Re: [CAD_CAM_EDM_DRO] Re: 555 timer circuit

Hi Gizmo,

Too bad we don't have easy access to these magazines (these articles
specifically) here in the MIDDLE of the pond! It would be nice to see
what you guys "down under" are up to! Have you built one? do you have
a URL to the company that makes the kit?

Alan KM6VV


gizmomaker@... wrote:

>
> Australian electronic magazines have published several projects to
> step motors manually.
>
> Silicon Chip June 1997 even uses a 555.
> Silicon Chip June 1998 uses a few cmos chips 4510, 4017 etc.
>
> The controls are:
> Speed pot, Direction, Stop/run, Mode- Continuous/preset, and a 2 bank
> thumbwheel Preset switch of how many steps to move. There is a
> selection of 1.8 and 7.5 degree type motor presets and I have added a
> 2 degree preset to my version.
>
> Kits are available at maybe US $20. Does not include the case and
> power transformer, which you would have to use a 110vac version
> anyway.
>
> The main problem is the slightly small output transistors BD680/681.
> I have fed this front end into my main axis driver modules via a
> "Computer/manual" switch.
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the discussion of shop built systems, for CAD, CAM, EDM, and DRO.