Introduction:
Frequency counter is a very important test instrument for Radio Amateurs, especially those who wish to develop or test circuits. There are lots of frequency counters in the market but building one was never so easy & exciting with Microprocessors doing lots of work for us.
This Frequency counter Project is based on PIC16F84A Microprocessor chip manufactured by
Microchip and software provided by amateurs to help understand PIC programming.
It
measures
only 10cm
x 6cm and
is
designed
on a
double
sided PTH
PCBs.
Revision Note:
FC2, 40 & 400MHZ kits were very successful
& I finished my first lot of PCBs. As I had opportunity to revise
the PCB design, I decided to change few things which came to my mind
by way of preparing kits and suggestions by kit builders.
The basic changes in this version are:
1. Using J309 in place of MMBFJ310
2. Headers replaced by DIP switches
3. On/Off switch added & DC connector
(2.1mm) removed
4. Now only MC12080 is SMT. 400Mhz kits will be
supplied with MC12080 pre-soldered.
Two
versions
of Kits are
available:
40MHZ
&
400MHZ.
Later
model uses
a MC12080
Pre-Scale
IC to
divide
input
frequency
by 10.
Counter
can be
configured
by 4 push
buttons
for IF
off-sets
and other
EEProm
functions.
Refer to
config.
doc given
below for
details.
This
Frequency
Counter is
designed
for radio
amateurs
looking
for simple
frequency
display
for their
VFO
frequency
or QRP
home made
rigs.
It
may also
be very
useful to
add an LCD
display to
your
antique
radios
400MHz
kit comes
with
MC12080 (SOIC
8) pre-soldered
for a
simple,
less than
30 min kit
assembly.
|
FC-2A : Revised 40/400MHZ Frequency Counter
button. 
button
to see
what all
items you
have. You
may change
quantity
if
required
&
proceed to
"Check-out".
