Re: Updated website

Wanye,

Here's what the diodes do. Let's say the "upper left" and "lower
right" transistors are on, the current in the coil builds up and the
direction of current will be left to right. The coil has inductance
and inductance does not like current to change abruptly.

Now the previously on transistors turn off and the opposite pair turn
on (lower left and upper right). The current direction in the coil
will still be left to right. Here's where things get interesting.

That condition would require current to flow out of the "lower left"
collector and into the emitter of the "upper right" transistors. You
can't do that. Because you can't, it would rupture both transistors;
the coil inductance would generate whatever voltage it took to do
that.

This is where the diodes come in. They provide the path for this
current to flow while it decays. The transistors don't carry any
current until the coil decays to zero current. Then the direction of
current can reverse and build in the opposite direction, now supplied
by the transistors again.

Mariss

--- In CAD_CAM_EDM_DRO@y..., "waynegramlich" <Yahoo@G...> wrote:
>snip
>
> Lastly, I can't figure out what condition the diodes
> D2-D9 are trying to protect against.
> [snip rest of message]
>
> -Wayne