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Well, if you *really* want old school, how about an Amperite time delay tube??<br><br>If it was good enough for Collins and the like, it should be good enough for ham radio :-).<br><br>JIM WB6NIL<br><br><div><div id="SkyDrivePlaceholder"></div>> Date: Fri, 27 Jan 2012 15:41:32 +0900<br>> From: a.errington@lancaster.ac.uk<br>> To: yokshs@gmail.com<br>> CC: app_rpt-users@ohnosec.org<br>> Subject: Re: [App_rpt-users] GPIO fan control<br>> <br>> On Fri, January 27, 2012 12:43, K&R Yoksh wrote:<br>> > I forgot to mention that I've also had good luck assigning multiple<br>> > Parallel<br>> > port pins to PTT in usbradio.conf or simpleusb.conf, such as:<br>> ><br>> > pp3 = ptt pp4 = ptt<br>> ><br>> > Again, I'd rather not cycle a relay with every PTT. I'd much prefer the<br>> > fan run for 2 minutes or so after the last PTT, then shut off. That would<br>> > save a lot of wear and tear on the fan and relay.<br>> <br>> How about a 555 timer IC hooked up to PTT in one-shot mode with a 2 minute<br>> timer?<br>> <br>> Very old skool, but might do the job.<br>> <br>> 73,<br>> <br>> Andrew<br>> ZL3AME<br>> <br>> _______________________________________________<br>> App_rpt-users mailing list<br>> App_rpt-users@ohnosec.org<br>> http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users<br></div> </div></body>
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