Re: TSG instability

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "marc metlicka by way of Terry Fritz <twftesla-at-qwest-dot-net>" <mystuffs-at-orwell-dot-net>




> 
> I once tried to make an ignition coil driver controlled by a monostable
> circuit, so that I could produce just one spark, at a time controlled
> by an external signal. This is the same case of a TSG.
> I observed that the spark of the ignition coil (not to mention the spark
> of a triggered Tesla coil soon after) was causing strong interference,
> that could easily trigger again the monostable. The result was a series
> of sparks instead of just one.
> The solution was to add another monostable, triggered by the fall of the
> first one, and wired so that during its pulse the first monostable could
> not be triggered in any way. With the pulse of this second monostable
> lasting for more time than the operation cycle of the ignition coil, and
> of the triggered circuit, the driver was kept inactive and insensitive
> to interference.
> I didn't use ICs in the circuit, but I'm sure that two 555s can be wired
> in the same way.


Could you explain this circuit?

> 
> Antonio Carlos M. de Queiroz