Thanks Tony, So no special curcuit needed, just drop the voltage with capacitor or resistors and a bridge. Dwight
________________________________ From: Tony Duell via cctalk <cctalk@classiccmp.org> Sent: Friday, November 8, 2024 8:53 AM To: General Discussion: On-Topic and Off-Topic Posts <cctalk@classiccmp.org> Cc: Tony Duell <ard.p850...@gmail.com> Subject: [cctalk] Re: mains stroboscope / was Re: Running DOS executables on other versions of DOSRe: Looking for Sharp PC-5000 disk drive (CE-510F or possibly MZ-80B) On Fri, Nov 8, 2024 at 2:56 PM ben via cctalk <cctalk@classiccmp.org> wrote: > > On 2024-11-06 12:28 p.m., Brent Hilpert via cctalk wrote: > > The old common standard for a mains stroboscope was a neon bulb (+resistor). > > They are still widely available, simple and inexpensive. > > No, they are not very bright and need some shading or otherwise reduced > > ambient light, but for a tool of infrequent use... > > > If it works why change it? > Don't modern leds use a still glow after being turned off? Quite possibly white ones do. But thenso do fluorescent lamps which were often recomended as a mains strobe light source 40 years ago. But having used white LEDs to make a stroboscope flashing 100 or 120 times a second, I will assure you there's enough change in intensity between 'on' and 'off'' to give a very clear pattern of the strobe markings even with normal room illumination also on. -tony
