Re: [TCML] Looking for a 1.8nF 50V (Polypropylene 2%) Cap

[Brandon Hendershot <brandonhendershot@xxxxxxxxx>]

Hi Gary,

Thanks for the info. Sometimes I get a bit too strict on adhering specifically to the specifications on finicky projects like these. Especially with my history with 555 timers I'll keep scrounging around and see what I can't find.
Oh, nearly forgot, I managed to grab a TLC555 instead of a LMC555, is there any difference? The part numbers match up, but I'm still unsure...

Thank You,
Brandon

On Mar 6, 2011, at 9:47 AM, Gary Lau <glau1024@xxxxxxxxx> wrote:

> Hi Brandon,
> 
> There's nothing sacred about the 1.8nF value.   IF you were planning on
> using the frequency dial image that Terry provided, it would be a good idea
> to use exactly the same components that Terry did, but even then, I would
> recommend doing your own dial calibration with a frequency counter, since
> audio pot's are not typically high-precision devices.  My 10K pot measures
> 9.38K.
> 
> Otherwise, you can use anything remotely close.  For the cap. I used a
> 1600pF 5% mica cap.  No reason you couldn't series-parallel whatever you
> have in your junk box to achieve something close.  For the bi-color LED, I
> just used two red LED's back-to-back.  Probably the only really important
> thing is that the cap be temperature-stable, not ceramic.
> 
> Regards, Gary Lau
> MA, USA
> 
> On Sat, Mar 5, 2011 at 10:58 PM, Brandon Hendershot <
> brandonhendershot@xxxxxxxxx> wrote:
> 
>> Hi Everyone,
>> 
>> I'm working on a copy of Terry's Tesla Coil Tuner
>> (capturedlightning.org/hot-streamer/TeslaCoils/Misc/TCT/TCT.htm) and
>> there's this capacitor in the parts list (1.8nF 50V Polypropylene 2%)
>> and I can't find anyone NOT selling them in bulk... So, I imagine
>> somebody else had the same problem and actually bought some, lol. Do
>> we have any of those folks here that are willing to sell me an extra
>> cap?
>> That, or does anybody know of some mysterious vender hiding in the
>> deep dark depths of the internet that's selling them to the general
>> population? Anything will do really, just as long as I don't have to
>> go buy a hundred just to use the one and turn around and try to resell
>> the others, lol.
>> 
>> Thanks List,
>> Brandon (H. in case the other Brandon decides to chime in :))
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