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Re: [TCML] Suitable MMC Capacitors
yeah.... i agree with you about the salt water capacitors.... i almost never
use premade caps for my projects.
On Mon, Dec 7, 2009 at 1:55 AM, Paul Brodie <pbbrodie@xxxxxxxxxxxxx> wrote:
> D.C.,
> Please don't take this wrong. I'm not trying to be smart about this. I am
> asking you seriously.
> Which inexpensive MMC caps are you referring to that can be bought for the
> $40 from washing a couple of cars. Last I checked, the CD 942 caps run about
> $5.80 a piece when purchased in quantity. If Brandon were to build the
> recommended .008uF MMC tank cap, he would need 18 of them to get .0083uF at
> 36kV, which is approaching the 2.5 times the neon sign transformer voltage
> you recommend. So, to build this MMC, Brandon would need to come up with at
> least $104.40 for the caps alone. That is just for the caps and doesn't
> include bleed resistors or anything else required to build the MMC. If there
> are less expensive MMC type caps he can buy, will you please tell us what
> they are and where he can get them, if you know.
>
> I really like Jim Lux's recommendation to build salt water caps but it
> isn't my project. I'm just trying to help out. I did tell Brandon that I
> completely agree that Mylar caps are all wrong and not to use these caps. I
> was not aware that they are Mylar.
> Paul
> Think Positive
>
> ----- Original Message ----- From: "DC Cox" <resonance@xxxxxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Sunday, December 06, 2009 4:52 PM
> Subject: Re: [TCML] Suitable MMC Capacitors
>
>
> The Fair Radio caps are DC filter caps. If you buy them and then they
>> blow,
>> you are out your money plus more money to replace them.
>>
>> Use MMC type caps. They are proven, will work, and won't fail like the DC
>> filter caps will.
>>
>> Just offer to wax a neighbor's car for $20. Two cars and you have $40 and
>> you can buy the inexpensive MMC caps. Car washing and waxing are just two
>> methods you can use to make some money to buy the caps you really need for
>> this project.
>>
>> Cutting corners on caps will just give you failure and it's not worth the
>> headache.
>>
>> Dr. Resonance
>>
>>
>>
>>
>> On Sun, Dec 6, 2009 at 11:47 AM, Paul Brodie <pbbrodie@xxxxxxxxxxxxx>
>> wrote:
>>
>> That is the correct list I was telling Brandon about but it is going to
>>> be
>>> of little help.
>>> Brandon, you are not building the type of MMC that is usually being built
>>> by other TC builders.
>>>
>>> For everyone to understand what is going on, I was attempting to help
>>> Brandon find some caps to use to build a tank cap as inexpensively as he
>>> can
>>> and still work with his 15kV 30mA neon sign transformer, as he is on a
>>> very
>>> tight budget. The caps we are looking at are only selling for 3 for $12.
>>> I
>>> located these caps at Fair Radio for him that are rated .01uF at 10kV. He
>>> wants to use 4 in series to get .0025 at 40kV and put together 3 strings
>>> of
>>> these to get .0075 at 40kV. I actually recommended 3 strings of 3 caps to
>>> get more capacitance, .01uF at the lesser voltage of 30kV, but he wants
>>> the
>>> extra voltage rather then the extra capacitance and says they will fit
>>> his
>>> budget. JavaTC recommends .008uF for his setup and I have always gone
>>> with a
>>> little bit more capacitance rather than less when given the choice. If he
>>> had the money, I would actually prefer he went with 4 strings of 4 caps
>>> to
>>> get .01uF at 40kV but I suppose that is immaterial.
>>>
>>> So has anyone got any advice for us, taking into consideration that the
>>> usual Cornell Debilier caps are out of the question due to cost. If you
>>> make
>>> a recommendation, please try to keep the cost under about $50 for the
>>> caps.
>>> That has been a very stiff requirement for me to meet, so far. Thanks
>>> everyone.
>>> Paul
>>> Think Positive
>>>
>>> ----- Original Message ----- From: "bartb" <bartb@xxxxxxxxxxxxxxxx>
>>> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
>>> Sent: Saturday, December 05, 2009 4:03 PM
>>> Subject: Re: [TCML] Suitable MMC Capacitors
>>>
>>>
>>> This document is a bit old, but the only one I know of.
>>>
>>>> http://www.classictesla.com/hot-streamer/TeslaCoils/MMCInfo/good-bad.txt
>>>>
>>>> Take care,
>>>> Bart
>>>>
>>>> Brandon Hendershot wrote:
>>>>
>>>> I've heard rumors of a list in the archives consisting of caps known to
>>>>> work well in MMC's, and caps known NOT to be used in MMC's. I was
>>>>> unsuccessful in finding this list. If one of you could give a link to
>>>>> the
>>>>> post if you wouldn't mind. I'm trying to check up on these;
>>>>> https://www.fairradio.com/catalog.php?mode=viewitem&item=5330
>>>>> They're 'Dearborn 430P'. 3 for $12.00 isn't bad at all if they will
>>>>> work...
>>>>>
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>>>>>
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>>>>
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>
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--
-Ryan Krammer
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