Telrad flasher schematic

I have looked for the article "A Pulsating Telrad Finder" on S&T 's site. But they only have the citation for it: John A Nevelus; Sky & Telescope; Dec 1988; 694; not the actual article.

Can anyone tell me what circuit was described? Send me a schematic?

Many thanks.

Hi Ken,

Chances are it was based on the CMOS version of the 555 timer IC chip.

Here is a link to the operation:

http://www.eleinmec.com/article.asp?3

It is a bit technical, but the equations are there to determine the pulsing rate you might want. The Telrad LED would hook up to the output pin 3 of the IC through the dimming resistor on the Telrad.

Ken Landaiche said:Can anyone tell me what circuit was described? Send me a schematic?

Ken: The attached schematic may help you.

Attached Image:

Why not just buy a pulser kit like the ones Astrosystems and Scopestuff sell for $20? Mine works great. Of course, I understand that some folks just like to build their own.