[ARC5] 70.7V Line Transformer for audio matching

[Richard Knoppow]

     Just use the closest impedances and forget about the power. 
The power assumes a fixed amount in the primary, forgot how much. 
Levels of individual speakers adjusted by the mismatch. I don't 
know how much power out the BC-348 has but the more or less 
matched condition may be _very_ loud.
On 1/7/2019 3:31 PM, Mark K3MSB 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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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL