The Triac drivers use the 5 VDC output signal from the 74HC595 chip outputs (Q1, Q2, Q3, Q4, Q5, Q6, and Q7) to switch the 110VAC gate signal to the Triacs. If you are connecting the IC chips directly to the PC, a desktop PC MUST BE USED to drive the electronics in a large system because a laptop computer does not have the voltage required to run
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a large quantity of 74HC595N chips. A laptop can be used in smaller systems (16 channels) but the voltage to the 74HC595N IC chips will need to be lowered since a laptops output voltage is lower than that of a desktop. Add on PCI cards tend to have a lower voltage. Also don`t expect to drive as many IC chips with a laptop as compared to your desktop. In some cases, the parallel port of a desktop will not provide sufficiently high pulses and the Vcc (5 volts DC) to the 74HC595N chips needs to be lowered so the 74HC595 can "see" the pulses from the parallel printer port. The symptom results in some channels working and others not and channels triggering out of order. Here is the catch, if you lower the voltage to the IC chips then the voltage from the outputs of the IC chips also gets lowered and the current from the outputs gets lowered. It may be necessary to lower the value of the limiting resistor from the 74HC595N chip output to the triac driver in order to properly trigger the triac drivers.
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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