I don't think this design would be acceptable in modern consumer
equipment, at least not in Europe. Typically they would have an
auxiliary power supply for the microcontroller, to reduce power
consumption to well under 1 watt, and maintain a reasonably good power
factor, when in a soft power off state.
Current and voltage figures quoted elsewhere in the thread suggest over
10 watts and an unknown number of VA. There was a lot of campaigning to
hard power off devices at a time when standby powers were more like 5 watts.
On 01/07/2021 00:09, Jack Brindle wrote:
It is powered by the 5V linear regulator, which is providing the heat you feel,
along with the +12V and -12V regulators (also linear). I seem to recall that
the input to the regulator is something like +15 or +18V, which gets regulated
down to the three supplies that are used for running the microcontroller the
RS-232 interfaces and the LCD. The LCD is disabled when front-power is off.
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com
