NOTE: This is currently under construction. Functionality not verified !
Now, as all counting IC's diceased, (you certainly know this : a superb circuit proposal either needs parts which nobody knows,
or parts you cannot buy any longer or parts which have an astronomical price :-)
In order to have some future prospects, this design is based on an Atmel™ ATmega. We use the ATMEGA324P™ because it can run at 20 MHz,
which are easily obtained by a Frequency Doubler and the 'Standard' 10 MHz Reference Clock. Running that fast, the Counters can
handle Frequencies up to about 9 MHz. (66 MHz with Prescaler 74HC390)
For the nostalgics among you,
we used a VFD (Vacuum Fluorescent Display) which is currently available at a very low price at various distributers ...
To make it even more attractive, the software can calculate offsets and ratios. As the chosen VFD has an
IR-Receiver 'on board', it even can check your remote control ...
You can choose between an external 10 MHz Reference, a standard 10 MHz XCO and a homebrew 10 MHz OCXO.
Whatever you choose is available at a rear output to sychronise other devices.
Last but not least a serial interface (RS-232) transmits the measured values to other devices.
Share your thoughts.
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