Q3 is the external relay keying transistor, typically used to key an
amplifier. It is operated as a saturated switch, and has extremely low
"on" resistance, so it dissipates little power. We use a virtually
identical device in the KPA100 (K2/100 amplifier option).
73,
Wayne
N6KR
On Sep 12, 2007, at 7:54 AM, Roy Morris wrote:
It appears that Q3 is heat sinked directly to the PC board on page 13.
Is this correct? Roy Morris W4WFB
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