I've often started with 10n to 100n and a 100R resistor. I use resistors
with a body length of around >10mm for handling 240Vac and I use mains
rated capacitors or >600Vdc. I like the modern X and Y caps specifically
made for mains voltages. Having a large resistor in series limits impulse
currents, but these are rated for self-healing and handling large spikes in
the the 2kV bracket directly across the mains, so there's no risk of
breakdown in this service. Used to buy RIFA combination R and C devices if
tight on space.
http://www.evoxrifa.com/cap_catalog/rc_units/pmr209.pdf
also an interesting article on ventilation
http://www.evoxrifa.com/n_america/vent_grilles.htm
David
G3UNA
----- Original Message -----
From: "Johnnie Walker" <keepwalking188@yahoo.com>
To: "Paul Kraemer" <elespe@lisco.com>
Cc: "John Lyles" <jtml@losalamos.com>; "'AMPS'" <amps@contesting.com>
Sent: Thursday, January 29, 2009 6:46 PM
Subject: Re: [Amps] Crydom Solid State Relays
> Hi Paul,
>
> What would be typical values for the cap/res combo?
>
> 73/jeff/ac0c
>
> Paul Kraemer wrote:
>> There is the Quencharc but they are pricey. Just
> make your own using 630wvdc
>> poly caps and 1/2 watt resistors.
>> Give me a load you are working with and I can point
> you in right direction
>> for calulating values.
>> Paul K0UYA
>> ----- Original Message -----
>> From: "Tim Duffy K3LR" <k3lr@k3lr.com>
>> To: "'Alex Eban'" <alexeban@gmail.com>; "'AMPS'"
> <amps@contesting.com>;
>> "John Lyles" <jtml@losalamos.com>
>> Sent: Thursday, January 29, 2009 1:19 AM
>> Subject: Re: [Amps] Crydom Solid State Relays
>>
>>
>>
>>> Is there a suggested Mouser available "snubber"
> capacitor R/C combo that
>>> has
>>> worked well?
>>>
>>> Maybe you or John know the correct part for us?
>>>
>>> Thanks
>>> 73,
>>> Tim K3LR
>>>
>>> -----Original Message-----
>>> From: Alex Eban [mailto:alexeban@gmail.com]
>>> Sent: Thursday, January 29, 2009 1:10 AM
>>> To: k3lr@k3lr.com
>>> Subject: RE: [Amps] Crydom Solid State Relays
>>>
>>> ...the Crydoms are "quieted" inside, so they don't
> need RFI protection!
>>> However, I would warmly recommend to include a
> snubbing capacitor across
>>> the
>>> power pins just like you do with regular relays.
>>> This is meant to prevent switching transients from
> "roasting" the power
>>> section of the relay.
>>> Alex 4Z5KS
>>>
>>> -----Original Message-----
>>> From: amps-bounces@contesting.com
> [mailto:amps-bounces@contesting.com] On
>>> Behalf Of Tim Duffy K3LR
>>> Sent: Thursday, January 29, 2009 7:27 AM
>>> To: 'Bob Maser'; 'AMPS'
>>> Subject: Re: [Amps] Crydom Solid State Relays
>>>
>>> Hi Bob:
>>>
>>> I have used Crydom SSR relays in AC ON and step
> start circuits for 15
>>> years
>>> with no special bypassing. No problems at all with
> this set up.
>>>
>>> 73,
>>> Tim K3LR
>>> http://www.k3lr.com
>>>
>>>
>>> -----Original Message-----
>>> From: amps-bounces@contesting.com
> [mailto:amps-bounces@contesting.com] On
>>> Behalf Of Bob Maser
>>> Sent: Wednesday, January 28, 2009 7:08 PM
>>> To: AMPS
>>> Subject: [Amps] Crydom Solid State Relays
>>>
>>> The power supply of my new amplifier will be using
> 3 40A Crydom SSR
>>> relays,
>>> One on each leg of the 240VAC and another in one
> leg to short out the step
>>> start resistor. I have been planning on using the
> SSR's w/o any resistors
>>> or capacitors across the control connections but I
> have been advised that
>>> I
>>> should put resistors and capacitors across the
> control connectors to
>>> prevent
>>>
>>> RF from affecting the SSR function and possibly
> causing "chatter". I
>>> would
>>>
>>> appreciate some feedback from the group. I don't
> believe that Jerry
>>> Pittenger K8RA used anything in the 3CX1500D7 amp
> that was featured in the
>>> 2006 ARRL Handbook.
>>>
>>> Bob Maser W6TR
>>>
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>>> 7:24 PM
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>>
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