[Amps] Solid state relays..again

[Brian Carling]

The little black varistor thingies work quite nicely for eliminating that "THUMMMPP!" in small to medium-size equipment.

I don't really know what they are but somebody gave me a whole bunch of them a while back. I have two or three different sizes.

Best regards - Bry Carling



> On Feb 13, 2014, at 10:08 AM, Jim W7RY <w7ry at centurytel.net> wrote:
> 
> That's why I put step start in my large Astron power supplies. No more thump. No more blown up power switches.
> 
> 73
> Jim W7RY
> 
>> On 2/13/2014 4:01 AM, Ken Durand wrote:
>> " And this, my dear friends, is why equipment with steel boxes and big
>> transformers inside can make that "WHummpppp" at the moment it's switched
>> on.
>> 
>> Of course, in equipment controlled by a simple mechanical power switch, it's
>> impossible to decide when exactly in the cycle the switch will close. It's
>> this a lottery how close we will get to the peak voltage point, or the zero
>> crossing. That's why sometimes the "WHummpppp" is strong, sometimes weaker,
>> and sometimes even non-existent."
>> 
>> Thanks for that bit of wisdom Manfred. I never could figure out why
>> sometimes I get the "WHummpppp" and other times the sound would be quite
>> different or non-existent like you described.
>> 
>> Ken
>> N4zed
>> 
>> -----Original Message-----
>> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Manfred
>> Mornhinweg
>> Sent: Wednesday, February 12, 2014 12:56 PM
>> To: amps at contesting.com
>> Subject: Re: [Amps] Solid state relays..again
>> 
>> Hello,
>> 
>>> Once in a while that thing turns on with a WHummpppp and a low
>>> frequency ringing that just trails off.
>> Let's see if I can explain this in a way everyone can understand.