The infrared detector module (GP1U52X) (Radio Shack 276-137) provides a 5 volt TTL pulse train corresponding to the digital code to the button of the remote control. In the lower circuit, the module output normally low a signal and a positive going pulse train whena signal is present. Other detector modules that an inverted output is in the upper drawing, which showed type I,
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but I do not have the part number, I think from a video recorder. The pulse sequence, the digital codes of special keys is available with information directly from the manufacturer. Since the pulse train occurs, the 4. 7uF capacitor charges to approximately 3 volts and the capacitor voltage minus a diode drop appears above the 470-ohm resistor, a collector current of the 2N3904 or 2N3906 about 5 milliamperes. The collector current of the first stage flows into the base of the output transistor (2N3053 or MJE34), which provides about 250 mA in direction. If the pulse train ends of the capacitor discharged slowly through the bottom of the first transistor stage left, the Christmas tree lights for about 1 second. The little Christmas lights will operate over a wide voltage range, so you can use bulbs from almost any string, but spheres of short strings (35 or less) will probably run longer at least 5 volts. The circuit can be a small 9-12 volt DC, 250 mA wall transformer or operated higher. It can also be an additional 1000 uF capacitor filter on the DC output if the wall transformer no built-in capacitor. For use with a 9 volt battery, the light bulbs are replaced by a simple LED and 680 Ohm resistor and the output transistors by low signal transistor (2N3904 or 2N3906) can be replaced. The total power is about 25 mA with LED lights, standby and 15 mA when the LED should be.
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....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
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....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
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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