Electronics > Projects, Designs, and Technical Stuff
3 Dollar Precision Frequency Standard
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jdraughn:
It would increase the cost drastically, but a rotary encoder with push button switch could make a awesome little upgrade.
netdudeuk:
Well, 99p posted for the encoder isn't too bad and even less for the switch.

Let him know when you've written the extra code  ;D
mtdoc:
I bought a set of these today.  This looks like a fun project and it will give me an excuse to learn how to use AVRdude which I've been meaning to do for a while.
netdudeuk:
I finally got round to building one of these today using an M8, the Vectron 10MHz TCXO and the frqpb806.hex firmware.

I connected it to my DS1054Z and a frequency counter like that used by the OP.

Starting off at 5 MHz, the scope shows that and so does the frequency counter, fluctuating by only 1 Hz.

Stepping down, when I get to 625 KHz on the scope, the frequency counter actually shows the second harmonic (1.875 MHz).  Stepping down again and again continues to show the second harmonics on the frequency counter.

Why do I start to see the second harmonics on the frequency counter ?

Any way round this ?

Thanks

mtdoc:
Got this working on the breadboard last night.  Had to remove the crystal on the Arduino Pro Mini and solder a wire to access the XTAL1 pin which is not broken out on the Pro Mini.  Now I just need to put it in a box. I'm still considering whether to use a battery or a power jack. One nice thing about the Pro Mini is it will take unregulated power input.

Thanks to the OP for a fun project  :-+
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