<div dir="ltr"><span style="font-family:arial,sans-serif;font-size:13px">Let me explain...the 4049 and 4050 are CMOS "Buffer" chips..one inverts..the other doesn't. WHY THIS chip? VERY few CMOS device will allow you to pull a input above the supply rail voltage without literally blowing the top off the chip....</span><div style="font-family:arial,sans-serif;font-size:13px">
Stock up now..</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, May 10, 2013 at 11:31 AM, Jim Duuuude <span dir="ltr"><<a href="mailto:telesistant@hotmail.com" target="_blank">telesistant@hotmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div dir="ltr">Just a suggestion in general:<br><br>We are ham radio operators. By definition, we have, at least, a certain basic knowledge of<br>electronics (as is required to pass our test).<br><br>If two devices are somehow electrically incompatible with each other, use your knowledge of<br>
electronics to build a simple circuit to interface them together. Converting from one set of<br>"levels" to another is REALLY not that difficult.<br><br>That's why we are what we are, and do what we do.<br><br>
Jim WB6NIL<br><br>P.S. Or, you can use pin 8 *LIKE EVERY ONE ELSE DOES*!! <br><br><br><br><div><div></div>> From: <a href="mailto:n5zua@earthlink.net" target="_blank">n5zua@earthlink.net</a><br>> To: <a href="mailto:app_rpt-users@ohnosec.org" target="_blank">app_rpt-users@ohnosec.org</a><br>
> Date: Fri, 10 May 2013 16:14:00 -0500<br>> Subject: Re: [App_rpt-users] GM300<div><div class="h5"><br>> <br>> <<a href="http://www.batlabs.com/images/gmacc8.gif" target="_blank">http://www.batlabs.com/images/gmacc8.gif</a>><br>
> <br>> Gotcha. Not sure if you mentioned if yours was a 16 channel or not. If an 8 <br>> channel, the above link lists pin 4 as a spare, and instructs that pin 8 <br>> should be used for COR active low. Since you mentioned getting voltage out <br>
> of pin 4, I'm assuming yours is a 16 channel radio. Folks with an 8 channel <br>> model would not have the option you are using.<br>> <br>> N5ZUA<br>> <br>> ----- Original Message ----- <br>> From: "Bill Hurlock" <<a href="mailto:bill.hurlock@cpcomms.com" target="_blank">bill.hurlock@cpcomms.com</a>><br>
> To: <<a href="mailto:app_rpt-users@ohnosec.org" target="_blank">app_rpt-users@ohnosec.org</a>><br>> Sent: Friday, May 10, 2013 3:54 PM<br>> Subject: Re: [App_rpt-users] App_rpt-users Digest, Vol 51, Issue 9<br>
> <br>> <br>> > Here is a clip about PIN 4 in the Accessory plug of a GM300.<br>> ><br>> > 4 Programmable Output Only This is a radio output port. It is an open <br>> > collector output which saturates to A+ supply when active. It is normally <br>
> > used to drive an external relay or sense lead. It duplicates the function <br>> > of J3-3 of the five pin logic board. When active it can source a maximum <br>> > current of 250 mA.<br>> > The pin has a 10 K ohm resistor pull-down to ground on the logic board. <br>
> > and uses a PNP transistor to switch it up to 12V. This pin does not work <br>> > as an active low pin (i.e. pulling something to ground), only as an active <br>> > high (that is dragging something up to +12v). If you want an active high <br>
> > output to drive a reed relay which has the other side of the coil to <br>> > ground, this is your pin (but don't forget to check that the backwards <br>> > diode is present on the coil pins).<br>
> ><br>> > Bill Hurlock<br>> <br>> _______________________________________________<br>> App_rpt-users mailing list<br>> <a href="mailto:App_rpt-users@ohnosec.org" target="_blank">App_rpt-users@ohnosec.org</a><br>
> <a href="http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users" target="_blank">http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users</a><br></div></div></div> </div></div>
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