Re: AW: [EVGRAY] Re: Mystery machine

Body

Kone, this is very good to know.  Yes Ole dissected the question very
well as usual.

I like to think of circuits as sink or source being the direction of
current is either supply or load.  Tends to make more sense when I think
this way and also consider impedance to the flow direction.  A mosfet in
a single ended configuration will supply music which is AC but will only
shut off in one direction so will not sink the current symmetrically.  A
good reason to operate them push pull.

However when dealing with music production air is asymmetric as
unlimited pressure can be created but vacuum is the limit of the
rarefaction side.


On 6/10/2018 1:43 AM, [email protected] [EVGRAY] wrote:
>  
>
> Hi Ole
>
> Also it is good practice to put a very fast suitable diode over each
> of the back to back mosfets, stretching from the source, going to the
> drain.
>
> If no diode there on each mosfet then the back to back diodes will
> tend to turn on "individually" rather than allowing AC flow to flow
> freely through the back to back bidirectionally connected diodes.
>
> This with peak coil shorting is important as during the switch closure
> is when the hyper AC ringing occurs and to keep it sustaining when
> switch is closed you need those diodes from source to drain.
>
> Kone
>
>