9 BIT counter with 74LS90 IC's

data to follow
512 counter
9 bit binary counter built from 3 x TTL 74LS90 ic's.
8 bits are one byte so basically this is a 2 byte counter.
By adding one more 7490 the capacity is greatly increased to 4096 which would make it a 16 byte counter and capacity eightfolded.
TTL IC's work on 5 Volts DC

Parts required for this counter
3 x 74LS90 IC's
9 x 300 or 330 ohms resistors ¼ Watt
9 LED's (10 millimeter) any size or colour can be used.
some Vero board and hook up wire.

I used the 10 or 1 Hertz pulse from my breadboard set up. so you may have to make up a 555 timing circuit to clock the A(14) terminal of the first TTL IC.

Category:

Science & Technology

Tags:

• 7490
• 74LS90
• TTL
• 9_bit
• counter
• 256
• 512
• binary
• teller
• compteur
• contatore
• shift
• register
• LED
• small
• projects

[jesaac0912]

hello again, do you know the parts used here in this memory game? or do you know another simpler way to do this game using ICs? thank you =)

[RODALCO2007]

@jesaac0912 The IC's are old TTL IC's (type 7490) which should be available easily and cheaply.

You could use a PIC controller IC and keep all in one IC.

[jesaac0912]

uhm, can i ask ,what capacitor did you used?

[RODALCO2007]

@jesaac0912 Cap value is not critical. These are 1 uF 50 Volts. as the ic's run at 5 Volts. even 6.3 Volt caps can be used.

They are to stabilize the 5 Volts supply.

[roflector5000w]

how that works

[RODALCO2007]

@roflector5000w There are IC's which can do it all by itself like PIC IC's.

I had these 7490's laying around and decided to built one of these.

My next project is a 15 bit Christmas star.

[RODALCO2007]

@jesaac0912 jesaac0912 has made a comment on 9 BIT counter with 74LS90 IC's:

oww, thank you! =D oh another thing, what is the meaning of CLK in your schematic diagram? is it clock pulse? thank you very much!

Correct. it is clock pulse

[jesaac0912]

@RODALCO2007 oww, thank you! =D oh another thing, what is the meaning of CLK in your schematic diagram? is it clock pulse? thank you very much!

[uwtitanfan]

@BarneySaysHi The song is "Smile" by Tangerine Dream

[epd807]

Great video Ray!!