Right Ken, You're question of WHY would anyone use a chip when a transistor an one or two resistors would do is a good one. the only answer that I can think of is that the person using it doesn't know how to do it with transistors. Actually with a EXEC II and MVP (and likely the MASTR II) you don't even need the transistor in the base because they have a 10K to +10v that is floating when the radio is unsquelched and pulled to ground with a NPN when it is squelched.
73 AC0Y --- In [email protected], Ken Arck <[EMAIL PROTECTED]> wrote: > > The IC you speak of is a standard, run-of-the-mill CD4049 CMOS hex inverter > and the 4050 is a standard CMOS hex NON-inverting buffer. The TCP prefix > just means they're made in Japan :-) > > Both of these ICs have been around for 30+ years and is fairly "old" > technology. But what the heck, they work fine! > > Then again, why use a whole 14 pin dip package device when a single NPN > transistor and 2 resistors will do the same thing? (ok, in the case of the > 4050, it takes 2 transistors!) > > Ken > > At 12:22 PM 12/31/2005 -0800, you wrote: > >>>> > Has anyone used the TC4049BP hex buffer converter chip as an alternative to > open collector NPN transistor COR inverters. I'm curious because we use > such a chip with our RLC-4 controller and it works flawlessly. This chip > has 6 input/outputs with a reference common voltage. There is another chip > which is a buffer and it is ideal when the COR voltage requirement is > higher than can be supplied by the radio COR circuit. The chip number is > TC4050BP. Of course a TC4049BP can be used as a buffer by hooking up 2 > input ouputs in series. Here is the pinout: Pin 1 ref voltage up to > 20Vcc. Pin 8 Ground ref. Pin 3 input / pin 2 output. Pin 5 input / pin 4 > output. Pin 7 input / pin 6 output. Pin 9 input / pin 10 output. Pin 11 > input / pin 12 output. Pin 14 input / pin 15 output. Pin 13 and 16 no > connection. Happy new year everyone. > Bruno VE2VK/KD1XG. > VE2RVK voting repeater system. > 146.865mhz- 141.3hz. > > > > ---------------- > Yahoo! for Good - > <http://us.rd.yahoo.com/mail_us/taglines/charity/*http://brand.yahoo. com/cyb > ergivingweek2005/>Make a difference this year. > > > > > > > > ---------------- > YAHOO! GROUPS LINKS > > * Visit your group > "<http://groups.yahoo.com/group/Repeater-Builder>Repeater-Builder" on the web. > > * To unsubscribe from this group, send an email to: > > <mailto:[EMAIL PROTECTED] subject=Unsubscribe>Rep > [EMAIL PROTECTED] > > * Your use of Yahoo! Groups is subject to the > <http://docs.yahoo.com/info/terms/>Yahoo! Terms of Service. > > > ---------------- > > > > > > ------------------------------------------------------------------- ----------- > President and CTO - Arcom Communications > Makers of state-of-the-art repeater controllers and accessories. > http://www.ah6le.net/arcom/index.html > We offer complete Kenwood TKR repeater packages! > We are now an authorized Telewave Dealer! > AH6LE/R - IRLP Node 3000 > http://www.irlp.net > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
