[ARC5] Line-transformers to replace shot audio transformers.

[Dennis Monticelli]

Good finds, Ken.

Line transformers have no flux gap.  They are not designed to pass DC so
saturation can be a concern.  However, a 5W or 10W line transformer should
be OK passing the modest Class A bias current of a command receiver.

Dennis AE6C

On Thu, Sep 29, 2016 at 7:52 PM, Kenneth G. Gordon <kgordon2006 at frontier.com
> wrote:

> I just found another source for those transformers, and the price is
> $3.95, but the highest
> impedance is around 10K, and the next one down from that is about 5K. That
> is a 5W job.
>
> Outputs are 4 and 8 ohms.
>
> And a 10 watt job from another source (Parts Express) for $4.90 with a
> primary tap at 8K
> and secondaries of 4 and 8 ohms.
>
> Anyway, these are 70.7 V "line transformers".
>
> Radio Shack used to sell one, their 32-1031, which did 4, 8, or 16 ohms,
> up to 10 watts, and
> had an 8K primary tap.
>
> One "nice" thing about these is that they can handle high voltages (easily
> at least 250 VDC)
> and their frequency response is usually very good: like 30 to 100KHz.
>
> Anyway, this is something to think about for our favorite receivers which
> have shot audio
> output transformers...
>
> Ken W7EKB
>
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