[ARC5] 70.7V Line Transformer for audio matching

[Mark K3MSB]

Gents --

Many thanks.  From a purely pedagogical perspective, is the way I've shown
the correct way to compute the primary impedance tap given the line voltage
value and power taps?

73 Mark K3MSB

On Mon, Jan 7, 2019 at 6:38 PM Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> Nothing is going to break from a mismatch at audio. One “traditional”
> approach
> is to switch taps until you find the one that is loudest or “sounds best”.
>
> Bob
>
> > On Jan 7, 2019, at 6:31 PM, Mark K3MSB <mark.k3msb at gmail.com> wrote:
> >
> > Hello all.
> >
> > I need to match the 4K audio output of my BC-348-R receiver to a
> standard 8 ohm head set.
> >
> > I have a Stancor A-8102 70.7V line matching transformer on hand.
> >
> > The catalog shows the 8102 can handle 625, 1250, 2500, 5000 and 10000
> ohms primary impedance
> > and provide secondary impedances of 4, 8, or 16 ohms.
> >
> > The power options are 8,4,2,1 and 0.5 W.
> >
> > So... the impedance of the various wattage taps is computed by
> >
> > Z = E**2 / Pwr where E = 5000
> >
> > So my closest match would be the 1W tap (5000 = 5000 / 1).
> >
> > Is this correct? Hate to zorch something.....
> >
> > My other option would be to use the Lo-Z output on the BC-348-R (300
> ohms) and pump that into my existing 600 ohms to 8 ohm box.
> >
> > 73 Mark K3MSB
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