This controller is essentially 3 pairs of LED sensors in a 3G -bridge configuration. The driver is capable of operating 3 actuators. The motors are connected in a Delta configuration. The apexes of the delta are connected to the center connection of each half-bridge. Of course only 2 actuators are required as the third is stationary and fixed. Whe
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n a pair of LEDs turns on the associated top SCR the bottom SCRs of the other half bridges is turned on and movement of the shadow mask is toward this LED. If 2 or more LED turn on conditions occur multiple SCRs in both the top and bottom will fire. In many circuits this would be a disastrous condition, however, in this circuit the only thing that happens is there is no movement and the storage capacitor is discharged. Actually this condition won`t happen in normal circumstances when the light is bright. The LED sensors are arranged in a circle of 6 with a shadow mask sized to exactly illuminate each LED 50%. They are connected in pairs at opposite sides of the circle. A picture is worth way more than a thousand words. As US4798949 and US3945015 teaches us that a U-joint keeps the mirror from tipping I have a rigidly mounted U-joint at the top. The other U-joints could be ball joints if one can find ball joints that can take high angles. US4798949 needs the other 4 U-joints because of the use of linear actuators. These generally require that the far end be prevented from rotating. The U-joint solved this problem for him. But technically, only the single lower U-joint prevents the mirror from tipping. I worked out a method where I can eliminate the need for limit switches in the actuator. If a crank is used the motion can`t run into the end and jam as in a linear actuator. The protection limit switches can be eliminated. My...
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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