RE: [TCML] Q

["Thomas Ryckmans" <thomas.ryckmans@xxxxxxxxxx>]

Interesting circuit... so you tune your coil with both primary+MMC and
secondary+topload present, instead of finding the frequency of the isolated
secondary+top load, then tuning the isolated primary+MMC to the same
frequency. Is that correct?

Many thanks

Thomas

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Antonio Carlos M. de Queiroz
Sent: 30 May 2008 20:30
To: Tesla Coil Mailing List
Subject: Re: [TCML] Q


DC Cox wrote:
> Antonio:
>
> What is the part number for the transistor you used with the 555 circuit?
> Is this a pair of transistors or a single xsistor in a Darlington
> configuration?
>
> Dr. Resonance
>   
The transistors are small BC337 and BC327 transistors. For my coils, the 
primary current with 9 V excitation is in the tens of mA, so any 
transistor is enough. For coils with lower impedance primaries, heavier 
transistors may be needed, or MOSFETs. A more complicated buffer, with 
feedback to lower the impedance, may be used too.
It's interesting to tune a coil with this system. You see immediately 
what is the effect of changing the coupling, the load capacitance (move 
your hand close to the terminal or the secondary coil), etc.

Antonio Carlos M. de Queiroz

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