Control the two digits representing minutes; this circuit includes two shift registers, 30 resistors, and 30 LEDs. (All told, a particularly simplecircuit, really. ) Here`s the schematic: As I came closer to completing the circuit design, it occurred to me that trying to solder all of these components on a simple prototyping circuit board would be onerous at best. (If you`ve ever done this kind of thing before, you know what
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I`m talking about!) Typically, prototyping boards have a matrix of pads for placing components, but no embedded traces connecting components to each other (or, if they have pre-printed traces, they are usually not in the most useful places). So I began researching designing a printed circuit board specifically for this circuit. There`s a plethora of freeware available to download for this purpose; many packages come with schematic drafting software as well, and are able to link the PCB design to the schematic, which greatly assists with ensuring traces connect the correct pads. The package I chose was ExpressPCB and ExpressSCH; I like the interface and the company provides low-cost PCB board printing, if you`re willing to wait a little while for them. (For the record, I`m not endorsing their product or their company per se-it works for me, but it may not work for you. ) Then I got restless. I didn`t want to wait the month for ExpressPCB to print and ship my board. I wanted it right now! (I mean, the name of the company is "express, " after all. ) I remembered that a few months ago I had stumbled on a website with some crazy scheme for home-printing PC-boards, using some complex combination of laser printers, acids, and duct tape or something. So I did some additional researching and discovered that printing a PC-board at home is much simpler than I imagined, and significantly cheaper than having a professional shop do it,...
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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