[ARC5] 70.7V Line Transformer for audio matching

[Meir Ben-Dror WF2U]

I concur! That’s what I always did with the line transformers. Hook up the speaker to the secondary according to the speaker impedance. I connect a scope to the speaker terminals. Change taps until the amplitude is the largest. All set!

73, Meir WF2U
Landrum, SC

Sent from Mail for Windows 10

From: Bob kb8tq
Sent: Monday, January 7, 2019 6:38 PM
To: Mark K3MSB
Cc: ARC5
Subject: Re: [ARC5] 70.7V Line Transformer for audio matching

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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