Re: good scopes for coiling

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>

On 18 May 2005, at 9:58, Tesla list wrote:

> Original poster: "Paul B. Brodie" <pbbrodie@xxxxxxxxxxxxx>
>
> Hi,
> Terry has the plans for the Tesla Coil Tuner that I think basically
> does what Malcolm has described here. Karl Lindheimer posted a note
> earlier about using the TCT with the URL. I will repeat it. The
> schematic and directions are located here:
>
> http://hot-streamer.com/TeslaCoils/Misc/TCT/TCT.htm
>
> It is a 555 oscillator with a bi-directional LED. I downloaded the
> plans and directions and just happen to have all of the parts in my
> junk bin, except for the 10K audio taper pot with switch. I plan to
> get one of these at Radio Shack tomorrow. One thing I was
> contemplating doing differently is use a micro-ammeter I have on hand
> instead of the LED. Won't this give a better indication in place of
> trying to judge the brightness of an LED?? Is this so, or am I missing
> something? Maybe I can use the LED and the meter? What do you think?
> If I keep getting sidetracked with these projects, I'll never complete
> my TC! ô¿ô Paul Think Positive

I assume you will have some form of HF rectification to drive the
meter?

Malcolm

> ----- Original Message -----
> From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Tuesday, May 17, 2005 6:43 PM
> Subject: Re: good scopes for coiling
>
> Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>
>
> On 17 May 2005, at 11:45, Tesla list wrote:
>
>   > Original poster: "Mercurus2000" <mercurus2000@xxxxxxx>
>   >
>   > So there is no electronic way of measuring the resonance of a >
>   secondary without complicated or expensive electronics? -----
>   Original > Message ----- From: "Tesla list" <tesla@xxxxxxxxxx> To: >
>   <tesla@xxxxxxxxxx> Sent: Sunday, May 15, 2005 3:59 PM Subject: Re: >
>   good scopes for coiling
>
> I'm sure a way can be devised that doesn't require use of an
> oscilloscope and sniffer probe although that is probably the best
> option. Connecting a signal generator which can supply some current (a
> buffered 555 e.g.) to the secondary base in series with a resistor
> would allow monitoring of current through the resistor with a LED in
> parallel by sensing the voltage across it. That will interfere to a
> far lesser degree with correct operation of the secondary. I see no
> reason why it shouldn't work although you can probably expect several
> lesser peaks besides the fundamental. In my experience, monitoring
> base current and finding the peak doesn't coincide exactly with
> maximum Vs although it gets close.
>
> Malcolm
>
>   > Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>
>   >
>   > On 13 May 2005, at 23:02, Tesla list wrote:
>   >
>   >   > Original poster: "Mercurus2000" <mercurus2000@xxxxxxx>
>   >   >
>   >   > Couldn't you take like you said a 555 timer, connect the
>   pulsing > >   squarewave output to a TC secondary, then connect a
>   diode to the > >   topload and connect a digital voltmeter to the
>   diode and get a idea >   of > the resonant frequency? Adam -----
>   Original Message ----- From: >   "Tesla > list" <tesla@xxxxxxxxxx>
>   To: <tesla@xxxxxxxxxx> Sent: >   Friday, May 13, > 2005 10:49 AM
>   Subject: Re: good scopes for coiling > > In a word, no, not if you
>   are after accuracy. Anything you connect > directly to the secondary
>   is going to boost its puny capacitance out > of sight. > > Malcolm >
>   >   > >   > Original poster: Karl Lindheimer <karl@xxxxxxxxxxxxxxx>
>   >   > >   > Hi Keith, >   > >   > A scope and/or frequency generator
>   can be quite helpful in Tesla >   Coil > duty, and for just about
>   any other project that will come >   along. > Since I am on a low
>   "fixed budget" as it were, I built a >   555 timer > waveform
>   generator for about $8.00 total.  I used an >   inexpensive >
>   multi-meter for several years before snagging a >   Tektronics 265B
>   scope > for under $100 on Ebay.  This scope is the >   best addition
>   to my test > bench in many years, and continues to >   impress.  My
>   Tek scope is rugged > and parts are still obtainable >   from junked
>   scopes. > > Hope that the above helps, > > Karl > > On >   May 12,
>   2005, at 10:32 PM, Tesla list wrote: > >  >Original poster: >
>   "keith" <keith.cc@xxxxxxxxxxx> >  > >  >I'm looking to buy a scope >
>     and/or frequency generator for coiling >  and >general use, but I
>   >   don't really have any idea about >  manufacturers/models >etc ­
>   what >   are some good ones to look for? I've >  read that the older
>   tube >   >scopes are better than modern solid state >  ones for the
>   stressful >   >environments generally encountered in high >  voltage
>   work, and >   given that >I'm still new to coiling/hv devices, >
>   something that >   has a good chance of >surviving a few careless >
>   errors/poorly >   designed experiments would be good. >Relatively
>   low >  cost would >   also be nice. Thanks. > >Keith C > > > > > >
>
>
>