[Amps] Warm up and on time question...

[Carel, pc5m]

Hi Mike,

Have a look at: http://www.pc5m.net/projects/filament-inrush-protection

Is in use for my TH289 (45amps of filament current) amplifier.

Gl, Carel

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Mike Baker
Sent: donderdag 15 december 2011 4:39
To: amps at contesting.com
Subject: Re: [Amps] Warm up and on time question...

Speaking of warm up times and filament life got me to thinking about a
ramping switch system for the whole power supply.
As I understand it there are devices which will chop up the AC sine wave
into pieces like a PWM and slowly add more and more pieces until the full
sine wave is present on the load. I also understand they can be used in
reverse. Sort of like having an electronic Variac on the input side of the
supply.
Do any of you have a circuit diagram for such a system or could point me in
the right direction?  I am not even sure what to call what I am looking for.
It sounds like a ramping soft start system and that would solve a lot of
problems with initial turn on of the filaments and the Plate supply.

Thanks in advance.

Mike Baker  K7DD
K7dd at cox.net
All QSO's are uploaded to LOTW and EQSL.



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