[time-nuts] Ancient OCXO in scope calibrator.
Bruce Griffiths
bruce.griffiths at xtra.co.nz
Sun Sep 7 18:38:12 EDT 2008
> Dave
>
> Need a few more circuit details.
> The crystal current wont be very high unless their are other components
> connected to G1.
>
> Bruce
>
>
The anode G1 capacitance is about 10fF so with 25V rms at the anode, the
crystal current would be around 16uA if the circuit relies on feedback
via the anode to grid 1 capacitance.
This seems to be a little low to be useful.
You could try substituting a newer 7587 there are several currently
available on ebay and elsewhere.
Bruce
More information about the time-nuts
mailing list