[R-390] Constant current reg for the 3TF7

[Tom Frobase]

I would wouldn,d mind building a circuit board for the circuit.  If
their is other interest please speak up.  Maybe we can defur some of
the cost ... tom, N3LLL

On 2/10/10, Paul Galpin <galpinp at absamail.co.za> wrote:
> Hi
>
> Thanks everybody for the input.
>
> it was, of course, the Dr Johnson regulator in the "Pearls" that I was
> thinking of, and the magic resistor value is  (ta-da, wait for it!)  3.48
> Ohms!
>
> Fortunately. I have two working 3TF7s, but that's the SS circuit that I
> would use when one of them goes o/c.
>
> A couple of people quoted a test that gave constant voltage better than
> constant current for the frequency change, but IIRC that test was using the
> 3TF7 as a "constant current" regulator, which by today's standards is
> certainly NOT the case!
>
> Anyway, thanks everybody for the help!
>
> Paul Galpin
> ZS2PG
>
>
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