Jim, That is interesting.
The 4011 is a quad 2-input NOR gate. It is meant for logic and is definitely not a diff-amp and is definitely not a standard op-amp approach. However, some might use a device out of spec of the manufacture which is a sign of poor design practices. A manufacture might make the device one way today and change to a totally different approach later. It would still meet the manufactures published specs and do as he says, but operate differently for other out of spec applications. I would always use a device for what it was meant for. For this audio application there are many devices that would do the same and be in spec to a manufactures spec. If it does work for you it is hard to say don't do it, hi. 73, ron, n9ee/r >From: Jim Brown <[EMAIL PROTECTED]> >Date: 2007/11/25 Sun PM 10:24:58 CST >To: [email protected] >Subject: Re: Re: [Repeater-Builder] 2x RX's or 2x TX's on one Controller Port > >Not so Ron. Give it a try - you might be surprised. >I have been using the 4011 CMOS logic in audio >circuits for 30 years and have not been disapointed in >the audio quality in any of the circuits I have used >them in. That feedback resistor from the output to >one of the inputs converts it to a standard OP-AMP >circuit and biases the gate into a linear area of >operation. > >73 - Jim W5ZIT > >--- Ron Wright <[EMAIL PROTECTED]> wrote: > >> Although many logic, including NAND gates, operate >> in linear mode, but not for audio. They simply >> switch from/to logic 0 or 1. >> 73, ron, n9ee/r >> > >__________________________________________________________ >Be a better pen pal. >Text or chat with friends inside Yahoo! Mail. See how. >http://overview.mail.yahoo.com/ > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
