T&L Publications

Here's my circuit. I was going to resize everything (bigger cap, smaller divider) so I could use a cheaper pot that the 2 meg one I would need with this.<p> http://www.homefires.us/bluemarble/PAGES/HALLOWEEN/UVSTROBE.jpg <p> UV LED strobe <p>Other comments welcomed.<p>Todd Snyder N9AOK

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by Chris Foley: The brief answer to your question is, try the 1N5817 schottky rectifier diode if you're worried about voltage drop. <p>I'll check that diode out. Your basic problem...

Chris, Actually, I've decided to use a lm317 now to keep a steady voltage for my circuit. I'll be pulling pulses of up to 500ma at times.<p>So, now I guess the question is will the 317 handle reverse 10V for short times and if not then can the schottky diode you describe handle those kind of current...

I just hate to loose that 0.7volts since this is running off a 9V battery and as it drops voltage through out its life it will just end circuit functionality that much sooner.<p>My worries are only about inadvertant touching of the 9v battery backwards on there.<p>Thanks for you help....I think I ma...

Can a 555 timer take 10V reverse on its power/Grnd pins?<p>I'm building something and need to know if I have to include a protection diode?<p>I cant tell from the data sheet but it looks like it will be OK as long as the transistors inside can take it.<p>thanks for any help Todd Snyder

Grant, did you use the circuit on page 15 of the PDF?<p>Todd

Grant, I tried the same thing with a 4amp rated transformer and could only get about 1.5amps out before its voltage dropped too low. <p>I assume you tapped your feedback from the base of your drive transistor? I made the mistake of trying to feedback from the output of the drive tansistor...the 317 ...