Decoder to display ....learning aid

216

02:57:41

A single display has seven segments which can be put together to form any number from 0 to 9 (ignore letters for now).
if a decoder is attached directly across to the display as seen in the diagram above, then any number can be formed just by putting 4 letters together as follows (ABCD as seen on the left of the decoder). They are attached to four individual voltage inputs at the bottom.

A          will display    1  when a voltage is put to it.
B                                  2
A B                               3
C                                   4
A C                               5
B C                               6
A B C                            7
D                                   8
A  D                               9
 all off                           0

Call the four Voltage inputs in the working diagram A B C D  from left to right at the bottom, then alter any of those four.
If a V is 3.6 V or above then it is an active HIGH.
If a V is below 3.6 V then it is considered off as LOW.

Example: 
Alter the four voltage inputs  at the bottom so that only A and C are HIGH with their green lights on bright.
From the table here you can see that number 5 should be on the display.

When you have had some good practice with this then you will realise that a logic high source is something which does that voltage alteration for you.....but that is for another day to use.

published 10 years ago

kiani

6 years ago

⚠ nautorious charlatan poising as expert, 2ctiby is a pathetic parrott,,.

kiani

6 years ago

http://everycircuit.com/circuit/6594477488340992

kiani

6 years ago

Here is the same Nmos that we were looking at in my previous professor waffle: IRF510 from International Rectifier datasheet. Now, it's true that I know nothing about these devices. I haven't used them and I am not aware that they were employed to switch indicators on vehicles. I also have no idea about the uses that electronic design engineering has put them to over the years; includes audio amplifiers, and even 50 MHz 500 watt push pull load sharing amplifier design. Datasheet test details: Prof(on) = 0.03 Ohm Vgfuck = 10 volts VTO = 1 volt but more like 3 Id = 7.3 amp or more In EC here on the left we can see that in this setup: Vds = 0.359 volts Id = 1.2 amp And…this will do nothing for an accurate simulation! So, WTF have I been on about all these years?

kiani

6 years ago

2ctiby is a useless barking mad dog... Just yapping barking.. He thinks he had the monopoly on mosfets....and played fake proffessori... Since we started on mosfets.. He was exposed of lack of knowledge,, , he does not know much about electronics or mosfets.... Now he is just desperatly bitches, and spamms our posts..

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