<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div style="-webkit-text-size-adjust: auto; ">Try this page (no pun intended)</div><div style="-webkit-text-size-adjust: auto; "><br></div><div style="-webkit-text-size-adjust: auto; ">You need an NPN transistor and a diode:</div><div style="-webkit-text-size-adjust: auto; "><br></div><div style="-webkit-text-size-adjust: auto; "><span style="font-family: '.HelveticaNeueUI'; font-size: 15px; line-height: 19px; white-space: nowrap; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.296875); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469); -webkit-text-size-adjust: none; "><a href="http://m.dummies.com/how-to/content/electronics-components-use-a-transistor-as-a-switc.html">http://m.dummies.com/how-to/content/electronics-components-use-a-transistor-as-a-switc.html</a></span></div><div><font face=".HelveticaNeueUI"><span style="font-size: 15px; line-height: 19px; white-space: nowrap; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.292969); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469);"><br></span></font><br><span style="-webkit-text-size-adjust: auto;">Sent from my iPhone</span></div><div style="-webkit-text-size-adjust: auto; "><br>On Jun 25, 2013, at 10:08 AM, James Hill <<a href="mailto:g0fhmuk@gmail.com">g0fhmuk@gmail.com</a>> wrote:<br><br></div><blockquote type="cite" style="-webkit-text-size-adjust: auto; "><div><div dir="ltr"><div><div><div><div><div><div>Guys,<br><br></div>I'm trying to get COR sorted via the Parallell port.<br><br></div>I've figured out I need to ground pin 15 in order to turn RX on and off.<br><br></div>
The problem is, I have a +5V signal from my radio when there is a carrier present.<br><br></div>Can anybody point me toward an easy circuit to be able to convert the +5V to a negative in order to turn the RX on and off? If I set ppinvert, it turns the RX on when I ground the pin - so that seems to be the way to go.<br>
<br></div>I've tried googling, but all sorts of stuff comes up!<br><br></div>Thanks,<br><br>James<br></div>
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