[time-nuts] Fury Interface Board simulation results

Bruce Griffiths bruce.griffiths at xtra.co.nz
Tue Dec 11 01:32:49 EST 2007


xaos wrote:
> Hello Everyone,
>
> I have been running simulations of different parts of the Fury Interface 
> board.
>
> Here are the results so far.
>
> http://www.darksmile.net/ee/index.html
>
> Your feedback is most welcome.
>
> -George
>
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>   
George

In the JFET frequency doubler:
1) Surely the 50 ohms should be is series with the the voltage source V3
for the simulation?

2) Usually a 1:4 impedance ratio step up transformer on the input is
about right with a similar transformer used to step down the output
(perhaps an even higher impedance ratio transformer (8:1, 9:1?? may be
better). The maximum turns ratio depends somewhat on the maximum
allowable drain voltage swing which in turn is limited by the drain
supply voltage.

In the voltage offset circuit:

1) The junction of R9 and R12 should be connected to the offset source
(+5V??).

I dont understand what the 7812 does in this circuit.

Isolation amplifier looks OK.

Bruce



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