Low Cost Multifunctional Frequency Counter
We are introducing a low cost multifunctional seven digit LCD frequency counter, for your HAM radio shack. This frequency counter is designed in such a way that it can be used for direct frequency measurement or with any of the commercial / home made radio/transceiver as a digital frequency display. The power consumption of the counter is very low. It could be operated with even an ordinary 9V battery for a long period.
This frequency counter contains only a few components. The brain of the unit is a PIC 16F84 micro-controller. The LCD display used is a state of the art, commonly available 16 characters dot matrix in one line unit. The other main attractive feature is the use of a single transistor as the input amplifier, which will give a sensitivity of less than 150 m.V with a very high bandwidth. With this, the counter is useful for the measurement of a wide variety of input wave forms without loosing the accuracy. The counter is capable of measuring frequency up to 35MHz in normal condition and is suitable up to 3.5GHz with pre-scalar.
Any IF frequency can be programmed into the available seven channels, as per the requirement of the user . We have pre-programmed the most commonly used frequencies such as 9, 1.6, 10, and 4 Mhz.
Bottom View (Size 80mmX52mm) Component side view
This is another version of frequency counter using PIC16F628A instead of PIC16F84A written by VU3CNS using the same circuit shown above. 10 IF offsets and 1 direct counting options are included. You can select a Gate period of 1 Sec or 125mS with 1 Hz or 10Hz accuracy respectively. Download hex, source (asm) files and circuit from .
The components used in this circuit are easily available in the electronic market. This circuit can be assembled for less than Rs.500/-.
We wish you good luck in this new project and happy home brewing. This frequency counter will be a great asset for your HAM Radio shack. If you require any assistance while assembling the unit ,you can get clarifications from VU2XTO, VU2RYL or VU2ITI. Your suggestions and comments on this project may be put to the Forum on this web.