responds only to the right sequence of four digits that is keyed in remotely. If a wrong key is touched, it resets the lock. The lock code can be set by connecting the line wires...

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பொக்கிஷங்கள்...

1. பேசும்முன் கேளுங்கள்! எழுதும்முன் யோசியுங்கள்! செலவழிக்கும்முன் சம்பாதியுங்கள்! 2. சில சமயங்களில் இழப்புதான் பெரிய ஆதாயமாக இருக்கும்! 3. யாரிடம் கற்கிறோமோ அவரே ஆசிரியர். கற்றுக்கொடுப்பவரெல்லாம் ஆசிரியர் அல்லர். 4. நான் மாறும்போது தானும் மாறியும், நான் தலையசைக்கும்போது தானும் தலையசைக்கும் நண்பன் எனக்குத் தேவையில்லை. அதற்கு என் நிழலே போதும்! 5....

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