00:04In this video we're going to make a counter, without programming or a PIC microcontroller, using a 74LS47 decoder.
00:11integrated circuit decoder, controller that converts a binary code input
00:154-bit BCD signals to display numbers from 0 to 9 on a 7-segment display, using
00:21a switch, which will send 5 volts DC to the decoder when the switches are activated
00:27From the switch, to off, low and on, high, between 0 and 1, binary, will allow you to see it in numbers
00:36Decimal 0 to 9, units and tens. Let's begin, we'll look for the 74LS47 decoder, we select
00:452, in the sources section, we look for ground, for the ground pins, we look for power or source
00:545-volt DC power supply, in indicators we look for a 2-segment 7-segment display,
01:00common anode, we're looking for a revac, here we have several resistors together in a block, 330 ohms.
01:10For the operation of the switchboards, we selected an 8-switch unit.
01:15Let's go to sources, look for a 5 volt DC source, we make the resistor block with
01:27a measurement of 330 ohms, we fixed the component positions, the input pins we moved to
01:41The power supply, we make the connections, then we go to the bus, we count 4 connections,
02:08And we created the bus, we changed the name of the bus, from name B, we counted 4 connections, and we created the bus.
02:22We change the name of the bus, from name A, we go to bus, we make the connection between the encoder and the display,
02:32We changed the name of C, and for the second decoder we also drew another bus named D,
02:43Here's an important point: to name the connection between the bus and the encoder, we first make the connection.
02:49Each connection is assigned the name of the decoder to each pin; we have A, B, C, D, in this way...
02:56It establishes a bus connection; it is a shared physical channel, formed by a set of conductors
03:01metallic traces on a PCB or cables,
03:28We perform this process for each connection, observing the names of each one.
03:32fine element.
04:12For the resistor block, we drew a bus named B, and another bus named A, we performed
04:18The connections as mentioned, and we ground this block of resistors.
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05:02We move on to the simulation; when we press play, we start at zero. On the right is a list.
05:07of numbers, binary from zero to twenty, so with this reference we write from one
05:12From left to right, we flip a switch, because the decoder is already converting from binary
05:17to decimal, we have gives us one.
05:20For the number two, we see the binary number, one and zero, counting four bits, zero, and we go up
05:26One gives us two, for three we first observe the binary number one, one, we go up
05:32two switches we get three, we can continue this up to ninety-nine.
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05:59That's all, great! If you found the video helpful, don't forget to subscribe.
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