Simple Digital Counter - doc00021
The basic digital circuits are Flip Flop and Counter, both are
simulated here for you to try out. This circuit can be cascaded
to make even a 6 digit event counter, even a simple frequency
counter can be made.
These are best done with microcontrollers today. Then what if
you have to design your own microcontroller on a FPGA, so the
basics have to be sound, hence you have to know what gates, flip
flops and counters are.
The Counter can be tested by clicking the buttons given below,
Watch the LEDs and seven segment display. Inc, Dec, and Set
buttons are momentary acting and Clk Button is latching
type. The Dip Switch in the Left also can be set by
clicking on each of them, watch the switch and LEDs after a
Set the DIP Switch as you like and then Press the Set button.
Now you will see the BCD value in the yellow LEDs named
4029 output. The Decimal value will be seen in the seven segment
Display. Now try for different dip switch settings and see the
BCD LEDs and Decimal output.
Now Press The Inc and Dec pushbuttons and See the corresponding
green LEDs which indicate the state of the Nand gate 4093 Flip
Flop. Set it to Increment up-count or Decrement which is
Now Click the Clk - clock or count button, the switch will
latch, press it again to release. If you toggle it
once the counter will get a single pulse and it will count it,
see the BCD and decimal displays. Now you turn it on and
leave it, the counter will keep counting one per second
till you turn it off, the clock nand gate is wired to be an
Preset Digital BCD Counter xml
use iframe part for
your Webpage or Blog.
The Counter above is powered up and a power on reset cap across
S4-Preset and S2-Inc is assumed, please add in your circuit.
Also add 104 CD, 0.1uF ceramic disc cap to all the ICs across
the supply pins. (Also add a 104 CD or 1uF cap across Inc switch
and one across the Set switch for power on default settings.)
the circuit in pdf format del00020.pdf
size 126 Kb.
the cadsoft eagle source of the circuit del00020.zip
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