The following is an account of such an undertaking. Recently I was involved in a design review for a cost reduction project, where an older design was getting an update. The new design was a merging of two different designs, including someupdated parts and some existing controls. The design includes six 10Amp H-bridge drivers and the associated control logic. Some of the early testing had shown
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some rather large current spikes and also some higher than desirable amounts of electromagnetic interference (EMI). A consultant who had been helping out on a similar design, mostly on EMI concerns, had suggested a few timing changes to the circuitry. As the talks continued, two different schemes involving changes to the timing were discussed. At this point, I had jumped in and suggested that we pull out all the control circuitry and replace it with a small microprocessor or a CPLD, allowing us some freedom to make changes in the timing schemes. My manager had referred to my suggestion as "a small joke", but I assured him I was serious. A couple of days later I met with my manager and we talked a little more about the idea of handling the bridge control logic inside of a small microprocessor. After we are able to agree that it would in fact be possible (and also a good idea to do so), we quickly defined the desired level of control and the range of the different delays that we would need to consider. Great, we have a plan and a direction. Before we jump into the work, let`s take a moment and analyze the current circuit to determine present functionality and the actual delay times in order to better understand our starting point. The big picture view on the circuit is actually quite simple. Changes in the `Direction` line require proper sequencing of the current source and the bridge drivers. On a change in direction, the...
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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