This is essentially the simplest circuit with additional indicator LED`s and appropriate resistor values. The dotted line is to indicate that the IR LED is separated by a length of wire (telephone cable in this case) from the rest of the circuit. The linux infra-red daemon lircd pulls the RTS (ready-to-send) serial line positive (about +12V) as pa
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rt of its initialization. This circuit uses that to light a green LED indicating that the driver is loaded and basic connections are at least superficially in order. Lircd transmits IR signals as a series of 38Khz pulses on the DTR (data-terminal-ready) line. Equipment with IR receivers will pick-up the pulses from the IR LED. Humans can see the pulses from the red LED. This is a low power IR transmitter intended to be attached to the front of or very near (1-2 ft. ) the receiver box. I`ve found it very reliable in this range. Both LED`s are visible and the red flash LED easily catches the eye. If you know nothing else about electronics theory you should at least learn Ohm`s law. It easily determines the entire operation of this circuit. Note the following points: I measure the positive RTS and DTR voltage at about +11. 5V on my machine. It`s not recommended that you draw more than say 10-12mA from the serial chip. Using these values and applying Ohm`s law to the green LED: RTS and DTR may also be negative and -12Volts would likely damage the LED`s. The 1N914 (or 1N4148) diode protects them. There should also be a diode protecting the green LED but I`ve not found this necessary with my specific hardware. 1N914 is the radio shack component number for the diode. Anything reasonable would work here and other circuits suggest 1N4148. The green and red LED`s are smaller ones from a radio shack variety pack and the IR LED was...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
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The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
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This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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