[GreenKeys] Ring generator.

[Jon Schlegel]

Kurt,

I once did a design for solid state replacement for a mechanical 
vibrator.  It used a 555 as you suggest and a pair of MOSFETs to 
provide alternating contact closures.  It went into existing 
equipment that generated the higher voltage ring current and don't 
recall the details of that circuitry.  Sam's 100V line transformer 
sounds like a good plan though.  Maybe even a filament transformer.

Regards,
Jon WA3MVM


At 12:31 AM 2/18/2009 -0800, KD7JYK DM09 wrote:
>Has anyone ever experimented with a chip, for example, a 555 or basic stamp,
>providing the proper Hz, then kicked up through a transformer, to activate
>equipment looking for a "ring" signal?
>
>Kurt
>
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