[K3] Audio Output Power ??

[Phil Hystad-3]

If I remember correctly, there are two different audio amplifier circuits in the K3.  One for the speaker and one for the headphones (or, it may be more complex then that).

Does anyone know the power output level of the speaker audio amplifier?

73, phil, K7PEH

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[Joe Subich, W4TV-4]

The LM4950 is rated at 3.1W per channel to a 4 Ohm
load with 1% THD+N.

The spec sheet shows THD increasing significantly once
output goes above about 2.3W into 4 Ohms, above about
1.8 Watts into 8 Ohms and above about 900 mW into 16
Ohms at 12V.  THD is below 0.03% until the "knee" is
reached.  Increasing Vdd from 12 to 13.5V increases the
available output by about 25% based on the charts
included in the data sheet.

73,

    ... Joe, W4TV


On 3/15/2011 9:31 PM, Phil Hystad wrote:

> If I remember correctly, there are two different audio amplifier circuits in the K3.  One for the speaker and one for the headphones (or, it may be more complex then that).
>
> Does anyone know the power output level of the speaker audio amplifier?
>
> 73, phil, K7PEH
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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