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1 MHz Frequency Counter


1 MHz Frequency Counter
The XR 2206 function generator chip is a very popular device and forms the basis of many analogue function generator designs. A disadvantage of this chip is that in its most basic configuration the output frequency is adjusted manually by rotating an output frequency control knob and lining it up on a printed scale. Without a frequency counter its difficult to tell the value of the output frequency, especially at the high end of the scale. The frequency counter design presented here offers a low cost solution to this problem and achieves good accuracy.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Extra info, Update
The original software contained a few errors and a new version may be obtained from our website (ref. 030045-11.zip).
The software has been written for a 4.194304-MHz quartz crystal. To enable the microcontroller to be used with an 8.388608-MHz crystal, the program has to be modified as explained in the source code file, and then compiled again.
R1 = 10k
P1 = 1k preset
C1, C2 = 27pF
C3 = 1µF / 16V radial
C4, C6 = 100nF
IC1 = 78L05
IC2 = AT90S2313-10PI, programmed, order code 030045-41
X1 = 4.194304MHz or 8.388608MHz quartz crystal (see text)
LCD1 = LCD Module, 1 line, 16 characters
PCB, ref. 030045-1
project software, ref. 030045-11
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