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
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 click.
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 down-count.
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 oscillator.
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
the circuit in pdf format del00020.pdf size
the cadsoft eagle source of the circuit del00020.zip
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