Re: 555 timer circuit

Hi,

I have followed this thread with interest and I thought it would be
fun to draw up some circuits to do what was talked about. What I came
up with is:

1) Simple. A circuit that uses a SPDT, center-off switch. When
depressed it generates a single CW or CCW step pulse. 2 seconds later
it outputs a non-accelerated step pulse train at a speed of your
choice until the switch is released. Uses a single 4093 IC and a few
R's and C's.

2) Medium. Same as above but generates an accelerating step pulse
train of your choice of accel rate and terminal velocity. Releasing
the switch then decels at same rate until motor stops. 2 to 3 generic
ICs and of course some R's and C's.

I can post it to the files section after I convert paper/pencil stuff
to a .pdf if anyone wants.

Mariss

--- In CAD_CAM_EDM_DRO@y..., wanliker@a... wrote:
> I have not used it yet, but it can be used for moving any axis it
is hooked
> too, or make three. Or for the guy that does not want full CNC, he
can just
> use a stepper and let it do the cranking from one end to the
other.
> Automatic but wholly under visual control. and with the single
step, and a
> DRO could do a lot of stuff easily, just setting there watching. I
think it
> would be rather easy to add your accel/deccl circuit, tied in with
a switch
> so selectable, If you are repeating a cut then use it, or not your
choice,
> same as high/low speed, or single step. I would consider using a
ten turn
> pot for the speed control.
> OK, so I need new glasses. But the numbers look like NE555 to me.
I ignored
> the top half of the circuit, I have found in the last 40 years that
a lot of
> circuits can be taken out of context and work elsewhere with few
problems,
> just consider them black boxes, I don't know enough about designing
to do it
> from scratch.