Hi Paul

 That schematic I sent you had a huge error.

 I only noticed it when I tried your suggestion.

 The scope shows both traces on one screen "red" for the what I labeled
 "trigger conditioned" and "blue" for the "injector" so all I had done
was
 copied the same screen either side of the schematic with a different
label.

 So really all the injector got was a flat zero volts.

 Call me dumb or what.  Anyway I learnt a bit more so not all bad.

 I still could do with some help what is the 1N2004?????????????????
 I have tried web searches and all I come up with that it's obsolete,
 Digikey that I thing you said you use comes back "No records match your
 search criteria" so what am I missing?????

 Clive C


 The message is ready to be sent with the following file or link
attachments:

 555 DWG5.pdf

 It is a 1 amp diode. Could very well be obsolete as I have a couple
 hundred lying around :) Convert those pdf's to jpgs. The pdfs are too
big
 to send. One way is use the screen capture trick. Paste into MS Paint
 and save as jpg.

 Paul Lamar



Try the 1N400x series.  1N4001 50V thru 1N4007 1000V, all 1A.

Bob W.

Digikey and Newark both have the 1n4004...as does Radio Shack (if you
want to spend the BIG bucks for them).  They are between 2 and 4 cents
each at the first two, and 99 cents at the Shack.

Bob was right though...any ol' 1n400x series you have laying around, or
can find, will do.  Any electronics repair shop will have them by the
hundreds.

Harley