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matrix of 100 Led By-Pass Ethernet

This circuit is an oscilloscope to LEDs, but is far from being a tool for laboratory use is didactic and the learner's.
It employs an array of LEDs 10 x 10, a Johnson counter in this case the CD4017 that has 10 outputs, which we use to generate the horizontal sweep. And the vertical sweep is developed according to a VU meter LM3915 is 10 levels.

Both the input gain and horizontal sweep speed is set using two potentiometers, the input level is varied at the entrance of LM3195 and base horizontal sweep time is varied by potentiometer commands the LM555 timer the CD4017 clock.

The following diagram show the address and PCB. This

link is the PCB in pdf format ready to print on transfer paper.

upgrade the circuit here some photos taken this day as the arm recently to test it, there is also a video.

Testing with Signal Generator:

Testing with Music:

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For some network topology complex, for example Modem Switch in a room, another switch in a part of the house (upstairs) and another switch in another part of the house (ground floor), the downside is when the modem is disconnected from the Internet happens. Then you have to go and reset the modem hardware because from intranet says reboot, but do nothing ...
The problem is that to get to restart it is to open 3 doors and cross the yard, either night and day, cold, heat, rain, meteorites and other ...
The idea is as follows, by a single Ethernet cable UTP cat-5 or Level-5, passing the connection IEEE over the telephone line, as the Ethernet standard requires 4 connections TX +, TX-, RX + and RX- 4 pins left over and most of which take two and added the phone connection, so I have a By-Pass in the part where I had the modem before and then hooked the phone, the switch (as it was before) and UTP which flows to another plant where I have By-Pass the other taking the Ethernet and phone connection to power the modem.
Here is the diagram:

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phase motor controller Infrared Barrier

This circuit is designed to test low voltage AC motors and power, for example those used in PC hard disks or the CD player.
The circuit works by generating a cyclic burst of pulses in the three coils, thus achieves the rotor displacement.
You add a speed control to tune the engine more responsive.
The main blocks are based on 555 timer, this timer control motor speed. The sequencer on the basis of 4017, with the blast generated sequences for the three coils, and finally the stage of power based on power transistor TIP31C NPN (should dissipate).
The circuit is as follows:

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Full

The following circuit is an infrared barrier, designed to apply to a central alarm, had several versions, this is 2.0 which differs from the 1.0 per carry greater distance.
Version 1.0 was almost the same as this but instead of having a driver based on the ULN2003 transistor array, only had a 2N3904 transistor and 4 IR LEDs. 1.0 In the receiver
was equal to this but instead of having an infrared module three terminals, had only one photo transistor and a filter.
This new version 2.0 works just like 1.0 but to have 14 infrared emitters and a receiver three-terminal semi amplified, we can achieve greater range, of course we can also add a lens on the receiver and much larger.
Performance, is based on two integrated firm HT12D Holtek HT12E and already used in several projects of this blog. These two integrated
are 8bit and 4bit data encryption, both the encoder to the decoder.
in the circuit is not used all 4 channels but could be a new version of the circuit using these channels to create different areas to interconnect all sensors and each other.
The circuit is as follows: