🚀 go-pugleaf

I am looking for a CHEAP circuit which can generate a sine wave at a
dialable frequency between .01 Hz and 3000 Hz with .01 hz precision.
The voltage out needs to be adjustable between 5 volts and 24 volts
AC (not DC).  I already know about all the function generator chips
available, and will probably use these... the catch is that I also
need a CHEAP way of displaying the frequency, in hertz, on a LED or
LCD display.  I would like the entire device to cost no more than $50.

I anyone knows of a chip which could take the pulse output of one of
the function generator chips and display it on a LED or LCD display,
and that the method is dirt cheap, please let me know.

FYI.. the device is for a CES machine (cranial electro stimulation) where
I hook the electrodes to my head and the waveforms sync my own brainwaves.
I already have done this with a HP function generator, and it works GREAT,
but I want a pocket, portable, CHEAP unit that I can take everywhere.

Thanks In Advance          -- uunet!epicb!david